CN105954564B

CN105954564B - A kind of device and method that conductor current is measured using magneto-optic memory technique

Info

Publication number: CN105954564B
Application number: CN201610338622.4A
Authority: CN
Inventors: 杨丽君; 刘再旺; 尉长江; 姚晓天; 钦明亮
Original assignee: BEIJING GAOGUANG TECHNOLOGY Co Ltd; Hebei University
Current assignee: BEIJING GAOGUANG TECHNOLOGY Co Ltd; Hebei University
Priority date: 2016-05-19
Filing date: 2016-05-19
Publication date: 2018-06-22
Anticipated expiration: 2036-05-19
Also published as: CN105954564A

Abstract

The present invention provides a kind of device and methods that conductor current is measured using magneto-optic memory technique.The present invention is by setting three magneto-optic memory techniques to be used as sensing head, when measuring conductor current, ensures that the relative position of three magneto-optic memory techniques immobilizes.When these three magneto-optic memory techniques are in the magnetic field that electrical conductor formed, in three magneto-optic memory techniques by polarised light all polarization direction can be made to deflect due to Faraday effect；By measuring the three beams polarised light deflection angle that the polarization direction of each polarised light is occurred after three magneto-optic memory techniques, the electric current in conductor can be calculated with reference to the fixed angle between thang-kng optical path direction in three magneto-optic memory techniques and relative distance.Using the present invention measure conductor current when, three magneto-optic memory techniques are insensitive as setting angle, a mounting distance between entirety and conductor, can eliminate in the prior art due to the uncertainty of installation site between magneto-optic memory technique and conductor caused by measurement error.

Description

A kind of device and method that conductor current is measured using magneto-optic memory technique

Technical field

The present invention relates to current measurement techniques field, specifically a kind of dress that conductor current is measured using magneto-optic memory technique It puts and method.

Background technology

Current measurement, especially Super-Current Measurement are electric system, electric power system and large-scale manufacturing enterprise in electric power safeguard One important process of aspect.The field is generally using electromagnetic type measurement of mutual inductance mode, the measurement skill of this mode at present Art is highly developed, but there is some it is serious the shortcomings that：First, equipment is heavy (because there are line packet and iron cores)；2nd, in mutual inductance It consumes energy in journey high；3rd, overheat in order to prevent, need equipment heating part being immersed in oil, bring great public safety and The hidden danger of normal life order.

In recent years, current measurement was carried out using optical sensing to be paid more and more attention.Mainstream technology is to utilize farad at present Magneto-optic effect.Electric current is surveyed using Faraday magnetooptical effect to be divided into as two classes, one kind is to be looped around current conductor using optical fiber Around, by measuring the magnetic induction intensity of electric current generation, so as to fulfill the measurement of electric current；Another kind of is to use magneto-optic memory technique, will Magneto-optic memory technique is placed near conductor, and the magnetic field that electrical conductor generates can change the polarization state of the light by magneto-optic memory technique, pass through survey The polarization state of light is measured with the situation of change in magnetic field, realizes the current measurement to conductor.

As shown in Figure 1, Fig. 1 is the schematic diagram that conductor current is measured using magneto-optic memory technique.When a branch of polarised light passes through one During magneto-optic memory technique in magnetic field, polarization direction is changed due to Faraday magnetooptical effect, long in magneto-optic memory technique In the case that degree is certain, the angle beta of change of polarized direction increases with the increase of magnetic induction density B.And there is electric current in the conductor By when, will be generated on conductor periphery with the increase of electric current and increased magnetic field, utilize Fig. 1 length be D magneto-optic Material, the deflection angle generated by measuring polarised light due to changes of magnetic field, so as to calculate the current strength in conductor.

Magneto-optic memory technique is being used to measure in the system of conductor current, magneto-optic memory technique typically will as a kind of sensor information It is placed on conductor nearby or is close to conductor, so as to fulfill current measurement.As shown in Fig. 2, shown in Fig. 2 magneto-optic memory technique, The side view (Fig. 2 (a)) of conductor, light input and light output path (light input and light output path is realized using optical fiber) etc. And end-view (Fig. 2 (b)).

The system schematic that conductor current is measured using magneto-optic memory technique generally used at present is as shown in Figure 3.Wherein light source Light beam is generated, polarised light is become by a polarizer, then by being placed on current conductor (is conductor cross-sectional shown in figure Face) neighbouring magneto-optic memory technique, due to the effect of current field, it is inclined that magneto-optic memory technique so that the polarization direction of the polarised light passed through occurs Turn, be exactly an inconsistent polarised light of the polarization light polarization direction inputted with before in the light of other end output.This output Polarised light again by an analyzer (or be polarizer, the polarization direction of this analyzer is known, such as with front The polarization direction of the polarizer is consistent)；It will at this time be weakened by the light intensity of analyzer, because the polarization direction of light has occurred Deflection, being only parallel to the polarized light component of analyzer polarization axis direction can pass through.And the bigger periphery magnetic field of electric current is stronger, Magneto-optic memory technique to by polarization light polarization direction deflection it is bigger, magnetic (is selected by the light intensity of analyzer here with regard to smaller The deflection angle that luminescent material makes polarization light polarization direction deflect is no more than 45 °).Analyzer is received using an optical detector Output light, and an electric signal is generated, it is compared, calculated by a signal processing circuit and light source output light light intensity Measure the current strength in current conductor.

Fig. 4 is the improved system schematic that conductor current is measured using magneto-optic memory technique on the basis of Fig. 3, and wherein light source is sent out The light gone out enters magneto-optic memory technique after the polarizer becomes polarised light, under the magnetic fields generated in conductor current, passes through magnetic The polarization direction of the polarised light of luminescent material deflects, and later into a polarization beam apparatus, is beamed into two beam polarization directions Orthogonal polarised light.By measuring the light intensity of this two beams polarised light and being compared, you can calculate magneto-optic memory technique to light Degree of deflection, so as to calculate current strength.Such as a polarization axle a of polarization beam apparatus and the polarization direction of the polarizer Unanimously, then receive by magneto-optic memory technique it is affected by magnetic fields deflect polarised light when, with the enhancing in magnetic field, lead to Crossing the luminous intensity of polarization axle a will reduce, and will be enhanced by the light intensity of another polarization axle of polarization beam apparatus b.Shown in Fig. 4 System compared with Fig. 3 difference lies in, it is only necessary to compare the light intensity magnitudes of two output lights of polarization beam apparatus and can measure electric current, And most importantly optical attenuation is not influenced this system in by light source output-power fluctuation and transmission process.

But during magneto-optic memory technique is placed, usual magneto-optic memory technique has uncertainty relative to the position of conductor.Position It puts and does not know to include two kinds of situations, one kind is that the distance between magneto-optic memory technique and measured conductor are uncertain；Another kind is magneto-optic material Expect not knowing the angle between measured conductor, it may also be said to be current direction in optical direction and measured conductor in magneto-optic memory technique Between angle do not know.It causes apart from uncertainty to have between magneto-optic memory technique and measured conductor：Measured conductor is different The outsourcing insulation of thickness；Since mounting condition limits, conductor can not be close to by measuring the probe of electric current；It can not in actual use Mechanical shock avoided etc..Magneto-optic memory technique is to measure electric current by experiencing conductor periphery magnetic induction intensity, and conductor periphery Magnetic field, be to be changed with the distance apart from conductor, nearer apart from conductor, magnetic induction intensity is bigger, is got over apart from conductor Far, magnetic induction intensity is smaller.Such case is just to measure conductor current using magneto-optic memory technique to bring inconvenience, can be because of magneto-optic material Expect the minor change of distance between conductor and generate measurement error.Angle between magneto-optic memory technique and measured conductor is caused not know The reason of have：The smooth setting angle for not being fixed easily magneto-optic memory technique of outsourcing insulation of measured conductor；Since mounting condition limits, Angle can not be remained fixed with conductor by measuring the probe of electric current；Inevitable mechanical shock etc. in actual use.In conductor Angle between current direction and optical direction in magneto-optic memory technique is different, and magneto-optic memory technique can be caused different to the susceptibility in magnetic field； When optical direction is vertical with current direction in conductor in magneto-optic memory technique, the magnetic field induction that magneto-optic memory technique generates electric current is most quick Sense, the angle deviating upright position in magneto-optic memory technique in optical direction and conductor between current direction is more, magneto-optic memory technique sensing The variation in magnetic field is smaller.Such case is similarly brings inconvenience using magneto-optic memory technique measurement conductor current, can be because of magneto-optic material Expect the minor change of angle between conductor and generate measurement error.Therefore, distance and angle between magneto-optic memory technique and conductor Uncertainty is one of most important source that conductor current formation measurement error is measured using non-circular magneto-optic memory technique.

Invention content

An object of the present invention is just to provide a kind of method that conductor current is measured using magneto-optic memory technique, and this method can The electric current of conductor is accurately measured in the case that distance and angle are unrestricted between magneto-optic memory technique and measured conductor.

The second object of the present invention is just to provide a kind of device that conductor current is measured using magneto-optic memory technique, using the device Conductor current is measured, can be eliminated simultaneously in the prior art due to the uncertainty and angle of distance between magneto-optic memory technique and conductor It is uncertain and caused by measurement error.

What an object of the present invention was realized in：A kind of method that conductor current is measured using magneto-optic memory technique, including Following steps：

A, the first magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic memory technique is made to distinguish counter conductor and place, and three The relative position of magneto-optic memory technique immobilizes；First magneto-optic memory technique is parallel with the second magneto-optic memory technique, but with third magneto-optic memory technique not It is parallel；Distance of first magneto-optic memory technique away from conductor is less than distance of second magneto-optic memory technique away from conductor, and third magneto-optic memory technique is away from conductor Distance it is equal with distance of first magneto-optic memory technique away from conductor or equal with distance of second magneto-optic memory technique away from conductor；

B, light source is set；The light that light source is sent out is made to be changed into three beams polarised light, respectively the first polarised light, the second polarised light With third polarised light；The first polarised light is made to pass through the first magneto-optic memory technique, the second polarised light is made to pass through the second magneto-optic memory technique, makes third Polarised light thang-kng third magneto-optic memory technique；

C, the first deflection angle β that the first polarised light is deflected by light beam polarization direction after the first magneto-optic memory technique is measured₁, Measure the second deflection angle β that the second polarised light is deflected by light beam polarization direction after the second magneto-optic memory technique₂, it is inclined to measure third Shake the third deflection angle β that light is deflected by light beam polarization direction after third magneto-optic memory technique₃；

D, the electric current in conductor is calculated according to three deflection angles.

The present invention is by setting three magneto-optic memory techniques (being, for example, magneto-optical crystal or magneto-optic glass etc.) staggered relatively come same Shi Zuowei current sense devices during measuring conductor current, ensure that the relative position of three magneto-optic memory techniques between any two is fixed It is constant, and the first magneto-optic memory technique is parallel with the second magneto-optic memory technique, but distance of the two away from conductor is different；Third magneto-optic memory technique and One magneto-optic memory technique and the second magneto-optic memory technique are not parallel, but distance of the third magneto-optic memory technique away from conductor and the first magneto-optic memory technique are away from leading The distance of body is equal or equal with distance of second magneto-optic memory technique away from conductor.A branch of polarization is passed through in each magneto-optic memory technique Light, due to Faraday effect, polarised light is deflected by magneto-optic memory technique rear polarizer direction, the angle of change of polarized direction It is proportional to magnetic induction intensity.Since the distance of both the first magneto-optic memory technique and the second magneto-optic memory technique away from conductor is different, two Magnetic induction intensity at magneto-optic memory technique is different, therefore two beam polarised lights pass through the first magneto-optic memory technique and the second magneto-optic memory technique rear polarizer side It is different to the angle of change.Since third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique are not parallel, i.e. third Optical direction is different from optical direction in the first magneto-optic memory technique and the second magneto-optic memory technique in magneto-optic memory technique, therefore third magneto-optic memory technique The magnetic induction intensity at place and the magnetic induction intensity at the first magneto-optic memory technique and the second magneto-optic memory technique are different, therefore polarised light passes through The angle that three magneto-optic memory technique rear polarizer directions change passes through the first magneto-optic memory technique and the second magneto-optic memory technique rear polarizer side with polarised light It is different to the angle of change.The present invention passes through corresponding magneto-optic memory technique rear polarizer side by measuring three beams polarised light respectively To the angle beta of change₁、β₂And β₃(angle of change of polarized direction can be obtained according to the variation of light intensity), further according to respective formula The electric current in conductor can be obtained.

Assuming that distance of first magneto-optic memory technique away from conductor is R₁, distance of second magneto-optic memory technique away from conductor is R₂, and R₂=R₁ +ΔR。

It, can be according to as follows when distance of the third magneto-optic memory technique away from conductor is equal with distance of second magneto-optic memory technique away from conductor Formula calculates the electric current in conductor：

It, can be according to as follows when distance of the third magneto-optic memory technique away from conductor is equal with distance of first magneto-optic memory technique away from conductor Formula calculates the electric current in conductor：

Above in two formulas：μ₀For space permeability, V₁And D₁The German numbers of Wei Er and length of respectively the first magneto-optic memory technique, V₂And D₂The German numbers of Wei Er and length of respectively the second magneto-optic memory technique, V₃And D₃The Wei Er of respectively third magneto-optic memory technique is German Number and length, Δ θ is between the optical transmission direction in third magneto-optic memory technique and the second magneto-optic memory technique (or first magneto-optic memory technique) Angle, differences of the Δ R for distance and first magneto-optic memory technique distance away from conductor of second magneto-optic memory technique away from conductor, β₁Lead to for polarised light Cross the angle of the first magneto-optic memory technique rear polarizer direction change, β₂Changed for polarised light by the second magneto-optic memory technique rear polarizer direction Angle, β₃The angle changed for polarised light by third magneto-optic memory technique rear polarizer direction；In current course is measured, V₁、V₂、V₃、 D₁、D₂、D₃、μ₀、Δθ、ΔR、β₁、β₂And β₃These parameters are known or measurable, therefore, can just be counted by above-mentioned formula Calculate the electric current in conductor.Using three magneto-optic memory techniques as one on the whole, distance and angle of the entirety away from conductor are upper It states and is not related in two calculation formula, therefore, not by three magneto-optic memory techniques relative to the placement position of conductor in measurement process Limitation, eliminate in the prior art because between magneto-optic memory technique and conductor the uncertainty of position (including distance and angle) and Caused by measurement error.

The second object of the present invention is to what is be achieved：A kind of device that conductor current is measured using magneto-optic memory technique, including：

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；Second magneto-optic memory technique is parallel with the first magneto-optic memory technique, and the second magneto-optic Distance of the material away from conductor is more than distance of first magneto-optic memory technique away from conductor；

Third magneto-optic memory technique, counter conductor and place；Third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique It is not parallel, in fixed angles △ θ (such as △ θ between third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique It it is 90 °)；And distance of the third magneto-optic memory technique away from conductor it is equal with distance of first magneto-optic memory technique away from conductor or with the second magneto-optic material Expect that the distance away from conductor is equal；The relative position of first magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic memory technique three is fixed It is constant；

Light source, for generating a branch of measurement light；

Polarization beam-splitting unit, for receiving a branch of measurement light that the light source generates and beam splitting is three beams polarised light, three beams Incident first magneto-optic memory technique of polarised light difference, second magneto-optic memory technique and the third magneto-optic memory technique；

First analyzer, for receiving the emergent light from first magneto-optic memory technique；

Second analyzer, for receiving the emergent light from second magneto-optic memory technique；

Third analyzer, for receiving the emergent light from the third magneto-optic memory technique；

First optical detector for receiving the analyzing output light from first analyzer, and generates one first electricity Signal；

Second optical detector for receiving the analyzing output light from second analyzer, and generates one second electricity Signal；

Third optical detector for receiving the analyzing output light from the third analyzer, and generates a third electricity Signal；And

Signal processing circuit, respectively with first optical detector, second optical detector and the third optical detection Device connects, for receiving first electric signal, second electric signal and the third electric signal, and according to the electricity received Signal calculates the electric current in conductor.

In above device, the polarization beam-splitting unit includes the polarizer, the first beam splitter and the second beam splitter；It is described to be polarized Device is used to receive the measurement light that the light source generates and exports a branch of polarised light, and first beam splitter is used for the polarizer A branch of polarized light beam splitting of output is two beam polarised lights, and second beam splitter is used for first beam splitter output wherein Beam splitting is two beam polarised lights to a branch of polarised light again.

In above device, the polarization beam-splitting unit includes the first beam splitter, the second beam splitter, first polarizer, second The polarizer and the third polarizer；First beam splitter is used to measure a branch of measurement light beam splitting that the light source generates for two beams Light, wherein a branch of measurement light of the first beam splitter output is changed into a branch of polarised light after first polarizer, described Another beam of first beam splitter output measures light and measures light for two beams by beam splitting again after second beam splitter；Described second Wherein a branch of measurement light of beam splitter output is changed into a branch of polarised light after second polarizer, and second beam splitter is defeated Another beam gone out measures light and is changed into a branch of polarised light after the third polarizer.

In above device, the polarization beam-splitting unit includes the first polarization beam apparatus and the second polarization beam apparatus；Described One polarization beam apparatus is used for a branch of measurement light beam splitting for generating the light source as the two orthogonal polarised lights in beam polarization direction, Second polarization beam apparatus is used for the wherein a branch of polarised light for exporting first polarization beam apparatus, and beam splitting is two beams again The orthogonal polarised light in polarization direction.

The device of conductor current is measured using magneto-optic memory technique the present invention also provides another kind, including：

First magneto-optic memory technique, counter conductor and place；

Light source, for generating a branch of measurement light；

First polarization beam-splitting unit is three beams polarised light for receiving a branch of measurement light of the light source generation and beam splitting, Incident first magneto-optic memory technique of three beams polarised light difference, second magneto-optic memory technique and the third magneto-optic memory technique；

Second polarization beam-splitting unit, for receiving the emergent light from first magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

Third polarization beam-splitting unit, for receiving the emergent light from second magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

4th polarization beam-splitting unit, for receiving the emergent light from the third magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

First optical detector and the second optical detector, the two receive two beams from second polarization beam-splitting unit respectively Polarised light, and the first electric signal and the second electric signal are generated respectively；

Third optical detector and the 4th optical detector, the two receive two beams from the third polarization beam-splitting unit respectively Polarised light, and third electric signal and the 4th electric signal are generated respectively；

5th optical detector and the 6th optical detector, the two receive two beams from the 4th polarization beam-splitting unit respectively Polarised light, and the 5th electric signal and the 6th electric signal are generated respectively；And

Signal processing circuit, respectively with first optical detector, second optical detector, the third optical detection Device, the 4th optical detector, the 5th optical detector and the 6th optical detector connect, for receiving first electricity Signal, second electric signal, the third electric signal, the 4th electric signal, the 5th electric signal and the 6th electricity Signal, and the electric current in conductor is calculated according to the electric signal received.

In above device, second polarization beam-splitting unit, the third polarization beam-splitting unit and the 4th polarization point Shu Danyuan is polarization beam apparatus or Wollaston prism.

In above device, second polarization beam-splitting unit be the first Wollaston prism, the third polarization beam splitting list Member is the second Wollaston prism, and the 4th polarization beam-splitting unit is third Wollaston prism；First Walla this The rear end of prism, second Wollaston prism and the third Wollaston prism is both provided with double-fiber collimator, And first optical detector and second optical detector are received by optical fiber from first Wollaston prism respectively Optical signal, the third optical detector and the 4th optical detector respectively by optical fiber receive from second Walla this The optical signal of prism, the 5th optical detector and the 6th optical detector are received by optical fiber from third Walla respectively The optical signal of this prism.

The device of conductor current is measured using magneto-optic memory technique the present invention also provides the third, including：

First magneto-optic memory technique, counter conductor and place；

Third magneto-optic memory technique, counter conductor and place；Third magneto-optic memory technique is vertical with the first magneto-optic memory technique, and third magneto-optic Distance of the material away from conductor it is equal with distance of first magneto-optic memory technique away from conductor or with distance phase of second magneto-optic memory technique away from conductor Deng；The relative position of first magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic memory technique three immobilizes；

Light source, for generating a branch of measurement light；

First polarization beam apparatus is two beam polarization direction phases for receiving a branch of measurement light of the light source generation and beam splitting Mutually vertical polarised light, respectively the first transmission-polarizing light and the first polarization by reflection light；

Corner cube mirror, the first polarization by reflection light for being exported to first polarization beam apparatus carry out right angle reflection, So that the light beam after reflection is parallel to the first transmission-polarizing light of the first polarization beam apparatus output；Through the corner cube mirror Incident first magneto-optic memory technique of light beam after reflection；

Second polarization beam apparatus is for receiving the first transmission-polarizing light of first polarization beam apparatus output and beam splitting The two orthogonal polarised lights in beam polarization direction, respectively the second transmission-polarizing light and the second polarization by reflection light；Described second thoroughly Penetrate incident second magneto-optic memory technique of polarised light, the incident third magneto-optic memory technique of the second polarization by reflection light；

First Wollaston prism, for receiving the emergent light from first magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

Second Wollaston prism, for receiving the emergent light from second magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

Third Wollaston prism, for receiving the emergent light from the third magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

First optical detector and the second optical detector, the two receive two beams from first Wollaston prism respectively Polarised light, and the first electric signal and the second electric signal are generated respectively；

Third optical detector and the 4th optical detector, the two receive two beams from second Wollaston prism respectively Polarised light, and third electric signal and the 4th electric signal are generated respectively；

5th optical detector and the 6th optical detector, the two receive two beams from the third Wollaston prism respectively Polarised light, and the 5th electric signal and the 6th electric signal are generated respectively；And

Signal processing circuit, respectively with first optical detector, second optical detector, the third optical detection Device, the 4th optical detector, the 5th optical detector and the 6th optical detector connect, for receiving first electricity Signal, second electric signal, the third electric signal, the 4th electric signal, the 5th electric signal and the 6th electricity Signal, and the electric current in conductor is calculated according to the electric signal received；

First polarization beam apparatus, the corner cube mirror, second polarization beam apparatus, the first magneto-optic material Material, second magneto-optic memory technique, the third magneto-optic memory technique, first Wollaston prism, the second Wollaston rib Mirror and the third Wollaston prism one optical device integrated unit of formation glued together.

The device of conductor current is measured using magneto-optic memory technique the present invention also provides the 4th kind, including：

First magneto-optic memory technique, counter conductor and place；

Light source, for generating a branch of measurement light；

First beam splitter is that two beams measure light for receiving a branch of measurement light of the light source generation and beam splitting, respectively First transmission measurement light and the first reflection measurement light；

Second beam splitter, for receiving the first reflection measurement light of the first beam splitter output, simultaneously beam splitting is that two beams measure Light, respectively the second transmission measurement light and the second reflection measurement light；

First optical circulator, for receiving the first transmission measurement light from first beam splitter and output one First optical circulator measures light；

Second optical circulator, for receiving the second transmission measurement light from second beam splitter and output one Second optical circulator measures light；

Third optical circulator, for receiving the second reflection measurement light from second beam splitter and output one Third optical circulator measures light；

First polarization beam apparatus measures light for receiving the first optical circulator exported from first optical circulator, And generate a first transmission-polarizing light；Incident first magneto-optic memory technique of the first transmission-polarizing light, first transmission Polarised light deflects to form the first deflect light through the first magneto-optic memory technique rear polarizer direction；

Second polarization beam apparatus measures light for receiving the second optical circulator exported from second optical circulator, And generate a second transmission-polarizing light；Incident second magneto-optic memory technique of the second transmission-polarizing light, second transmission Polarised light deflects to form the second deflect light through the second magneto-optic memory technique rear polarizer direction；

Third polarization beam apparatus measures light for receiving the third optical circulator exported from the third optical circulator, And generate a third transmission-polarizing light；The incident third magneto-optic memory technique of the third transmission-polarizing light, the third transmission Polarised light deflects to form third deflect light through the third magneto-optic memory technique rear polarizer direction；

First speculum, the first deflect light for being exported to first magneto-optic memory technique carry out reflecting to form the first reflection Light, incident first magneto-optic memory technique of first reflected light；First reflected light is through the first magneto-optic memory technique rear polarizer Direction deflects to form the first return deflect light, and the first return deflect light forms two after first polarization beam apparatus The orthogonal polarised light in beam polarization direction, respectively first returns to transmission-polarizing light and the first return polarization by reflection light, described First return transmission-polarizing light forms the first return optical circulator after first optical circulator and measures light；

Second speculum, the second deflect light for being exported to second magneto-optic memory technique carry out reflecting to form the second reflection Light, incident second magneto-optic memory technique of second reflected light；Second reflected light is through the second magneto-optic memory technique rear polarizer Direction deflects to form the second return deflect light, and the second return deflect light forms two after second polarization beam apparatus The orthogonal polarised light in beam polarization direction, respectively second, which returns to transmission-polarizing light and second, returns to polarization by reflection light；It is described Second return transmission-polarizing light forms the second return optical circulator after second optical circulator and measures light；

Third speculum, the third deflect light for being exported to the third magneto-optic memory technique carry out reflecting to form third reflection Light, the incident third magneto-optic memory technique of the third reflected light；The third reflected light is through the third magneto-optic memory technique rear polarizer Direction deflects to form third return deflect light, and the third returns to deflect light and forms two after the third polarization beam apparatus The orthogonal polarised light in beam polarization direction, respectively third return to transmission-polarizing light and third returns to polarization by reflection light；It is described Third returns to transmission-polarizing light and third return optical circulator measurement light is formed after the third optical circulator；

First optical detector returns to polarization by reflection light simultaneously for receiving exported from first polarization beam apparatus first Generate the first electric signal；

Second optical detector returns to optical circulator measurement light for receiving exported from first optical circulator first And generate the second electric signal；

Third optical detector returns to polarization by reflection light simultaneously for receiving exported from second polarization beam apparatus second Generate third electric signal；

4th optical detector returns to optical circulator measurement light for receiving exported from second optical circulator second And generate the 4th electric signal；

5th optical detector returns to polarization by reflection light simultaneously for receiving the third exported from the third polarization beam apparatus Generate the 5th electric signal；

6th optical detector returns to optical circulator measurement light for receiving the third exported from the third optical circulator And generate the 6th electric signal；And

Device provided by the present invention has a variety of various forms of structures；But all these devices design when Central idea is consistent.The central idea of device provided by the present invention is three changeless magneto-optics of relative position of setting Material, and in these three magneto-optic memory techniques, the first magneto-optic memory technique is parallel with the second magneto-optic memory technique, but distance of the two away from conductor is not Together；Third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique are not parallel, but third magneto-optic memory technique away from conductor away from From with the first magneto-optic memory technique away from equal with a distance from conductor or equal with distance of second magneto-optic memory technique away from conductor.These three magneto-optic materials Material is simultaneously as current sense device.When these three magneto-optic memory techniques are in the magnetic field that electrical conductor formed, three magneto-optics The polarised light being passed through in material all can make polarization direction deflect due to Faraday effect, and three beams polarised light is respectively three The angle of transmission rear polarizer direction deflection is different in a magneto-optic memory technique, can be obtained per a branch of polarised light by corresponding to by measuring The angle (abbreviation deflection angle) that is deflected of magneto-optic memory technique rear polarizer direction, can calculate conductor by surveying three deflection angles Interior electric current.The calculating of the electric current is unrelated with distance of three magneto-optic memory techniques away from conductor and angle, therefore can eliminate existing electric current Measuring device measurement error caused by due to the variation of position between magneto-optic memory technique and conductor.

Description of the drawings

Fig. 1 is the schematic diagram for measuring conductor current using magneto-optic memory technique in the prior art.

Fig. 2 is the placement location signal of magneto-optic memory technique and conductor when measuring conductor current using magneto-optic memory technique in the prior art Figure.

Fig. 3 is the system structure diagram for measuring conductor current using magneto-optic memory technique in the prior art.

Fig. 4 is the improved system schematic for measuring conductor current in system-based shown in Fig. 3 in the prior art.

Fig. 5 is the apparatus structure schematic diagram of the embodiment of the present invention 2.

Fig. 6 is the apparatus structure schematic diagram of the embodiment of the present invention 3.

Fig. 7 is the apparatus structure schematic diagram of the embodiment of the present invention 5.

Fig. 8 is the apparatus structure schematic diagram of the embodiment of the present invention 6.

Fig. 9 is the apparatus structure schematic diagram of the embodiment of the present invention 7.

Figure 10 is the apparatus structure schematic diagram of the embodiment of the present invention 8.

In figure：1st, the first magneto-optical crystal, the 2, second magneto-optical crystal, 3, third magneto-optical crystal, 4, conductor, the 5, first beam splitting Device, the 6, second beam splitter, 7, first polarizer, 8, second polarizer, 9, the third polarizer, the 10, first analyzer, 11, second Analyzer, 12, third analyzer, the 13, first optical detector, the 14, second optical detector, the 15, third optical detector, the 16, the 4th Optical detector, the 17, the 5th optical detector, the 18, the 6th optical detector, the 19, first polarization beam apparatus, the 20, second polarization beam apparatus, 21st, third polarization beam apparatus, the 22, the 4th polarization beam apparatus, the 23, the 5th polarization beam apparatus, the 24, first Wollaston prism, 25, Second Wollaston prism, 26, third Wollaston prism, 27, double-fiber collimator, the 28, first corner cube mirror, 29, Two corner cube mirrors, the 30, first optical circulator, the 31, second optical circulator, 32, third optical circulator, the 33, first speculum, 34th, the second speculum, 35, third speculum.

Specific embodiment

Embodiment 1, a kind of method that conductor current is measured using magneto-optic memory technique.

The embodiment of the present invention does sensing head (or current sense device) using a kind of three magneto-optical crystals (magneto-optic memory technique), Conductor current is measured simultaneously to eliminate because of placement position variation and the measurement error that generates between sensing head and conductor, it is specific theoretical according to According to as follows：

As shown in figures 1 and 3, when in conductor electric current be I, apart from conductor be R magneto-optic memory technique position magnetic strength Answering intensity, according to Ampère circuital theorem, the relationship of B and I are for B：

It is that magnetic induction density B at R is apart from conductor when electric current is I if conductor is one section of long straight wire：

In formula (1) and formula (2), μ₀For space permeability.

According to Faraday effect, the light polarization rotation angle that is generated in the magneto-optic memory technique that magnetic induction density B and light are D in length Degree (or deflection angle) β relationship be：

In formula (3), θ is optical transmission direction and the angle in magnetic induction intensity direction at magneto-optic memory technique in magneto-optic memory technique, and V is magnetic The German numbers of Wei Er (Verdet constant) of luminescent material.

Measuring electric current principle using Faraday magnetooptical effect is：First, magnetic strength is obtained by measuring larization rotation angle β Intensity B (see formula (3)) is answered, then, current strength (see formula (2)) is acquired by Ampère circuital theorem.

It can be obtained by formula (2) and formula (3)：

In the current sensor design based on Faraday magnetooptical effect, many links all can generate shadow to measurement accuracy It rings.This includes the Wei Erde coefficient determinations of magneto-optic memory technique, the dimension measurement of magneto-optic memory technique, and sensing head is relative to treating in actual use Survey the spatial position of conductor, the measurement of change of polarization angle.

Sensing head includes again relative to the spatial position of conductor to be measured：Optical direction and conductor center to be measured in sensing head The angle theta of optical direction and magnetic direction at sensing head in distance R and sensing head.Problem to be solved by this invention is exactly： Sensing head is overcome to be influenced caused by current measurement precision relative to the spatial position (including distance and angle) of conductor to be measured.

Three magneto-optic memory techniques are respectively defined as the first magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic material in the present invention Material.And assume that the first magneto-optic memory technique is parallel with the second magneto-optic memory technique, distance of first magneto-optic memory technique away from conductor is R₁, the second magneto-optic Distance of the material away from conductor is R₂, and have R₂=R₁+ΔR；Magnetic field at optical direction and the first magneto-optic memory technique in first magneto-optic memory technique Angle between direction is θ, the angle in the second magneto-optic memory technique at optical direction and the second magneto-optic memory technique between magnetic direction For θ.Third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique are not parallel, third magneto-optic memory technique and the first magneto-optic material Angle between material (or second magneto-optic memory technique) is Δ θ, optical direction and magnetic field at third magneto-optic memory technique in third magneto-optic memory technique Angle between direction is θ+Δ θ；Distance of the third magneto-optic memory technique away from conductor is R₃, R₃Equal to R₁Or equal to R₂.Three magneto-optic materials The relative position of material immobilizes.If the length of the first magneto-optic memory technique is D₁, the German numbers of Wei Er are V₁, polarised light is through the first magneto-optic The angle that material rear polarizer direction changes is β₁；The length of second magneto-optic memory technique is D₂, the German numbers of Wei Er are V₂, polarised light is through The angle that two magneto-optic memory technique rear polarizer directions change is β₂；The length of third magneto-optic memory technique is D₃, the German numbers of Wei Er are V₃, polarization The angle that light changes through third magneto-optic memory technique rear polarizer direction is β₃。

Assuming that distance of the third magneto-optic memory technique away from conductor is equal with distance of first magneto-optic memory technique away from conductor, i.e.,：R₃=R₁。

According to formula (4), have：

According to formula (5) and (6), in conjunction with R₂=R₁+ Δ R, can obtain：

It can be obtained according to formula (5)：

Therefore have：

It can be obtained according to formula (7)：

Again due to cos (θ+Δ θ)=cos θ cos Δs θ-sin θ sin Δ θ, have：

The calculation formula of electric current I can be obtained according to formula (9)：

Abbreviation is carried out to formula (10), obtains formula (11), it is as follows：

It, can be by the way that third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique be set to hang down in practical application Directly, i.e., so that Δ θ=90 °, in such cases formula (11) can abbreviation be：

In the case of above-mentioned Δ θ=90 °, three magneto-optic memory techniques can also be made using identical material, and be processed into same Sample length, then have：V₁=V₂=V₃=V, D₁=D₂=D₃=D, at this time formula (12) can abbreviation be：

Similarly, if distance of the third magneto-optic memory technique away from conductor is equal with distance of second magneto-optic memory technique away from conductor, i.e.,：R₃= R₂=R₁+ Δ R then calculates the electric current in conductor using equation below：

If Δ θ=90 °, formula (14) abbreviation is：

If V₁=V₂=V₃=V, D₁=D₂=D₃=D, then formula (15) abbreviation be：

By above formula (11), (12), (13), (14), (15) and (16) it is found that electric current and Δ R in conductor and Δ θ It is related, and it is completely irrelevant with distance of three magneto-optic memory techniques (as an entirety) away from conductor and angle.It is possible thereby to prove this Measurement error caused by invention can be successfully overcome when sensing head changes relative to conductor position to be measured.

It should be noted that it should ensure that the relative position of three magneto-optic memory techniques immobilizes in measurement process, i.e., by setting Three magneto-optic memory techniques are put so that Δ R and Δ θ is the value that immobilizes.

The method provided in an embodiment of the present invention that conductor current is measured using magneto-optic memory technique, is included the following steps：

A, three magneto-optical crystals, respectively the first magneto-optical crystal, the second magneto-optical crystal and the are set near conductor to be measured Three magneto-optical crystals, and the relative position of three magneto-optical crystals immobilizes.The German numbers of Wei Er of first magneto-optical crystal are V₁, length For D₁；The German numbers of Wei Er of second magneto-optical crystal are V₂, length D₂；The German numbers of Wei Er of third magneto-optical crystal are V₃, length is D₃.First magneto-optical crystal is parallel with the second magneto-optical crystal, and distance of first magneto-optical crystal away from conductor is R₁, the second magneto-optical crystal away from The distance of conductor is R₂, and have R₂=R₁+ΔR；Third magneto-optical crystal and the first magneto-optical crystal and the second magneto-optical crystal are uneven Row, the angle in third magneto-optical crystal in optical direction and the first magneto-optical crystal or the second magneto-optical crystal between optical direction is Δ θ (0 180 ° of ＜ Δ θ ＜), distance of the third magneto-optical crystal away from conductor are equal with distance of first magneto-optical crystal away from conductor or with Distance of two magneto-optical crystals away from conductor is equal.After three magneto-optical crystals are set relative to the position of conductor, Δ R and Δ θ are fixed It is constant.

B, light source is set；The light that light source is sent out is made to be changed into three beams linearly polarized light, respectively the first linearly polarized light, the second line Polarised light and third linearly polarized light；Incident first magneto-optical crystal of axial line for making the first linearly polarized light along the first magneto-optical crystal, makes Incident second magneto-optical crystal of axial line of second linearly polarized light along the second magneto-optical crystal, makes third linearly polarized light along third magneto-optic crystalline substance The axial line incidence third magneto-optical crystal of body.Electric current in conductor can generate magnetic field at three magneto-optical crystals, due to faraday Effect, the polarization direction of the linearly polarized light of incident magneto-optical crystal will deflect.

C, the first deflection angle that the first linearly polarized light is deflected by light beam polarization direction after the first magneto-optical crystal is measured β₁, measure the second deflection angle β that the second linearly polarized light is deflected by light beam polarization direction after the second magneto-optical crystal₂, measure the The third deflection angle β that three linearly polarized lights are deflected by light beam polarization direction after third magneto-optical crystal₃.First deflection angle β₁It can It is acquired after measuring the first linearly polarized light by the first magneto-optical crystal, then by the variation of light intensity after an analyzer, the Two deflection angle β₂After can be by measuring the second linearly polarized light by the second magneto-optical crystal, then the change by light intensity after an analyzer Change and acquire, third deflection angle β₃After can be by measuring third linearly polarized light by third magneto-optical crystal, then pass through an analyzing The variation of light intensity after device and acquire.

D, the electric current in conductor can be calculated according to formula (11) or formula (14) above.

By the method in the present invention, can be solved during current measurement due to the distance between sensing head and conductor and The problem of measurement accuracy reduces caused by angular error.

Explanation：Using linearly polarized light in the embodiment of the present invention, other polarised lights (such as elliptically polarized light) as long as logical Angular deflection is generated when crossing magneto-optic memory technique because of current field, can use this method.

Embodiment 2, a kind of device that conductor current is measured using magneto-optic memory technique.

As shown in figure 5, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, third magneto-optic crystalline substance Body 3, the first beam splitter 5, the second beam splitter 6, first polarizer 7, second polarizer 8, the third polarizer 9, the first analyzer 10, Second analyzer 11, third analyzer 12, the first optical detector 13, the second optical detector 14, third optical detector 15, at signal Reason circuit, light source and the optic path device (such as optical fiber etc.) for realizing the connection of these devices.

First magneto-optical crystal 1, the second magneto-optical crystal 2 and third magneto-optical crystal 3 are arranged near conductor 4 to be measured.The One magneto-optical crystal 1 is parallel with the second magneto-optical crystal 2, and the first distance of the magneto-optical crystal 1 away from conductor 4 is R₁, the second magneto-optical crystal 2 away from The distance of conductor 4 is R₂, R₁＜ R₂, and R₁+ Δ R=R₂；R₁And R₂It can change, but to ensure that Δ R immobilizes.The present embodiment Distance and second magneto-optical crystal 2 distance away from conductor 4 of the middle third magneto-optical crystal 3 away from conductor 4 are equal, and third magneto-optical crystal 3 Angle Δ θ in interior optical direction and the second magneto-optical crystal 2 between optical direction immobilizes.Than more preferably technical solution It is：It it is 90 ° by setting the angle Δ θ in third magneto-optical crystal and the second magneto-optical crystal between optical direction.More preferably Scheme, make the placing direction of third magneto-optical crystal and the second magneto-optical crystal meet：Optical direction is with leading in two magneto-optical crystals Angle between the magnetic direction that internal electric current generates is 45 ° or close to 45 ° (such as 44 °~46 °).

Light source is arranged in front of three magneto-optical crystals, and (generally polarization state can not for generating a branch of measurement light for light source Know).First beam splitter 5 is arranged on light source rear, and it is two that the first beam splitter 5, which is used for measurement light beam splitting a branch of caused by light source, Beam measures light, respectively the first transmission measurement light and the first reflection measurement light.First polarizer 7 is arranged on 5 He of the first beam splitter Between first magneto-optical crystal 1, first polarizer 7 receives the first transmission measurement light of the first beam splitter 5 output and exports First Line In polarised light to the first magneto-optical crystal 1.Second beam splitter 6 is used for the first reflection measurement light beam splitting for exporting the first beam splitter 5 Light, respectively the second transmission measurement light and the second reflection measurement light are measured for two beams.Second polarizer 8 is used for the second beam splitter Second transmission measurement light of 6 outputs is changed into the second linearly polarized light and is input in the second magneto-optical crystal 2, and second polarizer 9 is used In the second reflection measurement light that the second beam splitter 6 exports is changed into third linearly polarized light and is input in third magneto-optical crystal 3.

First beam splitter 5, the second beam splitter 6, first polarizer 7, second polarizer 8 and the third polarizer 9 five are formed One polarization beam-splitting unit, the effect of polarization beam-splitting unit are：For measuring light beam splitting as three beams by a branch of caused by light source Linearly polarized light, respectively the first linearly polarized light, the second linearly polarized light and third linearly polarized light, the three beams linearly polarized light point after beam splitting Not incident first magneto-optical crystal 1, the second magneto-optical crystal 2 and third magneto-optical crystal 3.

First linearly polarized light, the second linearly polarized light and third linearly polarized light transmit in three magneto-optical crystals, can be due to method It draws magneto-optic effect and polarization direction is caused to deflect, at the angle that polarization direction deflects and corresponding magneto-optical crystal Magnetic induction intensity it is related.First analyzer 10 is arranged on 1 rear of the first magneto-optical crystal, is used to receive brilliant from the first magneto-optic The emergent light of body 1, and light component inconsistent with its polarization direction in the polarised light received is filtered out.Preferably, can make The polarization direction (i.e. optical axis direction) of first analyzer 10 and polarization direction (i.e. optical axis direction) phase of first polarizer 7 Together, in this way, the first analyzer 10 be just used for by the first linearly polarized light when the first magneto-optical crystal 1 caused by polarization direction occur it is inclined The light component inconsistent with 10 polarization direction of the first analyzer after turning filters out.Second analyzer 11 is arranged on the second magneto-optic crystalline substance 2 rear of body, is used to receiving the emergent light from the second magneto-optical crystal 2, and by the polarised light received with its polarization side It is filtered out to inconsistent light component.Preferably, the polarization direction of the second analyzer 11 and the polarization of second polarizer 8 can be made It is identical to change direction, in this way, the second analyzer 11 be just used for by the second linearly polarized light when the second magneto-optical crystal 2 caused by polarization side The light component inconsistent with 11 polarization direction of the second analyzer after deflecting filters out.Third analyzer 12 is arranged on Three magneto-optical crystals, 3 rear, is used to receiving the emergent light from third magneto-optical crystal 3, and by the polarised light received with its The inconsistent light component of polarization direction filters out.Preferably, polarization direction (the i.e. optical axis side of third analyzer 12 can be made To) identical with the polarization direction (i.e. optical axis direction) of the third polarizer 9, in this way, third analyzer 12 is just used for third line Polarised light polarization direction caused by due to third magneto-optical crystal 3 deflect after differ with 12 polarization direction of third analyzer The light component of cause filters out.The polarization direction of first analyzer 10 and the polarization direction phase of first polarizer 7 are made by setting Together, the polarization direction for making the second analyzer 11 is identical with the polarization direction of second polarizer 8, makes the inclined of third analyzer 12 Shaking direction is identical with the polarization direction of the third polarizer 9, can make the later stage pass through measure light intensity calculate deflection angle it is simpler Just.

First optical detector 13 is arranged on the rear of the first analyzer 10, is used to receive the inspection from the first analyzer 10 Inclined output light, and generate first electric signal.Second optical detector 14 is arranged on the rear of the second analyzer 11, is used to connect The analyzing output light from the second analyzer 11 is received, and generates second electric signal.Third optical detector 15 is arranged on third The rear of analyzer 12 is used to receive the analyzing output light from third analyzer 12, and generate a third electric signal.

Signal processing circuit connects respectively with the first optical detector 13, the second optical detector 14 and third optical detector 15, For receiving the second electric signal and the third light that the first electric signal, the second optical detector 14 that the first optical detector 13 generates generate The third electric signal that detector 15 generates；Signal processing circuit calculates the first linearly polarized light warp according to the first electric signal received The first deflection angle that first magneto-optical crystal, 1 rear polarizer direction deflects calculates the second line according to the second electric signal received The second deflection angle that polarised light deflects through 2 rear polarizer direction of the second magneto-optical crystal, according to the third electric signal meter received Calculate the third deflection angle that deflects through 3 rear polarizer direction of third magneto-optical crystal of third linearly polarized light, further according to the first deflection angle, Second deflection angle and third deflection angle calculate the electric current in conductor (specific formula for calculation is shown in formula (14) in embodiment 1).

The variation of deflection angle is judged by the light intensity signal received by optical detector, both may be used and be input to light source The method that the light intensity of system is compared, can also use field calibration measure method (i.e. by current known magnetic field etc. into Row system calibration).

Embodiment 3, a kind of device that conductor current is measured using magneto-optic memory technique.

As shown in fig. 6, the present embodiment compared with Example 2 except that：Polarization beam-splitting unit in the present embodiment by First polarizer 7, the first beam splitter 5 and the second beam splitter 6 are formed.First polarizer 7 is placed on the rear of light source, is used to connect It receives the measurement light that light source is sent out and generates a branch of linearly polarized light.First beam splitter 5 and the second beam splitter 6 are arranged on first polarizer Between 7 and three magneto-optical crystals, it is two beams that the first beam splitter 5, which is used for a branch of linearly polarized light beam splitting from the inclined device 7 of the first, Linearly polarized light, the respectively first transmission linearly polarized light and the first reflection linearly polarized light, the first transmission linearly polarized light (corresponding embodiment The first linearly polarized light in 2) the first magneto-optical crystal 1 of incidence, the first incident second beam splitter 6 of reflection linearly polarized light.Second beam splitting Device 6 is used for the first reflection linearly polarized light for exporting the first beam splitter 5, and beam splitting is two bunch polarised lights again, and respectively second thoroughly Ray polarised light and the second reflection linearly polarized light, the second transmission linearly polarized light (the second linearly polarized light in corresponding embodiment 2) enter Penetrate the second magneto-optical crystal 2, the incident third magneto-optical crystal of the second reflection linearly polarized light (the third linearly polarized light in corresponding embodiment 2) 3。

Other device architectures, connection relation and course of work etc. can be found in described in embodiment 2 in the present embodiment.

Embodiment 4, a kind of device that conductor current is measured using magneto-optic memory technique.

The present embodiment compared with embodiment 2, embodiment 3 except that：Polarization beam-splitting unit is two in the present embodiment Polarization beam apparatus, respectively the first polarization beam apparatus and the second polarization beam apparatus；First polarization beam apparatus is used to generate light source A branch of measurement light beam splitting for the two orthogonal linearly polarized lights in beam polarization direction, wherein the directly incidence first of a branch of linearly polarized light Magneto-optical crystal, in addition a branch of linearly polarized light is into the second polarization beam apparatus, the linearly polarized light that the second polarization beam apparatus will receive The two orthogonal linearly polarized lights in beam polarization direction are separated into, incident second magneto-optical crystal of two bunch polarised lights difference after beam splitting With third magneto-optical crystal.

It is more to describe herein, the optical axis of the second polarization beam apparatus should as possible and the linearly polarized light angle at 45 ° that receives, To ensure that the light intensity of two beam polarised lights of the second polarization beam apparatus output is roughly the same.

Embodiment 5, a kind of device that conductor current is measured using magneto-optic memory technique.

As shown in fig. 7, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, third magneto-optic crystalline substance Body 3, the first polarization beam apparatus 19, the second polarization beam apparatus 20, third polarization beam apparatus 21, the 4th polarization beam apparatus the 22, the 5th Polarization beam apparatus 23, the first optical detector 13, the second optical detector 14, third optical detector 15, the 4th optical detector the 16, the 5th Optical detector 17, the 6th optical detector 18, signal processing circuit, light source and the optic path device for realizing the connection of these devices (such as optical fiber etc.).

The set-up mode of the first magneto-optical crystal 1, the second magneto-optical crystal 2 and third magneto-optical crystal 3 can be found in the present embodiment Described in embodiment 2.

Light source is arranged on the front of three magneto-optical crystals, and light source is used to generate a branch of measurement light.First polarization beam apparatus 19 And second polarization beam apparatus 20 be arranged between light source and three magneto-optical crystals, the first polarization beam apparatus 19 is for receiving from light A branch of measurement light in source simultaneously generates the two orthogonal linearly polarized lights in beam polarization direction, the respectively first transmission linearly polarized light and the One reflection linearly polarized light, directly incident first magneto-optic of the first transmission linearly polarized light (the first linearly polarized light in corresponding embodiment 2) Crystal 1, the first incident second polarization beam apparatus 20 of reflection linearly polarized light.Second polarization beam apparatus 20 is used for the first polarization beam splitting Device 19 export first reflection linearly polarized light again beam splitting be the two orthogonal linearly polarized lights in beam polarization direction, respectively second Transmit linearly polarized light and the second reflection linearly polarized light, the second transmission linearly polarized light (the second linearly polarized light in corresponding embodiment 2) Incident second magneto-optical crystal 2, the incident third magneto-optic of the second reflection linearly polarized light (the third linearly polarized light in corresponding embodiment 2) are brilliant Body 3.

The first polarization beam apparatus 19 and the second polarization beam apparatus 20 in the present embodiment form a polarization beam-splitting unit, should The other embodiment of polarization beam-splitting unit can refer to described in embodiment 2 or embodiment 3.

First transmission linearly polarized light, the second transmission linearly polarized light and the second reflection linearly polarized light pass in three magneto-optical crystals Defeated, the polarization direction of the linearly polarized light after three magneto-optical crystals are emitted is deflected.Third polarization beam apparatus 21 is arranged on The rear of first magneto-optical crystal 1, is used to receiving the emergent light from the first magneto-optical crystal 1 and is two beam polarization sides by its beam splitting To orthogonal linearly polarized light.Preferably, the optical axis pair of the optical axis of third polarization beam apparatus 21 and the first polarization beam apparatus 19 Together.4th polarization beam apparatus 22 is arranged on the rear of the second magneto-optical crystal 2, is used to receive going out from the second magneto-optical crystal 2 Penetrate light and by its beam splitting be the two orthogonal linearly polarized lights in beam polarization direction.Preferably, the optical axis of the 4th polarization beam apparatus 22 With the optical axis alignment of the second polarization beam apparatus 20.5th polarization beam apparatus 23 is arranged on the rear of third magneto-optical crystal 3, is used for Receive the emergent light from third magneto-optical crystal 3 and by its beam splitting be the two orthogonal linearly polarized lights in beam polarization direction.It is preferred that , the optical axis alignment of the optical axis of the 5th polarization beam apparatus 23 and the second polarization beam apparatus 20.

First optical detector 13 and the second optical detector 14 are arranged on the rear of third polarization beam apparatus 21, and the two connects respectively The two bunch polarised lights from third polarization beam apparatus 21 are received, and generate the first electric signal and the second electric signal respectively.Third light 15 and the 4th optical detector 16 of detector is arranged on the rear of the 4th polarization beam apparatus 22, and the two is received respectively from the 4th polarization Two bunch polarised lights of beam splitter 22, and third electric signal and the 4th electric signal are generated respectively.5th optical detector 17 and the 6th Optical detector 18 is arranged on the rear of the 5th polarization beam apparatus 23, and the two receives two beams from the 5th polarization beam apparatus 23 respectively Linearly polarized light, and the 5th electric signal and the 6th electric signal are generated respectively.

Signal processing circuit respectively with the first optical detector 13, the second optical detector 14, third optical detector 15, the 4th light Detector 16, the 5th optical detector 17 and the 6th optical detector 18 connect, for receiving the first electric signal, the second electric signal, the Three electric signals, the 4th electric signal, the 5th electric signal and the 6th electric signal.Signal processing circuit when receiving six kinds of electric signals, The first transmission linearly polarized light is calculated through 1 rear polarizer direction of the first magneto-optical crystal according to the first electric signal and the second electric signal first The first deflection angle to deflect calculates the second transmission linearly polarized light through the second magnetic according to third electric signal and the 4th electric signal It is anti-to calculate second according to the 5th electric signal and the 6th electric signal for the second deflection angle that 2 rear polarizer direction of luminescent crystal deflects The third deflection angle that ray polarised light deflects through 3 rear polarizer direction of third magneto-optical crystal, further according to the first deflection angle, second Deflection angle and third deflection angle calculate the electric current in conductor 4.

The present embodiment can eliminate power swing in light source output and signals transmission compared with three embodiments above Caused by detection error.

Equally in this embodiment, the optical axis of the second polarization beam apparatus 20 should as possible and the linearly polarized light that receives (the first reflection linearly polarized light) angle at 45 °, to ensure two bunch polarised light (the second radioparents of the second polarization beam apparatus 20 output Polarised light and second reflection linearly polarized light) light intensity it is roughly the same.

Embodiment 6, a kind of device that conductor current is measured using magneto-optic memory technique.

As shown in figure 8, the present embodiment compared with Example 5 except that：The present embodiment is by the first Wollaston prism 24 replace the third polarization beam apparatus 21 (see Fig. 7) in embodiment 5, are replaced in embodiment 5 by the second Wollaston prism 25 4th polarization beam apparatus 22 (see Fig. 7) replaces the 5th polarization beam apparatus 23 in embodiment 5 by third Wollaston prism 26 (see Fig. 7).Wollaston prism is identical with the effect of polarization beam apparatus, and it is two beam polarization directions to contribute to light beam beam splitting Orthogonal linearly polarized light.

The polarization beam apparatus in embodiment 5 is replaced by Wollaston prism in the present embodiment, it is possible to reduce because of polarization point Loss in beam device spectroscopic processes, while the integrated of system can also be more advantageous to.It is fertile in the first Wollaston prism 24, second The rear end of Lars prism 25 and third Wollaston prism 26 with double-fiber collimator 27, is conducive to connect with fiber coupling Connect, and light direction is all in the side of prism, compared with the vertical polarization beam apparatus of two beam light directions, Wollaston prism and Double-fiber collimator combines the arrangement for being more advantageous to optical fiber.

Embodiment 7, a kind of device that conductor current is measured using magneto-optic memory technique.

As shown in figure 9, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, third magneto-optic crystalline substance Body 3, the first polarization beam apparatus 19, the second polarization beam apparatus 20, the first Wollaston prism 24, the second Wollaston prism 25, Third Wollaston prism 26, the first corner cube mirror 28, the second corner cube mirror 29, the first optical detector 13, the second light are visited Survey device 14, third optical detector 15, the 4th optical detector 16, the 5th optical detector 17, the 6th optical detector 18, signal processing electricity Road, light source and the optic path device (such as optical fiber etc.) for realizing the connection of these devices.The rear end of three Wollaston prisms Carry double-fiber collimator.

The first magneto-optical crystal 1 is fixed with 2 parallel and the two relative position of the second magneto-optical crystal in the present embodiment；First magnetic Distance of the luminescent crystal 1 away from conductor 4 is R₁, the second distance of the magneto-optical crystal 2 away from conductor 4 is R₂, R₁＜ R₂, and R₁+ Δ R=R₂.The Three distances of the magneto-optical crystal 3 away from conductor 4 are also R₂；Third magneto-optical crystal 3 and 2 vertical and the two opposite position of the second magneto-optical crystal Put fixation.20 (the first polarization point glued together of the transmission light gasing surface of first polarization beam apparatus 19 and the second polarization beam apparatus The transmission light direction of beam device 19 and the optical axis direction of the second polarization beam apparatus 20 are as possible close to 45 °), the second polarization beam apparatus 20 The incident light pass surface for transmiting light gasing surface and the second magneto-optical crystal 2 is mutually glued, the outgoing light pass surface and second of the second magneto-optical crystal 2 25 phase of Wollaston prism is glued；The incident thang-kng of the reflection light gasing surface and third magneto-optical crystal 3 of second polarization beam apparatus 20 Face is mutually glued, and the second magneto-optical crystal 2 realizes vertical connection with third magneto-optical crystal 3 by the second polarization beam apparatus 20.Third magnetic The outgoing light pass surface of luminescent crystal 3 and the incident light pass surface of the second corner cube mirror 29 are mutually glued, and the second corner cube mirror 29 goes out Penetrate light pass surface and 26 phase of third Wollaston prism gluing.The reflection light gasing surface and the first right angle of first polarization beam apparatus 19 are anti- The incident light pass surface for penetrating mirror 28 is mutually glued, and the outgoing light pass surface of the first corner cube mirror 28 and the incidence of the first magneto-optical crystal 1 are led to Smooth surface is mutually glued, outgoing light pass surface and 24 phase of the first Wollaston prism gluing of the first magneto-optical crystal 1.First polarization beam apparatus 19th, the second polarization beam apparatus 20, the first corner cube mirror 28, the second corner cube mirror 29, the first magneto-optical crystal 1, the second magneto-optic Crystal 2, third magneto-optical crystal 3, the first Wollaston prism 24, the second Wollaston prism 25 and third Wollaston prism 26, this ten cementing of optical elements form an optical device integrated unit together.The present embodiment, can by this integrated Minimize current detecting sensing head；It can also avoid in installation process simultaneously, because the first magneto-optical crystal 1, the second magneto-optic are brilliant The error of installation site (angle and distance) between body 2 and third magneto-optical crystal 3 and caused by measurement error.

Other than above-mentioned integrated morphology and 6 difference of embodiment, the present embodiment two right angles more compared with Example 6 Speculum, this is because：There is no limit connection modes between light path in embodiment 6, and general spatial light optics device both can be used Part connects, and can also be realized by optical fiber connection, i.e.,：In embodiment 6, by the first polarization beam apparatus 19 and the second polarization Linearly polarized light caused by beam splitter 20 is input to the first magneto-optical crystal 1, the second magneto-optical crystal 2 by optic path device respectively With third magneto-optical crystal 3, there is no need to corner cube mirrors.And in the present embodiment, it is adjacent due in optical device integrated unit Optic path between device can not be completed by optical fiber etc., it is therefore desirable to be divided the first polarization by the first corner cube mirror 28 Reflection linearly polarized light is reflected and (is reflected on the bevel edge of the first corner cube mirror 28) caused by beam device 19, so that after reflection Light and the first polarization beam apparatus 19 caused by transmission linearly polarized light it is parallel, radioparent caused by the first polarization beam apparatus 19 Polarised light transmits away after the second polarization beam apparatus 20, incident second magneto-optical crystal 2, can ensure that incident first magneto-optic is brilliant in this way The linearly polarized light of body 1 is parallel with the linearly polarized light of incident second magneto-optical crystal 2.And it is connected to second on third magneto-optical crystal 3 Corner cube mirror 29, main function are measurement light and other two magneto-optical crystal in order to enable from third magneto-optical crystal 3 Outgoing light direction it is consistent, convenient for the connection of optical fiber and optical device integrated unit.Certainly, it is not provided with second in other embodiment Corner cube mirror 29 is also feasible.

Optical device integrated unit is placed near conductor 4, and light source is arranged on the front of optical device integrated unit, light It can still be connected between source and optical device integrated unit, between optical device integrated unit and optical detector by optical fiber.

Light source is used to generate a branch of measurement light.A branch of measurement light is transmitted to the first polarization beam splitting through optical fiber caused by light source Device 19 generates the two orthogonal linearly polarized lights in beam polarization direction by the first polarization beam apparatus 19, and respectively the first radioparent is inclined Shake light and the first reflection linearly polarized light；First transmission linearly polarized light after the second polarization beam apparatus 20 using being divided into two beam polarization sides To orthogonal linearly polarized light, the respectively second transmission linearly polarized light and the second reflection linearly polarized light, the second transmission linear polarization Light the second magneto-optical crystal 2 of incidence, the second reflection linearly polarized light incidence third magneto-optical crystal 3.It is generated by the first polarization beam apparatus 19 The first reflection linearly polarized light be incident on the first corner cube mirror 28, the first reflection linearly polarized light is anti-through the first corner cube mirror 28 Incident first magneto-optical crystal 1 after penetrating.

First reflection linearly polarized light, the second transmission linearly polarized light and the second reflection linearly polarized light pass in three magneto-optical crystals Defeated, the polarization direction of the linearly polarized light after three magneto-optical crystals are emitted is deflected.First Wollaston prism 24 receives Emergent light from the first magneto-optical crystal 1, and be the two orthogonal lines in beam polarization direction by the linearly polarized light beam splitting received Polarised light；Two bunch polarised lights after beam splitting are input to the first optical detector 13 and the second optical detector 14 by optical fiber respectively, First optical detector 13 and the second optical detector 14 are after the linearly polarized light from the first Wollaston prism 24 is received, respectively Generate an electric signal (the first optical detector 13 generates the first electric signal, and the second optical detector 14 generates the second electric signal).The Two Wollaston prisms 25 receive the emergent light from the second magneto-optical crystal 2, and are two beams by the linearly polarized light beam splitting received The orthogonal linearly polarized light in polarization direction；Two bunch polarised lights after beam splitting are input to third optical detector by optical fiber respectively 15 and the 4th optical detector 16,15 and the 4th optical detector 16 of third optical detector receiving from the second Wollaston prism After 25 linearly polarized light, generating an electric signal respectively, (third optical detector 15 generates third electric signal, the 4th optical detector 16 Generate the 4th electric signal).The light that third magneto-optical crystal 3 is emitted incident third Wollaston after the reflection of the second corner cube mirror 29 Prism 26, in this way, the thang-kng in the light and the first magneto-optical crystal 1 and the second magneto-optical crystal 2 of incident third Wollaston prism 26 Direction is parallel；A branch of linearly polarized light beam splitting is the two orthogonal linear polarizations in beam polarization direction by third Wollaston prism 26 Light；Two bunch polarised lights after beam splitting are input to the 5th optical detector 17 and the 6th optical detector 18 by optical fiber respectively, and the 5th 17 and the 6th optical detector 18 of optical detector generates respectively after the linearly polarized light from third Wollaston prism 26 is received One electric signal (the 5th optical detector 17 generates the 5th electric signal, and the 6th optical detector 18 generates the 6th electric signal).

Signal processing circuit respectively with the first optical detector 13, the second optical detector 14, third optical detector 15, the 4th light Detector 16, the 5th optical detector 17 and the 6th optical detector 18 connect, for receiving the first electric signal, the second electric signal, the Three electric signals, the 4th electric signal, the 5th electric signal and the 6th electric signal.Signal processing circuit when receiving six kinds of electric signals, The first reflection linearly polarized light is calculated according to the first electric signal and the second electric signal through 1 rear polarizer direction of the first magneto-optical crystal to occur First deflection angle of deflection calculates the second transmission linearly polarized light through the second magneto-optic crystalline substance according to third electric signal and the 4th electric signal The second deflection angle that 2 rear polarizer direction of body deflects, the second reflected ray is calculated according to the 5th electric signal and the 6th electric signal The third deflection angle that polarised light deflects through 3 rear polarizer direction of third magneto-optical crystal, further according to the first deflection angle, the second deflection Angle and third deflection angle calculate the electric current in conductor 4.

Embodiment 8, a kind of device that conductor current is measured using magneto-optic memory technique.

As shown in Figure 10, it is brilliant to include the first magneto-optical crystal 1, the second magneto-optical crystal 2, third magneto-optic for the device in the present embodiment Body 3, the first beam splitter 5, the second beam splitter 6, the first polarization beam apparatus 19, the second polarization beam apparatus 20, third polarization beam apparatus 21st, the first optical circulator 30, the second optical circulator 31, third optical circulator 32, the first speculum 33, the second speculum 34, Three speculums 35, the first optical detector 13, the second optical detector 14, third optical detector 15, the 4th optical detector 16, the 5th light Detector 17, the 6th optical detector 18, signal processing circuit, light source and the optic path device for realizing the connection of these devices (such as optical fiber etc.).

Light source is placed in front of three magneto-optical crystals, and light source is used to generate a branch of measurement light.After first beam splitter 5 is located at light source Side, the first beam splitter 5 is used to receive a branch of measurement light of light source generation and beam splitting measures light, respectively transmissive for two beams First transmission measurement light and the past first reflection measurement light of reflection, the first reflection measurement light are further divided into after the second beam splitter 6 Two beams measure light, respectively the second transmission measurement light and the second reflection measurement light.First optical circulator 30, the second optical circulator 31 It is located at 6 rear of the first beam splitter 5 and the second beam splitter with third optical circulator 32, there are three ports for each optical circulator (being respectively left port, right output port and lower port).

First transmission measurement light by the first optical circulator 30 incident first optical circulator 30 of left port, and by first ring of light The light that first optical circulator, 30 right output port exports is known as the first optical circulator and measures light by the right output port output of shape device 30.First Polarization beam apparatus 19 is between the first optical circulator 30 and the first magneto-optical crystal 1.First polarization beam apparatus 19 is received from the First optical circulator of one optical circulator 30 measures light, and generates the two orthogonal linearly polarized lights in beam polarization direction, respectively First transmission linearly polarized light and the first reflection linearly polarized light；First reflection linearly polarized light generated here is (along Figure 10 first Polarization beam apparatus 19 transmits upwards) it is not used in the present embodiment device, therefore no longer refer to.First transmission linearly polarized light is incident First magneto-optical crystal 1, polarization direction deflects the first transmission linearly polarized light during transmission in the first magneto-optical crystal 1, i.e.,：Through The polarization direction of the linearly polarized light of one magneto-optical crystal 1 outgoing is compared with the polarization direction of the first transmission linearly polarized light, between the two Differ first deflection angle；First transmission linearly polarized light is exported after the first magneto-optical crystal 1 transmits by the first magneto-optical crystal 1 Linearly polarized light be known as the first deflect light.First speculum 33 is located at the rear of the first magneto-optical crystal 1, and the first magneto-optical crystal 1 goes out For the first deflect light penetrated after the reflection of the first speculum 33, the light after being reflected by the first speculum 33 is known as the first reflected light, the One reflected light is the light after the first deflection light reflection.First reflected light the first magneto-optical crystal 1 of incidence, the first reflected light is through first 1 rear polarizer direction of magneto-optical crystal deflects again, and the deflection angle occurred is still the first deflection angle, by the first reflected light The light being emitted after the first magneto-optical crystal 1 by the first magneto-optical crystal 1 is known as the first return deflect light.First returns to deflect light again It is the two orthogonal linearly polarized lights in beam polarization direction by 19 beam splitting of the first polarization beam apparatus through the first polarization beam apparatus 19, point Not Wei first return transmission linearly polarized light and first return reflection linearly polarized light, first return reflection linearly polarized light is visited by the first light Device 13 is surveyed to receive, and generates first electric signal；First returns to transmission right end of the linearly polarized light through the first optical circulator 30 It is exported after mouthful by the lower port of the first optical circulator 30, the light of output is known as the first return optical circulator and measures light, this first is returned Light echo circulator measures light and is received by the second optical detector 14, and generates second electric signal.

Second transmission measurement light by the second optical circulator 31 incident second optical circulator 31 of left port, and by second ring of light The light that second optical circulator, 31 right output port exports is known as the second optical circulator and measures light by the right output port output of shape device 31.Second Polarization beam apparatus 20 is between the second optical circulator 31 and the second magneto-optical crystal 2.Second polarization beam apparatus 20 is received from the Second optical circulator of two optical circulators 31 measures light, and generates the two orthogonal linearly polarized lights in beam polarization direction, respectively Second transmission linearly polarized light and the second reflection linearly polarized light；Second reflection linearly polarized light generated here is (along Figure 10 second Polarization beam apparatus 20 transmits upwards) it is not used in the present embodiment device, therefore no longer refer to.Second transmission linearly polarized light is incident Second magneto-optical crystal 2, polarization direction deflects the second transmission linearly polarized light during transmission in the second magneto-optical crystal 2, i.e.,：Through The polarization direction of the linearly polarized light of two magneto-optical crystals 2 outgoing is compared with the polarization direction of the second transmission linearly polarized light, between the two Differ second deflection angle；Second transmission linearly polarized light is exported after the second magneto-optical crystal 2 transmits by the second magneto-optical crystal 2 Linearly polarized light be known as the second deflect light.Second speculum 34 is located at the rear of the second magneto-optical crystal 2, and the second magneto-optical crystal 2 goes out The second deflect light penetrated is reflected after the second speculum 34, and the light after being reflected by the second speculum 34 is known as the second reflected light, Second reflected light is the light after the second deflection light reflection.Second reflected light the second magneto-optical crystal 2 of incidence, the second reflected light is through the Two magneto-optical crystals, 2 rear polarizer direction deflects again, and the deflection angle occurred is still the second deflection angle, by the second reflection The light that light is emitted after the second magneto-optical crystal 2 by the second magneto-optical crystal 2 is known as the second return deflect light.Second returns to deflect light again Secondary is the two orthogonal linearly polarized lights in beam polarization direction by 20 beam splitting of the second polarization beam apparatus through the second polarization beam apparatus 20, Respectively second returns to transmission linearly polarized light and the second return reflection linearly polarized light, and second returns to reflection linearly polarized light by third light Detector 15 receives, and generates third electric signal；Second returns to the right side of the transmission linearly polarized light through the second optical circulator 31 It is exported behind port by the lower port of the second optical circulator 31, the light of output is known as the second return optical circulator and measures light, this second Optical circulator measurement light is returned to be received by the 4th optical detector 16, and generate the 4th electric signal.

Second reflection measurement light by third optical circulator 32 left port incidence third optical circulator 32, and by the third ring of light The light that 32 right output port of third optical circulator exports is known as third optical circulator and measures light by the right output port output of shape device 32.Third Polarization beam apparatus 21 is between third optical circulator 32 and third magneto-optical crystal 3.Third polarization beam apparatus 21 is received from the The third optical circulator of three optical circulators 32 measures light, and generates the two orthogonal linearly polarized lights in beam polarization direction, respectively Third transmits linearly polarized light and third reflection linearly polarized light；Generated here third reflection linearly polarized light (along Figure 10 third Polarization beam apparatus 21 transmits upwards) it is not used in the present embodiment device, therefore no longer refer to.Third transmission linearly polarized light is incident Third magneto-optical crystal 3, third transmits linearly polarized light, and polarization direction deflects during transmission in third magneto-optical crystal 3, i.e.,：Through The polarization direction of the linearly polarized light of three magneto-optical crystals 3 outgoing is compared with the polarization direction of third transmission linearly polarized light, between the two Differ a third deflection angle；Third transmission linearly polarized light is exported after third magneto-optical crystal 3 transmits by third magneto-optical crystal 3 Linearly polarized light be known as third deflect light.Third speculum 35 is located at the rear of third magneto-optical crystal 3, and third magneto-optical crystal 3 goes out The third deflect light penetrated is reflected after third speculum 35, and the light after being reflected by third speculum 35 is known as third reflected light, Third reflected light is the light after third deflection light reflection.Third reflected light incidence third magneto-optical crystal 3, third reflected light is through Three magneto-optical crystals, 3 rear polarizer direction deflects again, and the deflection angle occurred is still third deflection angle, third reflected light The light being emitted after third magneto-optical crystal 3 by third magneto-optical crystal 3 is known as third and returns to deflect light.Third returns to deflect light again It is the two orthogonal linearly polarized lights in beam polarization direction by 21 beam splitting of third polarization beam apparatus through third polarization beam apparatus 21, point Not Wei third return transmission linearly polarized light and third return reflection linearly polarized light, third return reflection linearly polarized light visited by the 5th light Device 17 is surveyed to receive, and generates the 5th electric signal；Third returns to transmission right end of the linearly polarized light through third optical circulator 32 It is exported after mouthful by the lower port of third optical circulator 32, the light of output is known as third and returns to optical circulator measurement light, which returns Light echo circulator measures light and is received by the 6th optical detector 18, and generates the 6th electric signal.

Signal processing circuit respectively with the first optical detector 13, the second optical detector 14, third optical detector 15, the 4th light Detector 16, the 5th optical detector 17 and the 6th optical detector 18 connect, and signal processing circuit is received from six optical detectors Electric signal, and the first transmission linearly polarized light is calculated twice through the first magneto-optical crystal according to the first electric signal and the second electric signal The deflection angle that 1 rear polarizer direction is occurred, the deflection angle are two times of the first deflection angle；According to third electric signal and the 4th telecommunications Number calculate the deflection angle that the second transmission linearly polarized light is occurred twice through 2 rear polarizer direction of the second magneto-optical crystal, the deflection angle Two times for the second deflection angle；Third is calculated according to the 5th electric signal and the 6th electric signal and transmits linearly polarized light twice through third The deflection angle that 3 rear polarizer direction of magneto-optical crystal is occurred, the deflection angle are two times of third deflection angle；Further according to the first deflection Angle, the second deflection angle and third deflection angle calculate the electric current in conductor.

Linearly polarized light is made to pass twice through magneto-optical crystal in the present embodiment so that the angle of polarization direction deflection doubles, The sensitivity of measurement can be improved in this way.

In above example, the first magneto-optical crystal 1, the second magneto-optical crystal 2 and third magneto-optical crystal 3 are in the same of conductor 4 Side, the first magneto-optical crystal 1, the second magneto-optical crystal 2 and third magneto-optical crystal 3 can also be separately positioned on conductor in other embodiment Not homonymy.But ensure：First magneto-optical crystal 1 is parallel with the second magneto-optical crystal 2, and distance of the two away from conductor is different；The Three magneto-optical crystals 3 and the first magneto-optical crystal 1 and the second magneto-optical crystal 2 are not parallel, and distance of the third magneto-optical crystal 3 away from conductor It is equal with the first magneto-optical crystal 1 or the second distance of the magneto-optical crystal 2 away from conductor.First magneto-optical crystal 1,2 and of the second magneto-optical crystal The relative position of 3 three of third magneto-optical crystal immobilizes.

Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited All should be considered as the range that this specification is recorded in contradiction.

Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims

1. a kind of method that conductor current is measured using magneto-optic memory technique, it is characterized in that, include the following steps：

A, the first magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic memory technique is made to distinguish counter conductor and place, and three magneto-optics The relative position of material immobilizes；First magneto-optic memory technique is parallel with the second magneto-optic memory technique, but not parallel with third magneto-optic memory technique； Distance of first magneto-optic memory technique away from conductor is less than distance of second magneto-optic memory technique away from conductor, distance of the third magneto-optic memory technique away from conductor It is equal with distance of first magneto-optic memory technique away from conductor or equal with distance of second magneto-optic memory technique away from conductor；

B, light source is set；The light that light source is sent out is made to be changed into three beams polarised light, respectively the first polarised light, the second polarised light and Three polarised lights；The first polarised light is made to pass through the first magneto-optic memory technique, the second polarised light is made to pass through the second magneto-optic memory technique, polarizes third Light thang-kng third magneto-optic memory technique；

C, the first deflection angle that the first polarised light is deflected by light beam polarization direction after the first magneto-optic memory technique is measured, measure The second deflection angle that second polarised light is deflected by light beam polarization direction after the second magneto-optic memory technique, measure third polarised light The third deflection angle to be deflected by light beam polarization direction after third magneto-optic memory technique；

2. it is a kind of using magneto-optic memory technique measure conductor current device, including the first magneto-optic memory technique, the second magneto-optic memory technique, light source, First analyzer and the second analyzer；First magneto-optic memory technique and the equal counter conductor of the second magneto-optic memory technique and place, and Distance of second magneto-optic memory technique away from conductor is more than distance of first magneto-optic memory technique away from conductor；The light source is used to generate a branch of measurement Light；First analyzer is for emergent light of the reception from first magneto-optic memory technique；Second analyzer is used to receive Emergent light from second magneto-optic memory technique；

It is characterized in that second magneto-optic memory technique is parallel with first magneto-optic memory technique；It is described to measure conductor using magneto-optic memory technique The device of electric current further includes：

Third magneto-optic memory technique, counter conductor and place；Third magneto-optic memory technique and the first magneto-optic memory technique and the second magneto-optic memory technique are not It is parallel, and distance of the third magneto-optic memory technique away from conductor it is equal with distance of first magneto-optic memory technique away from conductor or with the second magneto-optic memory technique Distance away from conductor is equal；The relative position of first magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic memory technique three is fixed not Become；

Polarization beam-splitting unit is three beams polarised light for receiving a branch of measurement light of the light source generation and beam splitting, and three beams polarizes Incident first magneto-optic memory technique of light difference, second magneto-optic memory technique and the third magneto-optic memory technique；

First optical detector for receiving the analyzing output light from first analyzer, and generates first electric signal；

Second optical detector for receiving the analyzing output light from second analyzer, and generates second electric signal；

Third optical detector for receiving the analyzing output light from the third analyzer, and generates a third electric signal； And

Signal processing circuit, respectively with first optical detector, second optical detector and the third optical detector phase It connects, for receiving first electric signal, second electric signal and the third electric signal, and according to the electric signal received Calculate the electric current in conductor.

3. the device according to claim 2 that conductor current is measured using magneto-optic memory technique, it is characterized in that, the polarization beam splitting Unit includes the polarizer, the first beam splitter and the second beam splitter；The polarizer is used to receive the measurement light that the light source generates And a branch of polarised light is exported, first beam splitter is used for a branch of polarized light beam splitting for exporting the polarizer and is polarized for two beams Light, second beam splitter is used for the wherein a branch of polarised light for exporting first beam splitter, and beam splitting is polarized for two beams again Light.

4. the device according to claim 2 that conductor current is measured using magneto-optic memory technique, it is characterized in that, the polarization beam splitting Unit includes the first beam splitter, the second beam splitter, first polarizer, second polarizer and the third polarizer；First beam splitting Device is used for a branch of measurement light beam splitting for generating the light source and measures light for two beams, and first beam splitter exports wherein a branch of It measures light and is changed into a branch of polarised light after first polarizer, another beam of the first beam splitter output measures light through institute Light is measured for two beams by beam splitting again after stating the second beam splitter；Described in wherein a branch of measurement light warp of the second beam splitter output It is changed into a branch of polarised light after second polarizer, another beam of the second beam splitter output measures light through the third polarizer After be changed into a branch of polarised light.

5. the device according to claim 2 that conductor current is measured using magneto-optic memory technique, it is characterized in that, the polarization beam splitting Unit includes the first polarization beam apparatus and the second polarization beam apparatus；First polarization beam apparatus is used for generate the light source A branch of measurement light beam splitting is the two orthogonal polarised lights in beam polarization direction, and second polarization beam apparatus is used for described first Beam splitting is the two orthogonal polarised lights in beam polarization direction to wherein a branch of polarised light of polarization beam apparatus output again.

6. a kind of device that conductor current is measured using magneto-optic memory technique, including the first magneto-optic memory technique, the second magneto-optic memory technique and light source； First magneto-optic memory technique and the equal counter conductor of the second magneto-optic memory technique and place, and distance of second magneto-optic memory technique away from conductor More than distance of first magneto-optic memory technique away from conductor；The light source is used to generate a branch of measurement light；

First polarization beam-splitting unit, for receiving a branch of measurement light that the light source generates and beam splitting is three beams polarised light, three beams Incident first magneto-optic memory technique of polarised light difference, second magneto-optic memory technique and the third magneto-optic memory technique；

Second polarization beam-splitting unit, for receiving the emergent light from first magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

Third polarization beam-splitting unit, for receiving the emergent light from second magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

4th polarization beam-splitting unit, for receiving the emergent light from the third magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

First optical detector and the second optical detector, the two receive the two beams polarization from second polarization beam-splitting unit respectively Light, and the first electric signal and the second electric signal are generated respectively；

Third optical detector and the 4th optical detector, the two receive the two beams polarization from the third polarization beam-splitting unit respectively Light, and third electric signal and the 4th electric signal are generated respectively；

5th optical detector and the 6th optical detector, the two receive the two beams polarization from the 4th polarization beam-splitting unit respectively Light, and the 5th electric signal and the 6th electric signal are generated respectively；And

Signal processing circuit, respectively with first optical detector, second optical detector, the third optical detector, institute The 4th optical detector, the 5th optical detector and the 6th optical detector is stated to connect, for receive first electric signal, Second electric signal, the third electric signal, the 4th electric signal, the 5th electric signal and the 6th electric signal, And the electric current in conductor is calculated according to the electric signal received.

7. the device according to claim 6 that conductor current is measured using magneto-optic memory technique, it is characterized in that, second polarization Beam splitting unit, the third polarization beam-splitting unit and the 4th polarization beam-splitting unit are polarization beam apparatus or Wollaston rib Mirror.

8. the device according to claim 7 that conductor current is measured using magneto-optic memory technique, it is characterized in that, second polarization Beam splitting unit is the first Wollaston prism, and the third polarization beam-splitting unit is the second Wollaston prism, and the described 4th partially The beam splitting unit that shakes is third Wollaston prism；In first Wollaston prism, second Wollaston prism and institute The rear end for stating third Wollaston prism is both provided with double-fiber collimator, and first optical detector and second light are visited It surveys device and the optical signal from first Wollaston prism, the third optical detector and described the is received by optical fiber respectively Four optical detectors respectively by optical fiber receive the optical signal from second Wollaston prism, the 5th optical detector and 6th optical detector receives the optical signal from the third Wollaston prism by optical fiber respectively.

9. a kind of device that conductor current is measured using magneto-optic memory technique, including the first magneto-optic memory technique, the second magneto-optic memory technique and light source； First magneto-optic memory technique and the equal counter conductor of the second magneto-optic memory technique and place, and distance of second magneto-optic memory technique away from conductor More than distance of first magneto-optic memory technique away from conductor；The light source is used to generate a branch of measurement light；

Third magneto-optic memory technique, counter conductor and place；Third magneto-optic memory technique is vertical with the first magneto-optic memory technique, and third magneto-optic memory technique Distance away from conductor is equal with distance of first magneto-optic memory technique away from conductor or equal with distance of second magneto-optic memory technique away from conductor；The The relative position of one magneto-optic memory technique, the second magneto-optic memory technique and third magneto-optic memory technique three immobilizes；

First polarization beam apparatus is that two beam polarization directions are mutually hung down for receiving a branch of measurement light of the light source generation and beam splitting Straight polarised light, respectively the first transmission-polarizing light and the first polarization by reflection light；

Corner cube mirror, the first polarization by reflection light for being exported to first polarization beam apparatus carry out right angle reflection, so that Light beam after reflection is parallel to the first transmission-polarizing light of the first polarization beam apparatus output；It is reflected through the corner cube mirror Incident first magneto-optic memory technique of light beam afterwards；

Second polarization beam apparatus is two beams for receiving the first transmission-polarizing light of the first polarization beam apparatus output and beam splitting The orthogonal polarised light in polarization direction, respectively the second transmission-polarizing light and the second polarization by reflection light；Second transmission is inclined Incident second magneto-optic memory technique of the light that shakes, the incident third magneto-optic memory technique of the second polarization by reflection light；

First Wollaston prism, for receiving the emergent light from first magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

Second Wollaston prism, for receiving the emergent light from second magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

Third Wollaston prism, for receiving the emergent light from the third magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

First optical detector and the second optical detector, the two receive the two beams polarization from first Wollaston prism respectively Light, and the first electric signal and the second electric signal are generated respectively；

Third optical detector and the 4th optical detector, the two receive the two beams polarization from second Wollaston prism respectively Light, and third electric signal and the 4th electric signal are generated respectively；

5th optical detector and the 6th optical detector, the two receive the two beams polarization from the third Wollaston prism respectively Light, and the 5th electric signal and the 6th electric signal are generated respectively；And

Signal processing circuit, respectively with first optical detector, second optical detector, the third optical detector, institute The 4th optical detector, the 5th optical detector and the 6th optical detector is stated to connect, for receive first electric signal, Second electric signal, the third electric signal, the 4th electric signal, the 5th electric signal and the 6th electric signal, And the electric current in conductor is calculated according to the electric signal received；

First polarization beam apparatus, the corner cube mirror, second polarization beam apparatus, first magneto-optic memory technique, institute State the second magneto-optic memory technique, the third magneto-optic memory technique, first Wollaston prism, second Wollaston prism and institute State third Wollaston prism one optical device integrated unit of formation glued together.

10. a kind of device that conductor current is measured using magneto-optic memory technique, including the first magneto-optic memory technique, the second magneto-optic memory technique and light Source；First magneto-optic memory technique and the equal counter conductor of the second magneto-optic memory technique and place, and the second magneto-optic memory technique is away from conductor Distance is more than distance of first magneto-optic memory technique away from conductor；The light source is used to generate a branch of measurement light；

First beam splitter, for receiving a branch of measurement light that the light source generates and beam splitting measures light for two beams, respectively first Transmission measurement light and the first reflection measurement light；

Second beam splitter is that two beams measure light for receiving the first reflection measurement light of the first beam splitter output and beam splitting, Respectively the second transmission measurement light and the second reflection measurement light；

Third optical circulator, for receiving the second reflection measurement light from second beam splitter and exporting a third Optical circulator measures light；

First polarization beam apparatus measures light, and produce for receiving the first optical circulator exported from first optical circulator A raw first transmission-polarizing light；Incident first magneto-optic memory technique of the first transmission-polarizing light, first transmission-polarizing Light deflects to form the first deflect light through the first magneto-optic memory technique rear polarizer direction；

Second polarization beam apparatus measures light, and produce for receiving the second optical circulator exported from second optical circulator A raw second transmission-polarizing light；Incident second magneto-optic memory technique of the second transmission-polarizing light, second transmission-polarizing Light deflects to form the second deflect light through the second magneto-optic memory technique rear polarizer direction；

Third polarization beam apparatus measures light, and produce for receiving the third optical circulator exported from the third optical circulator A raw third transmission-polarizing light；The incident third magneto-optic memory technique of the third transmission-polarizing light, the third transmission-polarizing Light deflects to form third deflect light through the third magneto-optic memory technique rear polarizer direction；

First speculum, the first deflect light for being exported to first magneto-optic memory technique carry out reflecting to form the first reflected light, Incident first magneto-optic memory technique of first reflected light；First reflected light is through the first magneto-optic memory technique rear polarizer direction It deflects to form the first return deflect light, it is inclined that the first return deflect light forms two beams after first polarization beam apparatus Shake the orthogonal polarised light in direction, the respectively first return transmission-polarizing light and the first return polarization by reflection light, and described first It returns to transmission-polarizing light and the first return optical circulator measurement light is formed after first optical circulator；

Second speculum, the second deflect light for being exported to second magneto-optic memory technique carry out reflecting to form the second reflected light, Incident second magneto-optic memory technique of second reflected light；Second reflected light is through the second magneto-optic memory technique rear polarizer direction It deflects to form the second return deflect light, it is inclined that the second return deflect light forms two beams after second polarization beam apparatus Shake the orthogonal polarised light in direction, and respectively second, which returns to transmission-polarizing light and second, returns to polarization by reflection light；Described second It returns to transmission-polarizing light and the second return optical circulator measurement light is formed after second optical circulator；

Third speculum, the third deflect light for being exported to the third magneto-optic memory technique carry out reflecting to form third reflected light, The incident third magneto-optic memory technique of the third reflected light；The third reflected light is through the third magneto-optic memory technique rear polarizer direction It deflects to form third return deflect light, it is inclined that the third return deflect light forms two beams after the third polarization beam apparatus Shake the orthogonal polarised light in direction, and respectively third returns to transmission-polarizing light and third returns to polarization by reflection light；The third It returns to transmission-polarizing light and third return optical circulator measurement light is formed after the third optical circulator；

First optical detector is returned for receiving export from first polarization beam apparatus first and polarization by reflection light and is generated First electric signal；

Second optical detector measures light from the first return optical circulator that first optical circulator exports for reception and produces Raw second electric signal；

Third optical detector is returned for receiving export from second polarization beam apparatus second and polarization by reflection light and is generated Third electric signal；

4th optical detector measures light from the second return optical circulator that second optical circulator exports for reception and produces Raw 4th electric signal；

5th optical detector returns to polarization by reflection light from the third that the third polarization beam apparatus exports for reception and generates 5th electric signal；

6th optical detector returns to optical circulator measurement light from the third that the third optical circulator exports for reception and produces Raw 6th electric signal；And