CN108709860A - A kind of polarimeter and measurement method based on differential zero passage detection - Google Patents
A kind of polarimeter and measurement method based on differential zero passage detection Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
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- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims description 34
- 239000000126 substance Substances 0.000 claims description 18
- 210000004027 cell Anatomy 0.000 claims description 12
- 238000013500 data storage Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 210000000352 storage cell Anatomy 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000711 polarimetry Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 240000008067 Cucumis sativus Species 0.000 description 1
- 235000010799 Cucumis sativus var sativus Nutrition 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
A kind of polarimeter and measurement method based on differential zero passage detection, it includes the light source set gradually from side to the other side, the polarizer, sample cell, prism, photoelectric converter, wherein photoelectric converter includes the first photoelectric converter, the second photoelectric converter；First photoelectric converter, the second photoelectric converter output end connect with the input terminal of the differential amplifier circuit in processing of circuit unit；Processing of circuit unit includes differential amplifier circuit, the frequency selection circuit being connect with differential amplifier circuit output end, the envelope detection circuit being connect with frequency selection circuit output end, the A/D conversion circuits being connect with envelope detection circuit output end, and the output end of processing of circuit unit and the input terminal of processor unit connect；Including signal generating circuit, the signal output end of signal generating circuit is connect with the controlled end of light source, motor respectively, and the armature spindle of motor is connect with the polarizer.The present invention is directed to the problem of traditional polarimeter power consumption is big, measurement accuracy is vulnerable to interference, it is proposed that a kind of polarimeter and measurement method based on differential zero passage detection.
Description
Technical field
The present invention relates to a kind of detection polarimeter, more particularly to a kind of polarimeter and measurement side based on differential zero passage detection
Method.
Background technology
By can occur optical rotation phenomenon when certain optically active compounds or its solution, i.e. linearly polarized light shakes linearly polarized light
Dynamic face can deflect around optical axis, and the angle of deflection is known as optical activity.Polarimetry analysis (abbreviation polarimetry) is inclined using line
Shake light, by causing optical rotation phenomenon when solution or liquid containing chemically reactive substance, make by polarised light the plane of oscillation
Rotation to the left or to the right.Therefore, under certain condition, the side rotated by vibration plane after Cucumber using detection linearly polarized light
To analyzing the optical activity of the certain compounds or impurity of detection compound, purity and content with the number of degrees.For measuring optical activity
Instrument, be referred to as polarimeter.Polarimetry is chiefly used in measuring sugared concentration, and in recent years, polarimetry also gradually applies to pharmacy, food
The fields such as processing, chemical industry and biochemical analysis.
According to Biot laws, the size of substance optical activity is related with the wavelength of the temperature of substance and linearly polarized light.Some objects
The optical activity of matter increases with the raising of temperature, such as quartz.And the optical activity of some substances reduces with the raising of temperature, such as
Sucrose etc..In addition, the wavelength of linearly polarized light is different, corresponding optical activity is also different.
The optical activity α (the linearly polarized light angle that vibration plane is turned over along the direction of propagation after substance) and optical rotatory substance of optically-active matter
Liquor capacity percent concentration C and polarised light by solution length L it is directly proportional, α=kCL, wherein C are g/100ml, and L is
mm。
The principle schematic diagram of traditional polarimeter is as shown in Figure 1, light source 1 uses sodium lamp, through aperture 2, object
A branch of relatively simple directional light can be obtained after mirror 3, directional light becomes linearly polarized light after the polarizer 4, and the plane of oscillation is
OO such as Fig. 2 (a), due to magnetic rotation, makes the plane of oscillation of linearly polarized light generate 50Hz when polarised light is through faraday's coil 5
The angles β such as Fig. 2 (b) of reciprocally swinging, light project after color filter 7, analyzer 8 on photomultiplier 9, generate alternation
Electric signal, polarised light vibration plane swing such as Fig. 2 (c) after by sample cell 6 equipped with sample rise after instrument registration balance
Inclined device 4 reversely turns over α1Degree compensates for the optical activity of sample, and such as Fig. 2 (d), 9 received signal of photomultiplier passes through preceding storing
It is exported again by frequency-selective amplifier 12, power amplifier 13 after big device 10, automatic high pressure circuit 11, drives servo motor 14.
Fig. 3 is the curve synoptic diagram of faraday's coil working principle in the prior art, as shown in figure 3, instrument is with the polarizer
4, (OO Shang PP) is used as optics zero when 8 optical axis of analyzer is orthogonal, is not put into optical rotatory substance in sample cell, at this time α=0 °.Method
It draws coil 5 to generate the β angular oscillatory motions (Fig. 3 (a)) with frequency for 50Hz, electric signal (Fig. 3 of 100Hz is obtained in photoelectric converter
(d)), when being put into α in sample cell1Degree or α2Photoelectric converter obtains the electric signal (Fig. 3 (b), (c)) of 50Hz when the sample of degree,
But their phase is exactly the opposite (Fig. 3 (e), Fig. 3 (f)).Therefore, the servo motor that working frequency is 50Hz can be made to rotate.It watches
It takes motor 14 and polariscope 4 is turned over by α (α=α by worm and gear 151Or α=α2), instrument returns to optics zero, servo motor 14
Under the control of 100Hz signals, balance instruction is reappeared.
In conclusion this method for surveying optical activity is to use faraday's coil modulated optical signal, but faraday's coil
Operating voltage is high, and power consumption is big, and volume is big, and modulating frequency is 50Hz, and frequency is low, easily by Hz noise, seriously affects measurement essence
Degree.In addition for the light source used in this method for sodium lamp, power consumption is larger, easy to aging.
Invention content
The present invention is directed to the problem of traditional polarimeter power consumption is big, measurement accuracy is vulnerable to interference, it is proposed that one kind is based on
The polarimeter and measurement method of differential zero passage detection.
In order to achieve the above objectives, design scheme of the invention is：
A kind of polarimeter based on differential zero passage detection, it includes the light source set gradually from side to the other side, is polarized
Device, sample cell, prism, photoelectric converter, wherein photoelectric converter includes the first photoelectric converter, the second photoelectric converter；The
One photoelectric converter, the second photoelectric converter output end with the input terminal of the differential amplifier circuit in processing of circuit unit connect
It connects；Processing of circuit unit includes differential amplifier circuit, the frequency selection circuit and frequency selection circuit that are connect with differential amplifier circuit output end
The envelope detection circuit of output end connection, the A/D conversion circuits being connect with envelope detection circuit output end, processing of circuit unit
The input terminal of output end and processor unit connects；Including signal generating circuit, the signal output end of signal generating circuit is distinguished
It is connect with the controlled end of light source, motor, the armature spindle of motor is connect with the polarizer.
Above-mentioned processor unit includes data storage cell, the data processing list being connect with data storage cell output end
Member and the display unit being connect with data processing unit output end.
When measuring, using following steps：
1) light path is adjusted, and adjusts the polarizer and prism, the polarizer and prism is made to be in quadrature position and fixation；
2) after optical rotatory substance being added in sample cell, frequency is generated by signal generating circuit and is the square-wave signal of f, and is loaded
Onto Frequency Adjustable semiconductor laser, the light that frequency is f becomes linearly polarized light after the polarizer, and linearly polarized light passes through sample cell
In optical rotatory substance retrodeviate polarization state and rotate, using being broken down into two-beam signal after prism, two-beam signal respectively by
First photoelectric converter, the second photoelectric converter receive, and the optical signal that two frequencies are f is changed into frequency and is by photoelectric converter
The AC signal of f；
3) photoelectric converter output frequency is that two AC signals of f calculate two in circuit part through differential amplifier circuit
The difference of signal, then through frequency selection circuit, envelope detection circuit, with digital signal form after amplitude limit clamp circuit, A/D conversion circuits
Input be stored in the data storage cell in microprocessor unit；
4) signal generating circuit sends out signal Driving Stepping Motor and drives polarizer rotation, the AC signal of photoelectric converter
Intensity changes, and repeats step 3), and microprocessor data unit records store each signal；
5) microprocessor handles the digital signal of storage, and solution concentration is learnt by calculating angle of rotation.
Above-mentioned prism is wollaston prism.Above-mentioned motor is stepper motor.
It is decomposed by fast Fourier in step 5), then digital filtering again, is obtained finally by the method for envelope detection
To the curve of the amplitude and stepper motor rotational angle of differential wave, curve zero-crossing values and zero passage side are calculated by curve matching
To calculating angle of rotation learns solution concentration in turn.
The optical direction of sample is obtained according to zero direction excessively in step 5).
The method have the advantages that：
The beneficial effects of the present invention are：The polarimeter and measurement method based on differential zero passage detection of the present invention, application
Wollaston prism constitutes differential zero passage detection pattern as analyzer, can eliminate the fixed influence of flashing, completes angle of rotation
Degree and direction of rotation measurement, have it is small, it is at low cost, it is low in energy consumption the features such as；Using microprocessor processes data, realize complete
Automatic digital greatly improves measurement accuracy and efficiency.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the principle schematic diagram of prior art polarimeter；
Fig. 2 is the Vibration Condition of prior art polarised light；
Fig. 3 is the curve synoptic diagram of prior art faraday's coil working principle；
Fig. 4 is the functional block diagram based on differential zero passage detection polarimeter of the present invention；
Fig. 5 is the detection curve figure based on differential zero passage detection polarimeter of the present invention；
Fig. 6 is the circuit diagram of the embodiment of the present invention.
Specific implementation mode
As shown in figure 4, a kind of polarimeter based on differential zero passage detection, including light path part and circuit part, light path portion
Divide includes Frequency Adjustable semiconductor laser light resource 16, the polarizer 17, sample cell 18 and wollaston prism 19 successively；Frequency Adjustable is partly led
The light beam that body laser 16 is sent out, which passes sequentially through, resolves into two-beam after the polarizer 17, sample cell 18, wollaston prism 19, and one
Shu Guang enters the first photoelectric converter 20, and another beam enters the second photoelectric converter 21.
Circuit part include be followed successively by the first photoelectric converter 20 and the second photoelectric converter 21, differential amplifier circuit 22,
Frequency selection circuit 23, envelope detection circuit 24, amplitude limit clamp circuit 25, A/D conversion circuits 26, microprocessor unit 27, stepping electricity
Machine 28, signal generating circuit 29.Microprocessor unit 27 includes that data storage cell, data processing unit and number display are single
Member；The high-frequency signal that signal generating circuit 29 generates is loaded on Frequency Adjustable semiconductor laser 16, while to stepper motor 28
Drive signal is sent out, stepper motor 28 connects the polarizer 17, and the polarizer 17 is driven to rotate；
The electric signal of first photoelectric converter 20 and photoelectric converter 21 is input to differential amplifier circuit 22 and carries out difference fortune
It calculates and amplifies, the difference signal that differential amplifier circuit 22 exports is successively through frequency selection circuit 23, envelope detection circuit 24, amplitude limit clamper
The data storage cell that digital signal is input in microprocessor unit 27 is converted to after circuit 25, A/D conversion circuits 26, it is optional
, display unit 33 is digital display unit, and the signal that microprocessor data processing unit stores storage unit is handled
Result digital display unit is output to afterwards to show.
For preferred light source 16 using Frequency Adjustable semiconductor laser 16, signal generating circuit 29 generates the square wave that frequency is f
Signal is loaded on Frequency Adjustable semiconductor laser 16, and laser output power is adjustable.The light that frequency is f passes through the polarizer
After 17, become linearly polarized light, linearly polarized light rotates after the optical rotatory substance in sample cell 18, using wollaston prism 19
After be broken down into two beam polarised lights.Two beam polarised lights are received by the first photoelectric converter 20 and the second photoelectric converter 21 respectively.
Frequency of the linearly polarized light after determinand and wollaston prism 19 is constant, so the first photoelectric converter 20 and the second photoelectricity
It is f electric signals that the optical signal that two beam frequencies are f is changed into two class frequencys by converter 21 respectively, and two groups of electric signals are separately input to
Two input terminals of differential amplifier circuit 22, differential amplifier circuit 22 turn for calculating from the first photoelectric converter 20 and the second photoelectricity
The difference for the electric signal that parallel operation 21 inputs simultaneously amplifies difference, and amplified difference electric signal is to drive frequency selection circuit 23, frequency-selecting
The signal that circuit 23 is used to that frequency to be selected to filter out other frequencies for the signal of f removes noise jamming.Signal passes through envelope detection
Digital signal is converted to after circuit 24, amplitude limit clamp circuit 25, A/D conversion circuits is input to microprocessor unit 27 and by micro-
Reason device digital storage unit records the signal.Signal generating circuit 29 sends out signal Driving Stepping Motor 28 and drives the polarizer
17 rotate 90 degree from optical null.Every turn of stepper motor 28 moves a step, and frequency is the polarization angle of the optical signal of f with the polarizer 17
Angle just change, cause the amplitude size of the two-beam signal exported by wollaston prism 19 to change, by
In two-beam signal amplitude variation tendency on the contrary, therefore sensitivity higher.By opto-electronic conversion, differential amplification, frequency-selecting amplification, mould
After number conversion, by the live signal of two-beam difference under microprocessor data unit records.When stepper motor 28 turns over 90
After degree, microprocessor carries out data processing to the difference signal recorded, and carries out FFT fast Fourier decomposition first, then again
By digital filtering, obtains one finally by the method for envelope detection and turn about the amplitude and stepper motor that frequency is f signals
The curve of dynamic angle.
The difference of the two beam polarised light light intensity decomposited from wollaston prism is I=I0Sin2 (θ+α), wherein θ are step
The rotational angle of stepper motor, α are angle of rotation.It is the curve as shown in Fig. 5 (a) if α > 0, in the curve theory；If α <0,
It is the curve as shown in Fig. 5 (b) in the curve theory.Data are fitted, corresponding angle when curve zero crossing is calculated
Value β, it is the angle of rotation α=90 °-β of substance from positive to negative that curve, which crosses zero direction, curve cross zero direction be from negative to positive, substance
Angle of rotation α=- β.The angle and known international standard are compared by data processing unit again, calculate the solution concentration.Most
It is shown afterwards by number and exports result.
High-frequency signal is generated using signal generating circuit to be modulated optical signal, the purpose very high tune of frequency in order to obtain
Signal processed, avoids Hz noise.In traditional polarimeter, analyzer is driven to be automatically rotated to optical null using servo motor
Principle, and in the present invention, signal generating circuit 29 generates signal Driving Stepping Motor 28 and the polarizer 17 is driven to be rotated by 90 °, then
The signal data recorded is handled by microprocessor, obtains one about light intensity difference and stepper motor rotational angle
Curve, by the zero-crossing values of curve with cross zero direction, the optical activity of substance is calculated from curve.It is calculated and is revolved using the present invention
Optic angle, stepper motor is rotated around same direction always in detection, is compared traditional technology, can be eliminated the influences such as motor hysterisis error,
Optics zero accurately is found out, greatly improves the precision of polarimeter.Also, difference is formed using wollaston prism 19 in the present invention
Dynamic test format eliminates the fixed influence of flashing, improves instrumental sensitivity, effectively prevent due to light source or instrument and equipment
Zero drift in main amplifier caused by equal aging actions, greatly improves measurement accuracy.
Alternatively, the microcontroller of processor unit selection model STM32F030；Stepper motor selects model
The motor of FY42EL180A.
The measurement method of optical rotatory substance angle of rotation is measured, its step are as follows:
1) optical-circuit balance is adjusted, keeps the polarizer 17 and wollaston prism 19 orthogonal and fixed；
2) after optical rotatory substance is added in sample cell 18, light is decomposed into two-beam, two-beam difference by the light path part
The first photoelectric converter 20 and the second photoelectric converter 21 are reached, what is exported from two photoelectric converters is two high-frequency ac letters
Number；
3) two groups of AC signals through 22 calculating difference of differential amplifier circuit and amplify, the frequency-selecting of frequency selection circuit 23, envelope examine
The data storage list that digital signal is input to microprocessor unit 27 is converted into after wave 24, amplitude limit clamper 25, A/D conversion circuits
Member.
4) stepper motor 28 drives the polarizer 17 to rotate, and the AC signal intensity of photoelectric converter changes, microprocessor
Device records each signal, and the curve of two-beam difference is obtained by FFT and envelope detection, finally using curve zero-crossing values and
Zero passage direction calculating obtains angle of rotation and then learns solution concentration.
Claims (7)
1. a kind of polarimeter based on differential zero passage detection, it is characterised in that：It includes being set gradually from side to the other side
Light source（16）, the polarizer（17）, sample cell（18）, prism（19）, photoelectric converter, wherein photoelectric converter include the first light
Electric transducer（20）, the second photoelectric converter（21）；First photoelectric converter（20）, the second photoelectric converter（21）Output end
With processing of circuit unit（30）In differential amplifier circuit（22）Input terminal connection；Processing of circuit unit（30）Including difference
Amplifying circuit（22）With differential amplifier circuit（22）The frequency selection circuit of output end connection（23）With frequency selection circuit（23）Output end
The envelope detection circuit of connection（24）With envelope detection circuit（24）The A/D conversion circuits of output end connection（26）, processing of circuit
Unit（30）Output end and processor unit（27）Input terminal connection；Including signal generating circuit（29）, signal occurs electric
Road（29）Signal output end respectively with light source（16）, motor（28）Controlled end connection, motor（28）Armature spindle be polarized
Device（17）Connection.
2. a kind of polarimeter based on differential zero passage detection according to claim 1, it is characterised in that：The processor list
Member（27）Including data storage cell（31）With data storage cell（31）The data processing unit of output end connection（32）, with
And and data processing unit（32）The display unit of output end connection（33）.
3. a kind of polarimeter based on differential zero passage detection according to claim 2, which is characterized in that when measuring, adopt
Use following steps：
1) light path is adjusted, and adjusts the polarizer（17）And prism（19）, make the polarizer（17）And prism（19）It is in quadrature position
And it is fixed；
2) in sample cell（18）After middle addition optical rotatory substance, by signal generating circuit（29）The square-wave signal that frequency is f is generated, and
It is loaded into Frequency Adjustable semiconductor laser（16）On, the light that frequency is f passes through the polarizer（17）Become linearly polarized light, linear polarization afterwards
Light passes through sample cell（18）In optical rotatory substance retrodeviate polarization state and rotate, using prism（19）After be broken down into two-beam letter
Number, two-beam signal is respectively by the first photoelectric converter（20）, the second photoelectric converter（21）It receives, photoelectric converter is by two
The optical signal that frequency is f is changed into the AC signal that frequency is f；
3）Two AC signals that photoelectric converter output frequency is f are in circuit part through differential amplifier circuit（22）Calculate two
The difference of signal, then through frequency selection circuit（23）, envelope detection circuit（24）, amplitude limit clamp circuit（25）, A/D conversion circuits（26）
Microprocessor unit is stored in the input of digital signal form afterwards（27）In data storage cell；
4）Signal generating circuit（29）Send out signal Driving Stepping Motor（28）Drive the polarizer（17）Rotation, photoelectric converter
AC signal intensity changes, and repeats step 3）, each signal of microprocessor data unit records storage；
5）Microprocessor handles the digital signal of storage, and solution concentration is learnt by calculating angle of rotation.
4. a kind of polarimeter based on differential zero passage detection according to claims 1 to 3, it is characterised in that：The prism
（19）For wollaston prism.
5. a kind of polarimeter based on differential zero passage detection according to claims 1 to 3, it is characterised in that：The motor
（28）For stepper motor.
6. a kind of polarimeter based on differential zero passage detection according to claim 3, it is characterised in that：In step 5）In lead to
Quick Fourier decomposition is crossed, then digital filtering again, the amplitude and step of differential wave are obtained finally by the method for envelope detection
The curve of stepper motor rotational angle calculates curve zero-crossing values by curve matching and crosses zero direction, calculates angle of rotation and then obtains
Know solution concentration.
7. a kind of polarimeter based on differential zero passage detection according to claim 3 or 6, it is characterised in that：In step 5）
The middle optical direction that sample is obtained according to zero direction excessively.
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| JPH11258154A (en) * | 1998-03-16 | 1999-09-24 | Matsushita Electric Ind Co Ltd | Optical rotation measuring apparatus |
| US20050128482A1 (en) * | 2003-10-10 | 2005-06-16 | Gibbs Phillip R. | Differential optical technique for chiral analysis |
| JP2012083311A (en) * | 2010-10-14 | 2012-04-26 | Horiba Ltd | Polarimeter |
| US20140039282A1 (en) * | 2012-08-06 | 2014-02-06 | Seiko Epson Corporation | Concentration measuring device and a method of controlling the concentration measuring device |
| JP2014130046A (en) * | 2012-12-28 | 2014-07-10 | Seiko Epson Corp | Method for measuring optical rotation, method for measuring component concentration, device for measuring optical rotation and medical equipment |
| CN105300891A (en) * | 2015-11-17 | 2016-02-03 | 上海理工大学 | Laser frequency-modulation two-optical-path polarimeter based on central algorithm and measuring method |
| CN208350621U (en) * | 2018-07-19 | 2019-01-08 | 湖北汽车工业学院 | A kind of polarimeter based on differential zero passage detection |
-
2018
- 2018-07-19 CN CN201810797314.7A patent/CN108709860A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6183924A (en) * | 1984-09-29 | 1986-04-28 | Shimadzu Corp | Optical rotary power property measuring apparatus |
| JPH11258154A (en) * | 1998-03-16 | 1999-09-24 | Matsushita Electric Ind Co Ltd | Optical rotation measuring apparatus |
| US20050128482A1 (en) * | 2003-10-10 | 2005-06-16 | Gibbs Phillip R. | Differential optical technique for chiral analysis |
| JP2012083311A (en) * | 2010-10-14 | 2012-04-26 | Horiba Ltd | Polarimeter |
| US20140039282A1 (en) * | 2012-08-06 | 2014-02-06 | Seiko Epson Corporation | Concentration measuring device and a method of controlling the concentration measuring device |
| JP2014130046A (en) * | 2012-12-28 | 2014-07-10 | Seiko Epson Corp | Method for measuring optical rotation, method for measuring component concentration, device for measuring optical rotation and medical equipment |
| CN105300891A (en) * | 2015-11-17 | 2016-02-03 | 上海理工大学 | Laser frequency-modulation two-optical-path polarimeter based on central algorithm and measuring method |
| CN208350621U (en) * | 2018-07-19 | 2019-01-08 | 湖北汽车工业学院 | A kind of polarimeter based on differential zero passage detection |
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