CN106291040A - Magneto-opitcal current transducer - Google Patents
Magneto-opitcal current transducer Download PDFInfo
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- CN106291040A CN106291040A CN201610594810.3A CN201610594810A CN106291040A CN 106291040 A CN106291040 A CN 106291040A CN 201610594810 A CN201610594810 A CN 201610594810A CN 106291040 A CN106291040 A CN 106291040A
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- magneto
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The present invention relates to optical current sensor field, be specifically related to a kind of magneto-opitcal current transducer.The magneto-opitcal current transducer of the present invention includes: laser instrument, 3 × 3 bonders, polarization maintaining optical fibre, magneto-optic module, ring concentrator, phase demodulator；Described magneto-optic module includes first collimator, the second collimator, polaroid, λ/4 wave plate, the 2nd λ/4 wave plate, transparent phosphor；Described transparent phosphor is cuboid, and the two ends of described transparent phosphor are completely reflecting mirror, and described completely reflecting mirror is 45 ° with the angle of the major axis of described transparent phosphor.The magneto-opitcal current transducer of the present invention, based on magnetic rotation effect (MCB), by detecting the phase contrast of two-way closed loop light, the size of power frequency alternating current in indirect detection power transmission line, improves the stability of accuracy of detection and device.
Description
Technical field
The present invention relates to optical current sensor field, be specifically related to a kind of magneto-opitcal current transducer.
Background technology
Along with constantly increasing of power transmission capabilities and improving constantly of line voltage, pass in high pressure, supergrid
The induction structure of system the most gradually exposes many defects, such as: insulation measures is complicated, bulky, there is the wind of blast
By inches, anti-electromagnetic capability is poor, certainty of measurement is low, is day by day substituted by the smallest and the most exquisite safe The Rogowski Optical Current Transformer.Photo-electric
Current transformer is broadly divided into active type, passive and full fiber type 3 class.
Active type photoelectric current inductor is that the signal of telecommunication is passed to luminescence by sampling coil by high voltage side current signal
Element and become optical signal, then be delivered to low potential side by optical fiber, carry out amplifying output after inversion changes the signal of telecommunication into.High-pressure side electricity
The power source of sub-device is in optical functions mode, bus current power supply mode, battery power supply mode and ultrasonic-frequency power supply supplier of electricity
Formula.Active type is structure relatively in early days, and its advantage is simple in construction, and long-time stability are preferable, in modern electronic devices reliability
Being easily achieved precision height under conditions of height, stable performance, export big practicality product, its shortcoming is sampled signal top structure
More complicated, sensing head is positioned under high-voltage great-current environment easily by electromagnetic interference, easily damaged.
The sensing head part of passive photoelectric current inductor need not power supply.Sensing head common usage draws magneto-optic
Effect principle is made, and is in the polarized light that the light source of electronegative potential sends and passes to high-pressure side through optical fiber, and by being in tested electric current
In the magnetic field produced.The plane of polarization of polarized light rotates in magneto-optic glass, i.e. current signal Polarization Modulation light wave.Belt current
The light wave of signal passes to earth potential side through optical fiber, amplifies output after light-to-current inversion.Passive structure is the most more to contain
Row, its advantage is simple in construction, and completely eliminates traditional electromagnetic induction element, without magnetic saturation problem, gives full play to
The feature of photo-electricity mutual-inductor, especially high-pressure side Powerless electronic device, without temperature stability issues, transformer service life is held
Easily ensure.Its shortcoming is that optics manufacture difficulty is big, and the high accuracy of measurement is difficult to, and long-time stability there is also and ask
Topic.
Full fiber type photoelectric current inductor reality is also passive, and simply sensing head is i.e. by the ring-type sense of optical fiber fabrication
Answering device, remaining is just the same with passive.The advantage of full fiber type photoelectric current inductor is that transducing head structure is the simplest, than
Passive is easily fabricated, elasto-optical effect, linear birefrigence and other photo effect etc. such as shortcoming such as optical fiber itself and optical fiber coiling,
The precision and stability that impact is measured.
Utilization is all had with upper type, some hanging net operation, but to not obtaining on China's electric power network so far
Success popularization and application.
Summary of the invention
For defect of the prior art, the magneto-opitcal current transducer that the present invention provides, based on transparent magneto-optic memory technique mangneto
Rotation effect (MCB), by detecting the phase contrast of two-way closed loop light, the size of power frequency alternating current in indirect detection power transmission line,
Improve accuracy of detection and stability.
First aspect, a kind of magneto-opitcal current transducer, it is characterised in that including: laser instrument, 3 × 3 bonders, the first guarantor
Polarisation fibre, the second polarization maintaining optical fibre, magneto-optic module, ring concentrator, phase demodulator；Described magneto-optic module include first collimator,
Two collimators, polaroid, λ/4 wave plate, the 2nd λ/4 wave plate, transparent phosphor；Described transparent phosphor is cuboid, institute
The two ends of the long axis direction stating transparent phosphor are completely reflecting mirror, the folder of the major axis of described completely reflecting mirror and described transparent phosphor
Angle is 45 °；The major axis of described transparent phosphor is parallel with the magnetic direction of described ring concentrator；Described laser instrument and described 3 × 3 couplings
First port of clutch connects；Second port of described 3 × 3 bonders, described first polarization maintaining optical fibre, described first collimator,
Described polaroid, described λ/4 wave plate are sequentially connected with；3rd port of described 3 × 3 bonders, described second polarization maintaining optical fibre,
Described second collimator, described polaroid, described 2nd λ/4 wave plate are sequentially connected with；Described first polarization maintaining optical fibre is axial or slow soon
Axially, described second polarization maintaining optical fibre is soon axially or slow axis is consistent to, described polaroid polarization direction；Described λ/4 wave plate
Fast axially or slow axis to described 2nd λ/4 wave plate fast axially or slow axis is to mutually orthogonal, and polaroid polarization direction is positioned at
The fast axle of the fast axle of described λ/4 wave plate or slow axis and described 2nd λ/4 wave plate or the orthogonal angle bisector of slow axis；Described
One λ/4 wave plates output left circularly polarized light, described 2nd λ/4 wave plate output right-circularly polarized light, described left circularly polarized light and
The direction of rotation of described right-circularly polarized light is in opposite directions；Described left circularly polarized light and described right-circularly polarized light are respectively perpendicular to institute
The major axis stating transparent phosphor is incident, through the light path return of the completely reflecting mirror reflection tailing edge the other side at described transparent phosphor two ends,
Respectively enteing the 4th port and fifth port of described 3 × 3 bonders, Differential Output gives described phase demodulator；Described phase place
Demodulator carries out opto-electronic conversion for the light exported described 4th port and described fifth port respectively, obtains the first of correspondence
The road signal of telecommunication and the second road signal of telecommunication；The described first via signal of telecommunication and the described second road signal of telecommunication are carried out additive operation, subtraction
Computing, differentiate, the result of differentiating of differentiate result and the difference of sum is carried out multiplication cross, the sum to two multiplication cross results
It is integrated computing, finally gives phase demodulating output result.
The magneto-opitcal current transducer that the present invention provides, makes based on magnetic rotation effect, belongs to passive photoelectric current mutual
, there is not high-voltage electromagnetic interference or the puzzlement of high-voltage breakdown, and avoid the linear birefrigence impact on system accuracy in sensor；
Light path in transparent phosphor is parallel to the magnetic direction in ring concentrator, is conducive to strengthening magneto-optic effect, improves the spirit of detection
Sensitivity；Utilize symmetrical, closed loop double photo paths mode, form two-way balance interference of light by 33 bonders, demodulate two-way
The phase contrast of light.Significantly improve LASER Light Source output instability, the change of ambient temperature, external shock, optics ginseng
The impact on certainty of measurement such as number change；33 coupler phase demodulation methods, compared to other demodulation techniques, its great advantage
For being not required to any modulation device, demodulated signal dynamic range is big, highly sensitive, simple in construction.
Preferably, described transparent phosphor has strong magneto-optic effect coefficient.
Preferably, the material of described ring concentrator is the magnetic material of nanometer high permeability.
Preferably, described ring concentrator includes two full symmetric collection magnetic semi-rings, and one end of two described collection magnetic semi-rings has
Seam docking, between other end termination, described magneto-optic module is installed in gap.
Preferably, termination, one end shape in gradient that described collection magnetic semi-ring does not docks.
Second aspect, the another kind of magneto-opitcal current transducer that the present invention provides, including: laser instrument, 2 × 2 bonders, guarantor are partially
Optical fiber, one-to-two optical fiber splitter, magneto-optic module, ring concentrator, demodulation of frequency discriminator device；Described magneto-optic module include first collimator,
Second collimator, polaroid, λ/4 wave plate, the 2nd λ/4 wave plate, transparent phosphor；Described transparent phosphor is cuboid,
The two ends of the long axis direction of described transparent phosphor are completely reflecting mirror, the major axis of described completely reflecting mirror and described transparent phosphor
Angle is 45 °；The major axis of described transparent phosphor is parallel with the magnetic direction of described ring concentrator；Described laser instrument and described 2 × 2
First port of bonder connects；Second port of described 2 × 2 bonders, described polarization maintaining optical fibre, described one-to-two fiber optic splitter
Device first input port, described one-to-two optical fiber splitter input the second port, described first collimator, described polaroid, institute
State λ/4 wave plate to be sequentially connected with；Described one-to-two optical fiber splitter the 3rd port, described second collimator, described polaroid,
Described 2nd λ/4 wave plate is sequentially connected with；The fast axle of described polarization maintaining optical fibre or slow axis are consistent to, polaroid polarization direction；Described first
The fast axle of λ/4 wave plate or slow axis to the fast axle or slow axis with described 2nd λ/4 wave plate to mutually orthogonal, and polaroid polarization direction
It is positioned at fast axle or the orthogonal angle bisector of slow axis of the fast axle of described λ/4 wave plate or slow axis and described 2nd λ/4 wave plate；Institute
State a λ/4 wave plate output left circularly polarized light, described 2nd λ/4 wave plate output right-circularly polarized light, described Left-hand circular polarization
The direction of rotation of light and described right-circularly polarized light is in opposite directions；Described left circularly polarized light and described right-circularly polarized light are respectively perpendicular
Incident in the major axis of described transparent phosphor, the light path reflecting tailing edge the other side through the completely reflecting mirror at described transparent phosphor two ends is returned
Return, be closed to one-to-two optical fiber splitter, formed after interfering defeated through the 3rd port of described polarization maintaining optical fibre, described 2 × 2 bonders
Go out to demodulation of frequency discriminator device；Described demodulation of frequency discriminator device is for being used for spectrum to the optical signal of described 2 × 2 bonder the 3rd port outputs
Instrument demodulates or carries out opto-electronic conversion, demodulation of frequency discriminator output, analog digital conversion, Digital Signal Processing, finally gives demodulation output result.
The magneto-opitcal current transducer that the present invention provides, makes based on magnetic rotation effect, belongs to passive photoelectric current mutual
, there is not high-voltage electromagnetic interference or the puzzlement of high-voltage breakdown, and avoid the linear birefrigence impact on system accuracy in sensor；
Light path in transparent phosphor is parallel to the magnetic direction in ring concentrator, is conducive to strengthening magneto-optic effect, improves the spirit of detection
Sensitivity；Symmetry, closed loop double light path, single polarization maintaining optical fibre, sensing field is utilized to complete the detection mode interfered；Directly pass through spectrogrph
Demodulation or the mode of demodulation of frequency discriminator.Significantly improve LASER Light Source output instability, the change of ambient temperature, external shock,
The impact on certainty of measurement such as optics Parameters variation；Demodulated signal dynamic range is big, highly sensitive, simple in construction.
Preferably, described transparent phosphor has strong magneto-optic effect coefficient.
Preferably, the material of described ring concentrator is the magnetic material of nanometer high permeability.
Preferably, described ring concentrator includes two full symmetric collection magnetic semi-rings, and one end of two described collection magnetic semi-rings has
Seam docking, between other end termination, described magneto-optic module is installed in gap.
Preferably, termination, one end shape in gradient that described collection magnetic semi-ring does not docks.
Accompanying drawing explanation
Fig. 1 shows the structured flowchart of the magneto-opitcal current transducer that the embodiment of the present invention provided；
Fig. 2 shows the application scenarios of the magneto-opitcal current transducer that the embodiment of the present invention provided；
Fig. 3 shows the structured flowchart of the another kind of magneto-opitcal current transducer that the embodiment of the present invention provided.
In accompanying drawing, 1-laser instrument；2-3 × 3 bonder；3-polarization maintaining optical fibre；31-the first polarization maintaining optical fibre；32-second protects polarisation
Fine；4-one-to-two optical fiber splitter；5-magneto-optic module；6-ring concentrator；7-power transmission line；8-phase demodulator；9-demodulation of frequency discriminator device；
10-2 × 2 bonder；11-main frame；
51-first collimator；52-the second collimator；53-polaroid；54-the oneth λ/4 wave plate；55-the 2nd λ/4 wave plate；
The transparent phosphor of 56-；57-completely reflecting mirror.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of technical solution of the present invention is described in detail.Following example are only used for
Technical scheme is clearly described, is therefore intended only as example, and the protection of the present invention can not be limited with this
Scope.
It should be noted that except as otherwise noted, technical term used in this application or scientific terminology should be this
The ordinary meaning that bright one of ordinary skill in the art are understood.
When line polarized light is propagated in media as well, if adding a high-intensity magnetic field, then light vibration on the direction of propagation be parallel to light
Direction will deflect, and deflection angle θ is directly proportional to the product of length L that magnetic induction density B and light pass through medium, i.e. and θ=
VBL, proportionality coefficient V are referred to as Verdet constant, relevant with magnet-optical medium character and frequency of light wave.Yawing moment depends on medium
Matter and magnetic direction.Above-mentioned phenomenon is referred to as Faraday effect or magnetic rotation effect.
When magnetisable material magnetizes under additional the action of a magnetic field, the refractive index of magneto-optic material itself causes magnetic double refraction
(magnectic birfringgence) effect, i.e. its dextrorotation refractive index and left-handed refractive index differ so that left-handed shake light and
It is different that right-handed polarized light propagates phase velocity, and two kinds of light produce phase contrast, and magneto-optic memory technique is to left-handed light and the right-handed polarized light of shaking simultaneously
The difference of absorptance.Same phase can be decomposed into for line polarized light, with amplitude left-hand polarization light and right-handed polarized light, based on
Two kinds of light after both the above phase contrast and amplitude difference synthesis will be superimposed as a branch of having certain ellipse inclined rate and deflection angle
Elliptically polarized light.
Faraday's deflection angle theta=VBL=π L/ λ (nl-nr), wherein λ is optical wavelength, nl and nr is left-hand polarization respectively
Light and the refractive index of right-handed polarized light, and modulated by magnetic field intensity B.
As it is shown in figure 1, a kind of magneto-opitcal current transducer that the embodiment of the present invention provides, including: laser instrument 1,3 × 3 couples
Device the 2, first polarization maintaining optical fibre the 31, second polarization maintaining optical fibre 32, magneto-optic module 5, ring concentrator 6, phase demodulator 8；Magneto-optic module includes
First collimator the 51, second collimator 52, polaroid the 53, the oneth λ/4 wave plate the 54, the 2nd λ/4 wave plate 55, transparent phosphor 56；
Transparent phosphor 56 is cuboid, and the two ends of the long axis direction of transparent phosphor 56 are completely reflecting mirror 57, and completely reflecting mirror 57 is with saturating
The angle of the major axis of bright phosphor 56 is 45 °；The major axis of transparent phosphor 56 is parallel with the magnetic direction in ring concentrator 6；Laser
Device 1 is connected with the first port of described 3 × 3 bonders 2；Second port of 3 × 3 bonders 2, the first polarization maintaining optical fibre 31, first
Collimator 51, polaroid the 53, the oneth λ/4 wave plate 54 are sequentially connected with；3rd port of 3 × 3 bonders 2, the second polarization maintaining optical fibre 32,
Second collimator 52, polaroid the 53, the 2nd λ/4 wave plate 55 are sequentially connected with；The fast axle (or slow axis) and second of the oneth λ/4 wave plate 54
The fast axle (or slow axis) of λ/4 wave plate 55 is orthogonal and at 45 ° with polaroid 53 respectively；The light vertical incidence of first collimator 51 output
Polaroid 53 and λ/4 wave plate 54, output left (or right) rounding polarized light；The light vertical incidence of the second collimator 52 output is inclined
Shake sheet 53 and the 2nd λ/4 wave plate 55, output right (or left) rounding polarized light；Left circularly polarized light and right-circularly polarized light hang down respectively
Directly the major axis in transparent phosphor 56 is incident, and the light path reflecting tailing edge the other side through the completely reflecting mirror 57 at transparent phosphor 56 two ends is returned
Returning, the 4th port and fifth port by 3 × 3 bonders 2 export to phase demodulator 8 respectively；Phase demodulator 8 is for dividing
The light of other the 4th port to 3 × 3 bonders 2 and fifth port output carries out opto-electronic conversion and obtains the first via signal of telecommunication of correspondence
With the second road signal of telecommunication, the first via signal of telecommunication and the second road signal of telecommunication are carried out additive operation, subtraction, differentiate, will
The result of differentiating of differentiate result and the difference of sum carries out multiplication cross, to two multiplication cross results and be integrated computing,
Obtain phase demodulating output result eventually.
During as in figure 2 it is shown, above-mentioned magneto-opitcal current transducer uses, power transmission line 7 is through ring concentrator 6, and once power transmission line 7 contains
When having alternation power current, the corresponding sensing alternating magnetic field that produces in ring concentrator 6, and the transparent magneto-optic of the gap location through ring concentrator 6
Body 56 forms closed magnetic circuit.Due to the magnetic rotation effect of transparent phosphor 56, the left-handed circle propagated in transparent phosphor 56
The phase velocity of polarized light and right-circularly polarized light is modulated by magnetic field intensity in ring concentrator respectively, the left circularly polarized light after modulation
With the power current generation in the strength information that right-hand circular polarization light phase carries additional alternating magnetic field respectively, i.e. ring concentrator 6
The information of alternating magnetic field intensity.Therefore, by two-way light after transparent phosphor 56 with the power current size of power transmission line 7
Information.
The work process of above-mentioned magneto-opitcal current transducer is: the light of laser instrument 1 output enters two-way through 3 × 3 bonders 2
Polarization maintaining optical fibre, two-way light passes through polarization maintaining optical fibre balanced input magneto-optic module 5, these two-way light amplitude size, polarization states etc. complete one
Cause, i.e. the polarization direction of line polarized light of laser instrument output, the first polarization maintaining optical fibre 31 fast axle (or slow axis) direction, second guarantor's polarisation
Fast axle (or slow axis) direction, polaroid 53 polarization direction of fine 32 are substantially parallel, and this two-way light is respectively through collimator, polarization
Becoming a road left circularly polarized light and a road right-circularly polarized light after sheet, λ/4 wave plate, this two-way light impinges perpendicularly on transparent simultaneously
In phosphor 56, after the completely reflecting mirror 57 through transparent phosphor 56 two ends reflects respectively, the direction of propagation of two-way light all changes
90 °, and go in the same direction along the long axis direction of transparent phosphor 56, after the completely reflecting mirror 57 of transparent phosphor 56 other end reflects
Two-way light continue along the other side light path return, exported to phase demodulator 8 by 3 × 3 bonders 2.From 3 × 3 bonders 2
The phase place of the two-way light of output comprises the magnetic field intensity information linear with the size of current being detected power transmission line, by phase
Position demodulator 8 detects and relevant phase information.
Double light path, two-way, symmetrical and closed loop detection mode significantly improve that LASER Light Source output is unstable, ambient temperature
Change, external shock, the impact on certainty of measurement such as optics Parameters variation, be effectively improved the anti-dry of detection equipment
Disturb ability, stability, concurrently facilitate and improve final accuracy of detection.
Wherein, 3 × 3 bonders use balance Phase Demodulation Method of Optic.
Optics, optical signal source and the amplitude pair that the physical arrangement of magneto-optic module 5 and fibre transmission portions is used
Claim consistent.Double light path, Bidirectional closed-loop structure, it is to avoid the line polarized light fast axle that used because of single-side structural mode, slow axis component
The difference of amplitude, the difference of phase place, the rotation etc. of polarization direction, engineering application difficulty, the precision of measurement and stability cannot be protected
Card.
Phase demodulator 8 is by carrying out the computing such as difference, calculus calculate balance, the two-way light of the separate same sex
Phase information, compares single channel light scheme, improves the capacity of resisting disturbance of system, further increases the precision of measurement and stablizes
Property.
The magneto-opitcal current transducer that the embodiment of the present invention provides, magnetic rotation effect based on transparent phosphor, belong to
Strong magneto-optic effect, the sensitivity of measurement, precision height, belong to passive, there is not high-voltage electromagnetic interference or the puzzlement of high-voltage breakdown；?
Light path in transparent phosphor 56 is parallel to the magnetic direction in ring concentrator 6, is conducive to strengthening magneto-optic effect, improves the spirit of detection
Sensitivity；Utilize closed loop double photo paths mode, contribute to improving LASER Light Source output instability, the change of ambient temperature,
The impact on certainty of measurement such as external shock and optics Parameters variation；Use 33 bonder 2 phase demodulating methods, should
Demodulation mode is compared to other demodulation techniques, and its great advantage is for being not required to any modulation device, and demodulated signal dynamic range is big, spirit
Sensitivity is high, simple in construction.
It is internal that laser instrument 1 and phase demodulator 8 are integrated in main frame 11.
The signal of phase demodulator 8 output can also carry out nonlinear temperature benefit by the processor in the main frame 11 of rear end
Repay, mission nonlinear correction measure realizes linearisation, improves further the accurate measurement of alternating current amount in power transmission line.
Transparent phosphor 56 selects the material with strong magneto-optic effect coefficient to make.
Completely reflecting mirror 57 can realize by plating the reflectance coating of high reflecting rate in transparent phosphor 56.
Ring concentrator 6 uses the magnetic material of nanometer high permeability to make, have that good magnetization is Linearity, approximate zero magnetic hysteresis,
Zero coercive rate.As in figure 2 it is shown, ring concentrator 6 is made up of full symmetric two collection magnetic semi-rings, this structure makes the ring concentrator 6 can
Directly power transmission line 7 is assembled or disassembles, it is not necessary to assemble ring concentrator 6 by dismounting power transmission line 7；Two collection magnetic semi-rings assemble
After, wherein a joint is docked completely, installs magneto-optic module 5 at an other play movement, and magnetic circuit is still in closed loop states；Collection magnetic
The trapezoidal shape in end that ring 6 is unsettled, this structure contribute to further by magnetic field concentration in transparent phosphor 56, advantageously reduce
Because other magneto-optic effect such as section Morton effect of pausing is on the impact of other optics in magneto-optic module 5, improves further and measure
Accuracy and sensitivity.
In order to reduce the impact of environmental factors further and protect the impact etc. of change of inclined Transmission Fibers inherent parameters, have
Being beneficial to engineering application, the embodiment of the present invention additionally provides another kind of magneto-opitcal current transducer, as it is shown on figure 3, include: laser instrument 1,
22 bonders 10, polarization maintaining optical fibre 11, one-to-two optical fiber splitter 4, magneto-optic module 5, ring concentrator 6, demodulation of frequency discriminator device 9.
Magneto-optic module includes first collimator the 51, second collimator 52, polaroid the 53, the oneth λ/4 wave plate the 54, the 2nd λ/4
Wave plate 55, transparent phosphor 56；Transparent phosphor 56 is cuboid, and the two ends of the long axis direction of transparent phosphor 56 are total reflection
Mirror 57, completely reflecting mirror 57 is 45 ° with the angle of the major axis of transparent phosphor 56；The major axis of transparent phosphor 56 and described ring concentrator
Magnetic direction in 6 is parallel；One-to-two optical fiber splitter 4 realizes balance branch output and two-way interference of light.
Laser instrument 1 is connected with the first port of 2 × 2 bonders 10；Second port of 2 × 2 bonders 10, polarization maintaining optical fibre
11, one-to-two optical fiber splitter 4 first input port, one-to-two optical fiber splitter 4 second input port, first collimator 51,
Polaroid the 53, the oneth λ/4 wave plate 54 is sequentially connected with；One-to-two optical fiber splitter the 3rd port, the second collimator 52, described polarization
Sheet 53, described 2nd λ/4 wave plate 55 are sequentially connected with；In magneto-optic module 5, the fast axle of polarization maintaining optical fibre 11 or slow axis are inclined to, polaroid 53
The direction that shakes is consistent；The fast axle of the oneth λ/4 wave plate 54 or slow axis to the fast axle or slow axis with described 2nd λ/4 wave plate 55 to the most just
Hand over, and polaroid 53 polarization direction be positioned at a fast axle of λ/4 wave plate 54 and the orthogonal angle bisector of the 2nd fast axle of λ/4 wave plate 55,
Or it is positioned at λ/4 wave plate 54 slow axis and the orthogonal angle bisector of the 2nd λ/4 wave plate 55 slow axis；Oneth λ/4 wave plate 54 exports a left side
(or right) rounding polarized light, the 2nd λ/4 wave plate 55 exports the right side (or left) rounding polarized light, and two circularly polarized light direction of rotation are in opposite directions；
The major axis that left circularly polarized light and right-circularly polarized light are respectively perpendicular to transparent phosphor 56 is incident, through transparent phosphor 56 two ends
Completely reflecting mirror 57 reflect tailing edge the other side light path return, constitute Guan Bi light path, be closed to one-to-two optical fiber splitter 4, formed
Interfere.Loop light respectively enters the 3rd port of 2 × 2 bonders 10, and output is to demodulation of frequency discriminator device 9；Described demodulation of frequency discriminator device 9 is used
Optical signal in the 3rd port output to described 2 × 2 bonders 10 carries out spectrogrph demodulation or carries out opto-electronic conversion, frequency discrimination solution
Adjust output, analog digital conversion, Digital Signal Processing, finally give demodulation output result.
During as in figure 2 it is shown, above-mentioned magneto-opitcal current transducer uses, power transmission line 7 is through ring concentrator 6, and once power transmission line 7 contains
When having alternation power current, the corresponding sensing alternating magnetic field that produces in ring concentrator 6, and the transparent magneto-optic of the gap location through ring concentrator 6
Body 56 forms closed magnetic circuit.Due to the magnetic rotation effect of transparent phosphor 56, the left-handed circle propagated in transparent phosphor 56
The phase velocity of polarized light and right-circularly polarized light is modulated by magnetic field intensity in ring concentrator respectively, the left circularly polarized light after modulation
With the power current generation in the strength information that right-hand circular polarization light phase carries additional alternating magnetic field respectively, i.e. ring concentrator 6
The information of alternating magnetic field intensity.Therefore, by two-way light after transparent phosphor 56 with the power current size of power transmission line 7
Information.
The work process of above-mentioned magneto-opitcal current transducer is: the light of laser instrument 1 output enters through 2 × 2 bonders 10 and protects
Polarisation fibre 3, is divided into two-way light to input magneto-optic module 5, these two-way light amplitude size, polarization state etc. through one-to-two optical fiber splitter 4
Completely the same, i.e. the polarization direction of line polarized light of laser instrument 1 output, fast axle (or slow axis) direction of polarization maintaining optical fibre 11, polarization
Sheet 53 polarization direction is substantially parallel, and this two-way light is inclined respectively through becoming a left-handed circle in road after collimator, polaroid, λ/4 wave plate
Shake Guang He mono-road right-circularly polarized light, and this two-way light impinges perpendicularly in transparent phosphor 56 simultaneously, respectively through transparent phosphor
After completely reflecting mirror 57 reflection at 56 two ends, the direction of propagation of two-way light all changes 90 °, and along the long axis direction of transparent phosphor 56
Going in the same direction, the two-way light after the completely reflecting mirror 57 of transparent phosphor 56 other end reflects continues to return along the light path of the other side,
Exported to demodulation of frequency discriminator device 9 by 2 × 2 bonders 10.Owing to magnetic rotation effect is to left circularly polarized light and right-hand circular polarization
The not same-action of light, the signal envelope change frequency after the two-way interference of light contains linear with the size of current being detected power transmission line
The magnetic field intensity information of relation, detects relevant information by demodulation of frequency discriminator device 9 or spectrogrph.
The magneto-opitcal current transducer that the embodiment of the present invention provides, makes based on magnetic rotation effect, belongs to passive photoelectricity
, there is not high-voltage electromagnetic interference or the puzzlement of high-voltage breakdown, and avoid linear birefrigence to system accuracy in current transformer
Impact；Light path in transparent phosphor is parallel to the magnetic direction in ring concentrator, is conducive to strengthening magneto-optic effect, improves inspection
The sensitivity surveyed；Symmetry, closed loop double light path, single polarization maintaining optical fibre, sensing field is utilized to complete the detection mode interfered；Directly pass through
Spectrogrph demodulation or the mode of demodulation of frequency discriminator.Significantly improve LASER Light Source output instability, the change of ambient temperature, the external world
The impact on certainty of measurement such as vibrations, optics Parameters variation；Demodulated signal dynamic range is big, highly sensitive, simple in construction,
Be conducive to engineering application.
Transparent phosphor 56 selects the material with strong magneto-optic effect coefficient to make.
Completely reflecting mirror 57 can realize by plating the reflectance coating of high reflecting rate in transparent phosphor 56.
Ring concentrator 6 uses the magnetic material of nanometer high permeability to make, have that good magnetization is Linearity, approximate zero magnetic hysteresis,
Zero coercive rate.As in figure 2 it is shown, ring concentrator 6 is made up of full symmetric two collection magnetic semi-rings, this structure makes the ring concentrator 6 can
Directly power transmission line 7 is assembled or disassembles, it is not necessary to assemble ring concentrator 6 by dismounting power transmission line 7；Two collection magnetic semi-rings assemble
After, wherein a joint is docked completely, installs magneto-optic module 5 at an other play movement, and magnetic circuit is still in closed loop states；Collection magnetic
The trapezoidal shape in end that ring 6 is unsettled, this structure contribute to further by magnetic field concentration in transparent phosphor 56, advantageously reduce
Because other magneto-optic effect such as section Morton effect of pausing is on the impact of other optics in magneto-optic module 5, improves further and measure
Accuracy and sensitivity.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on
So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered
Row equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme, it all should be contained in the middle of the claim of the present invention and the scope of description.
Claims (10)
1. a magneto-opitcal current transducer, it is characterised in that including: laser instrument, 3 × 3 bonders, the first polarization maintaining optical fibre, second
Polarization maintaining optical fibre, magneto-optic module, ring concentrator, phase demodulator；
Described magneto-optic module includes first collimator, the second collimator, polaroid, λ/4 wave plate, the 2nd λ/4 wave plate, transparent
Phosphor；Described transparent phosphor is cuboid, and the two ends of the long axis direction of described transparent phosphor are completely reflecting mirror, described entirely
Reflecting mirror is 45 ° with the angle of the major axis of described transparent phosphor；In the major axis of described transparent phosphor and described ring concentrator
Magnetic direction is parallel；
Described laser instrument is connected with the first port of described 3 × 3 bonders；Second port of described 3 × 3 bonders, described
One polarization maintaining optical fibre, described first collimator, described polaroid, described λ/4 wave plate are sequentially connected with；Described 3 × 3 bonders
3rd port, described second polarization maintaining optical fibre, described second collimator, described polaroid, described 2nd λ/4 wave plate are sequentially connected with；
Described first polarization maintaining optical fibre soon axially or slow axis to, described second polarization maintaining optical fibre soon axially or slow axis is to, described polaroid polarization
Direction is consistent；Described λ/4 wave plate fast axially or slow axis to described 2nd λ/4 wave plate fast axially or slow axis is to mutually
Orthogonal, and polaroid polarization direction be positioned at the fast axle of described λ/4 wave plate or slow axis and described 2nd λ/4 wave plate fast axle or
The orthogonal angle bisector of slow axis；A described λ/4 wave plate output left circularly polarized light, described 2nd λ/4 wave plate output dextrorotation circle
Polarized light, the direction of rotation of described left circularly polarized light and described right-circularly polarized light is in opposite directions；Described left circularly polarized light and institute
State right-circularly polarized light and be respectively perpendicular to the major axis incidence of described transparent phosphor, through the total reflection at described transparent phosphor two ends
The light path of mirror reflection tailing edge the other side returns, and respectively enters the 4th port and fifth port of described 3 × 3 bonders, Differential Output
To described phase demodulator；
Described phase demodulator carries out opto-electronic conversion for the light exported described 4th port and described fifth port respectively,
To the corresponding first via signal of telecommunication and the second road signal of telecommunication；The described first via signal of telecommunication is added with the described second road signal of telecommunication
Method computing, subtraction, differentiate, the result of differentiating of differentiate result and the difference of sum is carried out multiplication cross, to two
Multiplication cross result and be integrated computing, finally give phase demodulating output result.
Magneto-opitcal current transducer the most according to claim 1, it is characterised in that described transparent phosphor has strong magneto-optic effect
Answer coefficient.
Magneto-opitcal current transducer the most according to claim 1, it is characterised in that the material of described ring concentrator is that nanometer height is led
The magnetic material of magnetic rate.
Magneto-opitcal current transducer the most according to claim 1, it is characterised in that described ring concentrator include two full symmetric
Collection magnetic semi-ring, the seamed docking in one end of two described collection magnetic semi-rings, between the other end termination gap install described magneto-optic module.
Magneto-opitcal current transducer the most according to claim 4, it is characterised in that one end end that described collection magnetic semi-ring does not docks
Head shape in gradient.
6. a magneto-opitcal current transducer, it is characterised in that including: laser instrument, 2 × 2 bonders, polarization maintaining optical fibre, one-to-two light
Fine shunt, magneto-optic module, ring concentrator, demodulation of frequency discriminator device；
Described magneto-optic module includes first collimator, the second collimator, polaroid, λ/4 wave plate, the 2nd λ/4 wave plate, transparent
Phosphor；Described transparent phosphor is cuboid, and the two ends of the long axis direction of described transparent phosphor are completely reflecting mirror, described entirely
Reflecting mirror is 45 ° with the angle of the major axis of described transparent phosphor；In the major axis of described transparent phosphor and described ring concentrator
Magnetic direction is parallel；
Described laser instrument is connected with the first port of described 2 × 2 bonders；Second port of described 2 × 2 bonders, described guarantor
Polarisation one-to-two fine, described optical fiber splitter first input port, described one-to-two optical fiber splitter the second input port, described
First collimator, described polaroid, described λ/4 wave plate are sequentially connected with；Described one-to-two optical fiber splitter the 3rd port, institute
State the second collimator, described polaroid, described 2nd λ/4 wave plate are sequentially connected with；The fast axle of described polarization maintaining optical fibre or slow axis are to, polarization
Sheet polarization direction is consistent；The fast axle of described λ/4 wave plate or slow axis to the fast axle or slow axis with described 2nd λ/4 wave plate to phase
The most orthogonal, and polaroid polarization direction is positioned at the fast axle of the fast axle of described λ/4 wave plate or slow axis and described 2nd λ/4 wave plate
Or the orthogonal angle bisector of slow axis；A described λ/4 wave plate output left circularly polarized light, described 2nd λ/4 wave plate output dextrorotation
The direction of rotation of circularly polarized light, described left circularly polarized light and described right-circularly polarized light is in opposite directions；Described left circularly polarized light and
The major axis that described right-circularly polarized light is respectively perpendicular to described transparent phosphor is incident, through being all-trans of described transparent phosphor two ends
The light path penetrating mirror reflection tailing edge the other side returns, and is closed to one-to-two optical fiber splitter, is formed after interfering through described polarization maintaining optical fibre, institute
The 3rd port stating 2 × 2 bonders exports to demodulation of frequency discriminator device；
Described demodulation of frequency discriminator device is for carrying out spectrogrph demodulation to the optical signal of described 2 × 2 bonder the 3rd port outputs or enter
The output of row opto-electronic conversion, demodulation of frequency discriminator, analog digital conversion, Digital Signal Processing, finally give demodulation output result.
Magneto-opitcal current transducer the most according to claim 6, it is characterised in that described transparent phosphor has strong magneto-optic effect
Answer coefficient.
Magneto-opitcal current transducer the most according to claim 6, it is characterised in that the material of described ring concentrator is that nanometer height is led
The magnetic material of magnetic rate.
Magneto-opitcal current transducer the most according to claim 6, it is characterised in that described ring concentrator include two full symmetric
Collection magnetic semi-ring, the seamed docking in one end of two described collection magnetic semi-rings, between the other end termination gap install described magneto-optic module.
Magneto-opitcal current transducer the most according to claim 9, it is characterised in that the termination that described collection magnetic semi-ring is unsettled
Shape in gradient.
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| CN201610594810.3A CN106291040B (en) | 2016-07-26 | 2016-07-26 | Magneto-opitcal current transducer |
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| CN107192869A (en) * | 2017-07-14 | 2017-09-22 | 国网辽宁省电力有限公司电力科学研究院 | A kind of method of optical current mutual inductor and the anti-vibration interference realized using the current transformer with antivibration function |
| CN110531133A (en) * | 2019-09-27 | 2019-12-03 | 北京世维通光智能科技有限公司 | A kind of fibre optic current sensor |
| CN115561503A (en) * | 2022-11-11 | 2023-01-03 | 北京世维通光智能科技有限公司 | Optical fiber current transformer |
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