CN102466558A - Magnetic optical isolator rotation angle measuring method and optical parameter measuring device - Google Patents
Magnetic optical isolator rotation angle measuring method and optical parameter measuring device Download PDFInfo
- Publication number
- CN102466558A CN102466558A CN2010105398093A CN201010539809A CN102466558A CN 102466558 A CN102466558 A CN 102466558A CN 2010105398093 A CN2010105398093 A CN 2010105398093A CN 201010539809 A CN201010539809 A CN 201010539809A CN 102466558 A CN102466558 A CN 102466558A
- Authority
- CN
- China
- Prior art keywords
- analyzer
- angle
- polarizer
- control signal
- magneto optic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a magnetic optical isolator rotation angle measuring method and an optical parameter measuring device. The magnetic optical isolator rotation angle measuring method comprises the steps of: a, providing a laser, a beam expanding mirror, a beam reducing mirror, a polarization analyzer, and a photoelectric sensing device which are arranged along a light path; b, rotating the polarization analyzer to a reference angle display value theta 1, at this time, defining the reading of the photoelectric sensing device as P1; c, placing a polarizer between the laser and the beam expanding mirror, and rotating the polarizer to enable the reading of the photoelectric sensor to be first minimum value P2; d, placing a magnetic optical isolator to be measured between the beam expanding mirror and the beam reducing mirror, adjusting the magnetic optical isolator to enable the reading of the photoelectric sensing device to be maximal, rotating the polarizer to enable the reading of the photoelectric sensing device to be second minimum value Pmin, at this time, defining the rotation angle of the polarizer as theta 2; and e, obtaining the rotation angle theta of the magnetic optical isolator, wherein the theta is the absolute value of the difference value between the theta 1 and the theta 2. The magnetic optical isolator rotation angle measuring method disclosed by the invention has higher measuring accuracy.
Description
Technical field
The present invention relates to a kind of measuring method and optical parameter measurement device of magneto optic isolator optically-active angle.
Background technology
Extinction ratio is to weigh the important parameter of optical element optical performance, has reflected the defective that its inside possibly exist, like internal stress, optical heterogeneity etc.Its extinction ratio is exactly to weigh an important parameter of optical heterogeneity.
Regulation adopts: Pmax is illustrated in the highest luminous power of ellipse Gaussian beam long axis direction in the plane of vertical optical axis, and Pmin is illustrated in the minimum luminous power of ellipse Gaussian beam long axis direction in the plane of vertical optical axis.Then extinction ratio is defined as:
EX＝10lg(Pmax/Pmin) (1)
The unit of extinction ratio is: dB.
The test of extinction ratio has very important practical value in practical application.The accuracy that crystal extinction ratio is measured directly influences development, production and the application of crystal.
The polarization of measuring element has the equipment of comparative maturity; As: the PAX5700 of Thorlabs company series fall-off meter, it utilizes Jones (Jones) and Miller (Mueller) matrix to measure, but we use its optically-active angle of measuring the heavy caliber magneto optic isolator and extinction ratio test and inconvenient; Reason is that beam size is immutable; Can not unifiedly test, and influenced by ambient lighting, make measuring accuracy low.
Summary of the invention
In order to solve the lower problem of optically-active angle precision of prior art device measuring magneto optic isolator, the present invention provides a kind of measuring method of the easy to operate and magneto optic isolator optically-active angle that efficient is higher.
The present invention also provides a kind of optical parameter measurement device that is used to implement above-mentioned measuring method.
Technical scheme of the present invention is:
A kind of measuring method of magneto optic isolator optically-active angle, this method comprise the following steps: that a. provides a laser instrument, a beam expanding lens, a beam-shrinked mirror, an analyzer and optoelectronic sensor that sets gradually along light path; B. rotate analyzer to an angle indicating value θ
1, this moment, said optoelectronic sensor reading was P
1C. between said laser instrument and said beam expanding lens, put into a polarizer, rotate the said polarizer, making said optoelectronic sensor reading is the first minimum value P2; D. between said beam expanding lens and said beam-shrinked mirror, put into magneto optic isolator to be measured, adjust said magneto optic isolator and make said optoelectronic sensor reading maximum, rotate said analyzer, making said optoelectronic sensor reading is the second minimum value P
Min, this moment, the anglec of rotation of analyzer was designated as θ
2E. the optically-active angle of said magneto optic isolator be θ=| θ
1-θ
2|.
In one embodiment, also comprising diaphragm at least one position between said magneto optic isolator and the said beam expanding lens and between the said beam expanding lens and the said polarizer.
In one embodiment, in said step c, P
1: P
2Greater than 10
5
In one embodiment, the laser diameter through said beam expanding lens reaches 90% of said magneto optic isolator clear aperture at least.
In one embodiment, said optoelectronic sensor outer setting has a cover that is used to block parasitic light.
Measuring method of the present invention makes beam size adjustable arbitrarily owing to increase variable beam expanding lens in the light path, therefore can unified measurement magneto optic isolator, and make measurement result comparatively accurate.
Further, the present invention gets into magneto optic isolator through the hot spot of specific size of diaphragm selected parts and shape, makes measurement result more accurate.
Further, the present invention makes parasitic light can not get into the probe of optoelectronic sensor through outside optoelectronic sensor, adding cover, removes bias light and disturbs, and has improved contrast, and then has further improved measuring accuracy.
A kind of optical parameter measurement device; It comprises a laser instrument setting gradually along light path, polarizer, beam expanding lens, one be used to install the frock of optical element to be measured, a beam-shrinked mirror, an analyzer, an optoelectronic sensor that is used for the output light intensity signal; Wherein, Said optical parameter measurement device also comprises: one first driving mechanism is used for controlling the said polarizer according to one first control signal and in perpendicular to the plane of light path, moves; One second driving mechanism is used for controlling said optical element to be measured according to one second control signal and in perpendicular to the plane of light path, moves; One first rotating mechanism is used for controlling the said polarizer according to one the 3rd control signal and rotates along its optical axis; One second rotating mechanism is used for controlling said optical element to be measured according to one the 4th control signal and rotates along its optical axis; One the 3rd rotating mechanism is used for controlling said analyzer according to one the 5th control signal and rotates along its optical axis; An angle sense mechanism is used for the rotational angle of the said analyzer of sensing along its optical axis, and exports one according to angle signal of this rotational angle generation; A control module; Be used for selectively exporting said first control signal, second control signal, the 3rd control signal, the 4th control signal, the 5th control signal; Also be used to receive said light intensity signal and said angle signal, and the pairing angle of said analyzer when drawing the light intensity minimum value according to said light intensity signal and said angle signal.
In one embodiment; In said first driving mechanism and said second driving mechanism each comprises guide rail, drive motor and position limiting structure perpendicular to optical axis direction; In said first rotating mechanism, second rotating mechanism, the 3rd rotating mechanism each comprises a stepper motor; Said angle sense mechanism comprises Hall element, and said control module comprises PC.
Measurement mechanism of the present invention can be accomplished measurement automatically according to program setting, makes that to measure automaticity high, and measuring speed is fast, reduce the possibility of manual operation mistake and the subjectivity of artificial reading, makes accuracy rate of measuring higher.
Description of drawings
Fig. 1 is the structural representation of the measurement mechanism that adopted of measuring method first embodiment of measuring method and the magneto optic isolator extinction ratio of magneto optic isolator optically-active angle of the present invention.
Fig. 2 is the flow chart of steps of a kind of preferred embodiments of measuring method of magneto optic isolator optically-active angle of the present invention.
Fig. 3 is the flow chart of steps of a kind of preferred embodiments of measuring method of magneto optic isolator extinction ratio of the present invention.
Fig. 4 is the structural representation of the measurement mechanism that adopted of measuring method second embodiment of measuring method and the magneto optic isolator extinction ratio of magneto optic isolator optically-active angle of the present invention.
Embodiment
Please with reference to Fig. 1, at first introduce the measurement mechanism 1 that measuring method first embodiment of measuring method and the magneto optic isolator extinction ratio of magneto optic isolator optically-active angle of the present invention is adopted.Measurement mechanism 1 comprises that the diaphragm 15, one of the diaphragm 13 of a laser instrument 11, polarizer 12, an adjustable bore, beam expanding lens 14, an adjustable bore are used to install the frock 16 of magneto optic isolator to be measured, beam-shrinked mirror 17, analyzer 18, an optoelectronic sensor 19 and a guide rail 10.Guide rail 10 comprises a plurality of sliding seats 101 that can slide along guide rail 10.Magneto optic isolator to be measured is installed on the frock 16.Laser instrument 11, the polarizer 12, diaphragm 13, beam expanding lens 14, diaphragm 15, frock 16, beam-shrinked mirror 17, analyzer 18 and optoelectronic sensor 19 are installed on the sliding seat 101 in regular turn, and make the maintenance that they are as well as possible and the right alignment of light path.
In this embodiment, preferred, optoelectronic sensor 19 is a Slim Si light power meter, and Slim Si light power meter probe response scope is superior to 60dB.The light power meter photoelectric probe can increase light shield in addition, diffuses to the interference of measurement result with elimination.
Preferably, the polarizer 12 is superior to 50dB with the extinction ratio of analyzer 18, and the polarizer 12 all adopts Rochon prism with analyzer 18 in this embodiment.
Preferably, analyzer 18 angle of pivoting can be read, and precision is not less than 0.1 °.
Preferably, laser instrument 11 degree of stability are superior to 5% (RMS value), and wavelengths centered is drifted about less than 4nm.
Preferably, the test request environment temperature must write down ambient temperature value 20 ℃ ± 1 ℃ scope during test.
In other embodiment, beam-shrinked mirror 17 can be a reverse beam expanding lens of placing.Optoelectronic sensor 19 can also be selected from photodiode, photomultiplier etc.
Introduce first embodiment of the measuring method that adopts this embodiment magneto optic isolator optically-active angle below.Please see figures.1.and.2 in the lump, Fig. 2 is the flow chart of steps of the measuring method of this embodiment magneto optic isolator optically-active angle.
Step S1, this measurement mechanism 1 is provided, but the polarizer 12 wouldn't be installed;
This measurement mechanism 1 is provided, and laser instrument 11 output beam diameters expand bundle by beam expanding lens 14 as far as possible, generally reach 90% of clear aperture.
Step S2,18 to angle indicating value θ of rotation analyzer
1, this moment, said optoelectronic sensor 19 readings were P
1
θ
1Can be arbitrary value, for convenient, near general fetch water flat or the plumbness, so that reading gets final product.Recording optical power meter reading value P
1To add light shield to the light power meter probe during survey measurements, block parasitic light.
Step S3, between said laser instrument 11 and said beam expanding lens 14, put into the polarizer 12, rotate the said polarizer 12, making said optoelectronic sensor 19 readings is minimum value P
2
Step S4, between said beam expanding lens 14 and said beam-shrinked mirror 17, put into magneto optic isolator to be measured, adjust said magneto optic isolator and make said optoelectronic sensor 19 readings maximum, this moment, the crystal normal was substantially parallel with light; Rotate said analyzer 18, make said optoelectronic sensor 19 readings be minimum value P once more
Min, this moment, the anglec of rotation of analyzer was designated as θ
2
The optically-active angle of step S5, said magneto optic isolator be θ=| θ
1-θ
2|.
In addition, can also handle as follows measurement result:
Require to meet light and see, should be clockwise optically-active by the actual index path of test, otherwise defective;
Note simultaneously deviation delta θ with respect to 45 °=| θ-45 ° | maximal value as the optically-active angular error, should be less than 1 °.
Introduce the instance of magneto optic isolator of a ф 40mm of the measuring method utilize the first embodiment magneto optic isolator optically-active angle below.
Test condition: environment temperature is measured in 1000 grades of toilets at 20 ℃, and laser instrument 11 degree of stability are superior to 5%, and light power meter 19 is qualified in the measurement verification calibration term of validity.
1) ф 37mm is restrainted in the expansion of laser instrument 11 output beam diameters, does not put into the magneto optic isolator and the polarizer 12,18 to angle indicating value θ of rotation analyzer
1=20 °, recording optical power meter 19 reading value P
1=300 milliwatts (will add cover to the power meter probe during survey measurements, block parasitic light);
2) put into the polarizer 12, the rotation polarizer 12, making light power meter 19 readings is minimum value P
2=2 microwatts, and P
1: P
2Greater than 10
5, can carry out follow-up test;
3) put into magneto optic isolator, make and rotate analyzer 18 then by light power meter 19 readings maximum (this moment, the crystal normal was substantially parallel with light), make light power meter 19 readings be minimum value P once more
Min=30 microwatts, this moment, the anglec of rotation of analyzer 18 was designated as θ
2=64.7 °;
4) the optically-active angle of magneto optic isolator be θ=| θ 1-θ 2|, meet light and see, be the photosynthetic lattice of dextrorotation;
5) note simultaneously deviation delta θ with respect to 45 °=| θ-45 ° | maximal value be 0.3 ° as the optically-active angular error, 0.3 ° less than 1 °, is qualified therefore.
Introduce first embodiment of the measuring method of magneto optic isolator extinction ratio of the present invention below.Please in the lump with reference to Fig. 1 and Fig. 3, Fig. 3 is the flow chart of steps of the measuring method of this embodiment magneto optic isolator extinction ratio.
Step S11, this measurement mechanism 1 is provided, but the polarizer 12 wouldn't be installed;
This measurement mechanism 1 is provided, and laser instrument 11 output beam diameters expand bundle by beam expanding lens 14 as far as possible, generally reach 90% of clear aperture.
Step S12,18 to angle indicating value θ of rotation analyzer
1, this moment, said optoelectronic sensor 19 readings were P
1
θ
1Can be arbitrary value, near the flat or plumbness of general water intaking, and be convenient to reading and get final product.Recording optical power meter reading value P
1To add light shield to the light power meter probe during survey measurements, block parasitic light.
Step S13, between said laser instrument 11 and said beam expanding lens 14, put into the polarizer 12, rotate the said polarizer 12, making said optoelectronic sensor 19 readings is minimum value P2;
Step S14, between said beam expanding lens 14 and said beam-shrinked mirror 17, put into magneto optic isolator to be measured, adjust said magneto optic isolator and make said optoelectronic sensor 19 readings maximum, this moment, the crystal normal was substantially parallel with light; Rotate said analyzer 18, make said optoelectronic sensor 19 readings be minimum value P once more
Min
Step S15, the said analyzer 18 of rotation make that said optoelectronic sensor 19 readings are maximal value P
Max
Step S16, with P
MaxAnd P
MinFor people's formula E
x=P
Max/ P
Min, calculate the extinction ratio E of measured device
x
Introduce the instance of magneto optic isolator of a ф 40mm of the measuring method utilize the first embodiment magneto optic isolator extinction ratio below.
Test condition: environment temperature is measured in 1000 grades of toilets at 20 ℃, and laser instrument 11 degree of stability are superior to 5%, and light power meter 19 is qualified in the measurement verification calibration term of validity.
1) ф 37mm is restrainted in the expansion of laser instrument 11 output beam diameters, does not put into the magneto optic isolator and the polarizer 12,18 to angle indicating value θ of rotation analyzer
1=20 °, recording optical power meter 19 reading value P
1=300 milliwatts (will add cover to the power meter probe during survey measurements, block parasitic light);
2) put into the polarizer 12, the rotation polarizer 12, making light power meter 19 readings is minimum value P
2=2 microwatts, and P
1: P
2Greater than 10
5, can carry out follow-up test;
3) put into magneto optic isolator, make and rotate analyzer 18 then by light power meter 19 readings maximum (this moment, the crystal normal was substantially parallel with light), make light power meter 19 readings be minimum value P once more
Min=30 microwatts.
4) rotate analyzer once more, make that the light power meter reading is maximal value P
Max=294 milliwatts;
5) with P
MaxAnd P
MinFor people's formula Ex=P
Max/ P
Min=294000/30=9800 calculates the extinction ratio Ex of measured device.Ex is greater than 1000, and is qualified.
Please with reference to Fig. 4, introduce the measurement mechanism 2 that measuring method second embodiment of measuring method and the magneto optic isolator extinction ratio of magneto optic isolator optically-active angle of the present invention is adopted below.Measurement mechanism 2 comprises a laser instrument 21; A polarizer 22; The diaphragm 23 of an adjustable bore; A beam expanding lens 24; The diaphragm 25 of an adjustable bore; A frock 26 that is used to install magneto optic isolator to be measured; A beam-shrinked mirror 27; An analyzer 28; An optoelectronic sensor 29; Guide rail 20 with a plurality of sliding seats 201; One first driving mechanism 203; One second driving mechanism 204; One first rotating mechanism 205; One second rotating mechanism 206; One the 3rd rotating mechanism 207; An angle sense mechanism 208 and a control module (figure does not show).
Magneto optic isolator to be measured is installed on the frock 26, and laser instrument 21, diaphragm 23, beam expanding lens 24, diaphragm 25, frock 26, beam-shrinked mirror 27 and optoelectronic sensor 29 are installed on the sliding seat 201 in regular turn, and makes the maintenance that they are as well as possible and the right alignment of light path.The polarizer 22 is installed on first rotating mechanism 205, and first rotating mechanism 205 is installed on first driving mechanism 203.Frock 26 is installed on second rotating mechanism 204, and second rotating mechanism 204 is installed on second driving mechanism 206.Analyzer 28 is installed on the 3rd rotating mechanism 207.Said first driving mechanism 203, second driving mechanism 204, first rotating mechanism 205, second rotating mechanism 206, the 3rd rotating mechanism 207, angle sense mechanism 208 and optoelectronic sensor 29 are electrically connected with control module through lead respectively.
In this embodiment; First rotating mechanism 205, second rotating mechanism 206, the 3rd rotating mechanism 207 are stepper motors, and first driving mechanism 203 and second driving mechanism 204 comprise the secondary guide rail that extends perpendicular to guide rail 20 directions respectively, carry the drive motor that first rotating mechanism 205 and the 3rd rotating mechanism 207 move along this pair guide rail and be used to limit the shift position position limiting structure.First driving mechanism 20 is used for controlling the said polarizer 22 according to one first control signal of being sent by control module and moves along the secondary guide rail perpendicular to light path, makes this polarizer 22 can get into or shift out light path; Second driving mechanism 204 is used for controlling said optical element to be measured according to one second control signal of being sent by control module and moves along the secondary guide rail perpendicular to light path, makes this analyzer 28 can get into or shift out light path; First rotating mechanism 205 is used for controlling the said polarizer 22 according to one the 3rd control signal of being sent by control module and rotates along its optical axis; Second rotating mechanism 206 is used for controlling said optical element to be measured according to one the 4th control signal of being sent by control module and rotates along its optical axis; The 3rd rotating mechanism 207 is used for controlling said analyzer according to one the 5th control signal of being sent by control module and rotates along its optical axis.Angle sense mechanism 208 comprises a plurality of Hall elements that are centered around analyzer 28 peripheries and a magnetic dot that is installed in the edge of analyzer 28; Be used for the rotational angle of the said analyzer 28 of sensing, and export one according to angle signal of this rotational angle generation along its optical axis.In other embodiment, angle sense mechanism 208 can also be a plurality of photodiodes or a CCD and a LED who is installed in the edge of analyzer 28 who is centered around analyzer 28 peripheries.
Control module is under the control of application program; Step according to the inventive method is subscribed is exported said first control signal, second control signal, the 3rd control signal, the 4th control signal, the 5th control signal selectively; And receive said light intensity signal and said angle signal; And draw the angle value of light intensity value and analyzer 28 according to said light intensity signal and said angle signal; Especially analyzer 28 pairing angles when light intensity minimum value and maximal value and minimum value and maximal value are calculated optically-active angle and extinction ratio, realize automatic measurement.In this embodiment, control module is to have display interface and input-output device PC, and in other embodiments, control module can also be single-chip microcomputer, ARM, DSP etc.
Introduce second embodiment of the measuring method that adopts this embodiment magneto optic isolator optically-active angle below.Please in the lump with reference to Fig. 4 and Fig. 2, Fig. 2 is the flow chart of steps of the measuring method of this embodiment magneto optic isolator optically-active angle.
Step S1, this measurement mechanism 1 is provided, but the polarizer 12 wouldn't be installed;
This measurement mechanism 1 is provided, and control module controls first driving mechanism 203 and second driving mechanism 204 shifts out light path with the polarizer 22 and optical element to be measured.This moment, laser instrument 11 output beam diameters expanded bundle by beam expanding lens 14 as far as possible, generally reached 90% of clear aperture.
Step S2,18 to angle indicating value θ of rotation analyzer
1, this moment, said optoelectronic sensor 19 readings were P
1
Control module is controlled the 3rd rotating mechanism 207 analyzer 28 is turned to an angle θ
1, read this angle θ through angle sense mechanism 208
1θ
1Can be arbitrary value, at this moment angle θ
1With light power meter reading value P
1All the Be Controlled unit reads and preserves.
Step S3, between said laser instrument 11 and said beam expanding lens 14, put into the polarizer 12, rotate the said polarizer 12, making said optoelectronic sensor 19 readings is minimum value P
2
Control module is controlled first driving mechanism 203 polarizer 22 is moved into light path, and control module is controlled first rotating mechanism 205 and made the polarizer 22 rotations, is minimum value P until optoelectronic sensor 19 readings
2In time, stop.
Step S4, between said beam expanding lens 14 and said beam-shrinked mirror 17, put into magneto optic isolator to be measured, adjust said magneto optic isolator and make said optoelectronic sensor 19 readings maximum, this moment, the crystal normal was substantially parallel with light; Rotate said analyzer 18, make said optoelectronic sensor 19 readings be minimum value P once more
Min, this moment, the anglec of rotation of analyzer was designated as θ
2
Control module is controlled second driving mechanism 204 magneto optic isolator to be measured is moved into light path, and controls second rotating mechanism 206 magneto optic isolator to be measured is rotated, and is minimum value P until optoelectronic sensor 19 readings
2In time, stop.Control module is controlled the 3rd rotating mechanism 207 rotates analyzer 28, is minimum value P once more until optoelectronic sensor 19 readings
MinIn time, stop.This moment, the anglec of rotation of analyzer 28 was designated as θ
2, read this angle θ through angle sense mechanism 208
2
The optically-active angle of step S5, said magneto optic isolator be θ=| θ
1-θ
2|.
Control module is according to θ
1And θ
2Calculated theta, and show.
Introduce second embodiment of the measuring method of magneto optic isolator extinction ratio of the present invention below.Please in the lump with reference to Fig. 4 and Fig. 3, Fig. 3 is the flow chart of steps of the measuring method of this embodiment magneto optic isolator extinction ratio.
Step S1, this measurement mechanism 1 is provided, but the polarizer 12 wouldn't be installed;
This measurement mechanism 1 is provided, and control module controls first driving mechanism 203 and second driving mechanism 204 shifts out light path with the polarizer 22 and optical element to be measured.This moment, laser instrument 11 output beam diameters expanded bundle by beam expanding lens 14 as far as possible, generally reached 90% of clear aperture.
Step S2,18 to angle indicating value θ of rotation analyzer
1, this moment, said optoelectronic sensor 19 readings were P
1
Control module is controlled the 3rd rotating mechanism 207 analyzer 28 is turned to an angle θ
1, read this angle θ through angle sense mechanism 208
1θ
1Can be arbitrary value, at this moment angle θ
1With light power meter reading value P
1All the Be Controlled unit reads and preserves.
Step S3, between said laser instrument 11 and said beam expanding lens 14, put into the polarizer 12, rotate the said polarizer 12, making said optoelectronic sensor 19 readings is minimum value P
2
Control module is controlled first driving mechanism 203 polarizer 22 is moved into light path, and control module is controlled first rotating mechanism 205 and made the polarizer 22 rotations, is minimum value P until optoelectronic sensor 19 readings
2In time, stop.
Step S14, between said beam expanding lens 14 and said beam-shrinked mirror 17, put into magneto optic isolator to be measured, adjust said magneto optic isolator and make said optoelectronic sensor 19 readings maximum, this moment, the crystal normal was substantially parallel with light; Rotate said analyzer 18, make said optoelectronic sensor 19 readings be minimum value P once more
Min
Step S15, the said analyzer 18 of rotation make that said optoelectronic sensor 19 readings are maximal value P
Max
Control module is controlled second driving mechanism 204 magneto optic isolator to be measured is moved into light path, and controls second rotating mechanism 206 magneto optic isolator to be measured is rotated, and is minimum value P until optoelectronic sensor 19 readings
2In time, stop.Control module is controlled the 3rd rotating mechanism 207 makes analyzer 28 rotate the minimum value P of control module recording light electric sensor 19 readings
MinWith maximal value P
Max
Step S16, with P
MaxAnd P
MinFor people's formula E
x=P
Max/ P
Min, calculate the extinction ratio E of measured device
x
Control module is according to the minimum value P of this record
MinWith maximal value P
MaxCalculate the extinction ratio E of measured device
x, and show.
The measuring method of magneto optic isolator optically-active angle of the present invention and the measuring method of magneto optic isolator extinction ratio have following beneficial effect:
1. utilize measurement mechanism 1 shown in Figure 1; The adjustment of height of center need not be moved light path, but high through the cushion block dead center, and our kind of test is limited; What take is that the mode of fixedly pad thickness changes height of center fast; Also can save the adjustment time, make measurement faster through one dimension lifting table change height of center.
2. increase variable beam expanding lens in the light path, make beam size adjustable arbitrarily, and can get into magneto optic isolator through the hot spot of specific size of diaphragm selected parts and shape.Therefore can unified (ф 6～ф 40 is adjustable, and can obtain more precisely bore shape and size through diaphragm) measure magneto optic isolator, this is that the general test instrument does not possess, and can test fast in case bore is reserved also.
3. adopt the very high Slim Si of sensitivity power meter probe, add, make parasitic light can not get into probe, remove bias light and disturb, improved contrast, and then improved the extinction ratio measuring accuracy cover visible and near-infrared reflection.
In addition, the measuring method of magneto optic isolator optically-active angle of the present invention and the measuring method of magneto optic isolator extinction ratio be owing to adopted above-mentioned guide rail, frock and sliding seat structure, make its simple in structure, easy to operate, cost is lower.
Above-mentioned embodiment has been described in realization in order to demonstrate the invention.But other variations of the present invention and modification are conspicuous to those skilled in the art, and any modification/variation in disclosed essence of the present invention and cardinal rule scope perhaps imitates conversion all to belong to claim protection domain of the present invention.
Claims (7)
1. the measuring method of a magneto optic isolator optically-active angle is characterized in that, this method comprises the following steps:
A., a laser instrument, a beam expanding lens, a beam-shrinked mirror, an analyzer and an optoelectronic sensor of setting gradually along light path are provided;
B. rotate analyzer to an angle indicating value θ
1, this moment, said optoelectronic sensor reading was P
1
C. between said laser instrument and said beam expanding lens, put into a polarizer, rotate the said polarizer, making said optoelectronic sensor reading is the first minimum value P2;
D. between said beam expanding lens and said beam-shrinked mirror, put into magneto optic isolator to be measured, adjust said magneto optic isolator and make said optoelectronic sensor reading maximum, rotate said analyzer, making said optoelectronic sensor reading is the second minimum value P
Min, this moment, the anglec of rotation of analyzer was designated as θ
2
E. the optically-active angle of said magneto optic isolator be θ=| θ
1-θ
2|.
2. method according to claim 1 is characterized in that: also comprising diaphragm at least one position between said magneto optic isolator and the said beam expanding lens and between the said beam expanding lens and the said polarizer.
3. method according to claim 1 is characterized in that: in said step c, and P
1: P
2Greater than 10
5
4. method according to claim 1 is characterized in that: the laser diameter through said beam expanding lens reaches 90% of said magneto optic isolator clear aperture at least.
5. method according to claim 1 is characterized in that: said optoelectronic sensor outer setting has a cover that is used to block parasitic light.
6. optical parameter measurement device; It comprises a laser instrument setting gradually along light path, polarizer, beam expanding lens, one be used to install the frock of optical element to be measured, a beam-shrinked mirror, an analyzer, an optoelectronic sensor that is used for the output light intensity signal; It is characterized in that said optical parameter measurement device also comprises:
One first driving mechanism is used for controlling the said polarizer according to one first control signal and in perpendicular to the plane of light path, moves;
One second driving mechanism is used for controlling said optical element to be measured according to one second control signal and in perpendicular to the plane of light path, moves;
One first rotating mechanism is used for controlling the said polarizer according to one the 3rd control signal and rotates along its optical axis;
One second rotating mechanism is used for controlling said optical element to be measured according to one the 4th control signal and rotates along its optical axis;
One the 3rd rotating mechanism is used for controlling said analyzer according to one the 5th control signal and rotates along its optical axis;
An angle sense mechanism is used for the rotational angle of the said analyzer of sensing along its optical axis, and exports one according to angle signal of this rotational angle generation;
A control module; Be used for selectively exporting said first control signal, second control signal, the 3rd control signal, the 4th control signal, the 5th control signal; Also be used to receive said light intensity signal and said angle signal, and the pairing angle of said analyzer when drawing the light intensity minimum value according to said light intensity signal and said angle signal.
7. optical parameter measurement device according to claim 6; It is characterized in that; In said first driving mechanism and said second driving mechanism each comprises guide rail, drive motor and position limiting structure perpendicular to optical axis direction; In said first rotating mechanism, second rotating mechanism, the 3rd rotating mechanism each comprises a stepper motor, and said angle sense mechanism comprises Hall element, and said control module comprises PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105398093A CN102466558A (en) | 2010-11-11 | 2010-11-11 | Magnetic optical isolator rotation angle measuring method and optical parameter measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105398093A CN102466558A (en) | 2010-11-11 | 2010-11-11 | Magnetic optical isolator rotation angle measuring method and optical parameter measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102466558A true CN102466558A (en) | 2012-05-23 |
Family
ID=46070463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105398093A Pending CN102466558A (en) | 2010-11-11 | 2010-11-11 | Magnetic optical isolator rotation angle measuring method and optical parameter measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102466558A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884489A (en) * | 2014-03-07 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Optical element measuring device and method |
| CN106052594A (en) * | 2016-05-10 | 2016-10-26 | 河南师范大学 | Method of measuring magneto optic fiber rotation angle by utilizing fiber grating laser optical beat frequency |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000131193A (en) * | 1998-10-23 | 2000-05-12 | Nec Corp | Device for measuring extinction ratio of light module |
| CN1645083A (en) * | 2004-12-28 | 2005-07-27 | 中国科学院上海光学精密机械研究所 | Intelligent comprehensive measuring instrument for half-wave voltage and wave plate phase delay of extinction ratio of crystal |
| CN1696632A (en) * | 2004-12-28 | 2005-11-16 | 中国科学院上海光学精密机械研究所 | Intelligent comprehensive measuring instrument for half-wave voltage and wave plate phase delay of extinction ratio of crystal |
| CN101290264A (en) * | 2008-04-25 | 2008-10-22 | 北京星光影视设备科技股份有限公司 | Lens laser focus-measuring device |
| CN201149528Y (en) * | 2007-11-21 | 2008-11-12 | 北京光电技术研究所 | Apparatus for measuring optically-active angle of activizer |
| CN201569558U (en) * | 2009-09-08 | 2010-09-01 | 湖北华中光电科技有限公司 | Automated focal length detector |
-
2010
- 2010-11-11 CN CN2010105398093A patent/CN102466558A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000131193A (en) * | 1998-10-23 | 2000-05-12 | Nec Corp | Device for measuring extinction ratio of light module |
| CN1645083A (en) * | 2004-12-28 | 2005-07-27 | 中国科学院上海光学精密机械研究所 | Intelligent comprehensive measuring instrument for half-wave voltage and wave plate phase delay of extinction ratio of crystal |
| CN1696632A (en) * | 2004-12-28 | 2005-11-16 | 中国科学院上海光学精密机械研究所 | Intelligent comprehensive measuring instrument for half-wave voltage and wave plate phase delay of extinction ratio of crystal |
| CN201149528Y (en) * | 2007-11-21 | 2008-11-12 | 北京光电技术研究所 | Apparatus for measuring optically-active angle of activizer |
| CN101290264A (en) * | 2008-04-25 | 2008-10-22 | 北京星光影视设备科技股份有限公司 | Lens laser focus-measuring device |
| CN201569558U (en) * | 2009-09-08 | 2010-09-01 | 湖北华中光电科技有限公司 | Automated focal length detector |
Non-Patent Citations (1)
| Title |
|---|
| 刘宝元等: "《基于LabVIEW的激光晶体消光比测试***设计》", 《研究与开发》, vol. 29, no. 6, 30 June 2010 (2010-06-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884489A (en) * | 2014-03-07 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Optical element measuring device and method |
| CN106052594A (en) * | 2016-05-10 | 2016-10-26 | 河南师范大学 | Method of measuring magneto optic fiber rotation angle by utilizing fiber grating laser optical beat frequency |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102183360B (en) | The detection method of polarization extinction ratio of optical polarizer and pick-up unit | |
| CN103486998B (en) | Autocollimation indication error calibration method | |
| CN102590150A (en) | Indoor hyperspectral bidirectional reflectance distribution function (BRDF) determining system | |
| CN100395542C (en) | Image testing method for chemical fibre thermal contraction rate and testing apparatus thereof | |
| CN102466560A (en) | Device for measuring optical parameters | |
| CN102564741B (en) | Method and system for measuring grating diffraction efficiency by using ellipsoidal reflecting mirror | |
| CN102338692A (en) | Device and method for measuring static extinction ratio | |
| CN105241640A (en) | Device for measuring blue light weighted radiation intensity and method thereof | |
| CN102466558A (en) | Magnetic optical isolator rotation angle measuring method and optical parameter measuring device | |
| CN103604751B (en) | The device of property measuring period chiral structure transparent membrane optical activity and corresponding method | |
| CN205404404U (en) | Novel refractometry demonstrates appearance | |
| CN201780263U (en) | Stress measurement device of optical material by laser feedback method | |
| CN103076305B (en) | Device for measuring surface diffuse reflectivity of material | |
| CN103398984B (en) | The outfield measuring method of photo-electric telescope transmissivity of optical system | |
| CN102466559A (en) | Method for measuring extinction ratio of magneto-optical isolator, and device for measuring optical parameter | |
| CN103196834B (en) | With the interference of light gas detecting system of air-pressure balancing device | |
| CN108180839A (en) | A kind of displacement sensor and detection device for small space detection | |
| CN109342317A (en) | A kind of optical parameter test device and method for plane black-materials | |
| CN212844019U (en) | Light beam quality measurement and analysis system of small light spot | |
| CN109060720A (en) | The quick, intelligent measuring device of liquid water-reducing agent solid content and method | |
| CN201434836Y (en) | Optical and digital integrated dual-mode intelligent methane detector | |
| CN214066916U (en) | Multi-axis differential absorption spectrometer measuring device | |
| CN205374006U (en) | Dura mater overlays prism lens prism degree detecting system | |
| CN103697920A (en) | Optical fiber sensing head and optical fiber sensing system and method for measuring liquid refractivity based on sensing head | |
| CN102620760A (en) | Optical fiber probe and composite type liquid optical fiber concentration meter employing optical fiber probe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120523 |