CN105675039A - Method for calibrating any peak delay amount of photoelastic modulator - Google Patents
Method for calibrating any peak delay amount of photoelastic modulator Download PDFInfo
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- CN105675039A CN105675039A CN201610025915.7A CN201610025915A CN105675039A CN 105675039 A CN105675039 A CN 105675039A CN 201610025915 A CN201610025915 A CN 201610025915A CN 105675039 A CN105675039 A CN 105675039A
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- peak
- light ball
- retardation
- ball modulator
- peak retardation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0128—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on electro-mechanical, magneto-mechanical, elasto-optic effects
- G02F1/0131—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
Abstract
The invention belongs to the technical field of signal modulation, and specifically relates to a method for calibrating the peak delay amount of a photoelastic modulator. The technical scheme that the method adopts is as follows: the photoelastic modulator is placed between two polarizers; incident light passes through a polarizer, the photoelastic modulator and an analyzer in sequence, and is then measured by a detector; the peak delay amount of the photoelastic modulator is set, and the detector obtains a waveform; and the waveform is output as a digital signal, and software is adopted to perform fitting on the waveform, thereby obtaining an actual value (i.e., a fitted value) of the peak delay amount. A set value required to obtain any peak delay amount is calculated based on a relation between a set value and an actual value of the peak delay amount. The method provided by the invention can calibrate any peak delay amount of the photoelastic modulator, and is mainly used for signal modulation technology and error correction.
Description
Technical field
The invention belongs to signal modulation technique field, be specifically related to the calibration steps of any peak retardation of light ball modulator.
Background technology
Light ball modulator is a kind of phase modulator based on photoelastic effect, there is the advantages such as clear aperature is big, full filed angle is big, modulating frequency is high, use wide waveband, driving voltage is low, power consumption is little, it is the core devices in polarization Modulation, has in fields such as biophysics, physical chemistry, crystal growth and be extremely widely applied.
Accurate calibration light ball modulator is to obtain the premise and basis accurately measured. Calibration light ball modulator generally adopts oscillograph signature waveform, fundamental component, second harmonic component or DC component to be zero or the method (PEM-100photoelasticmodulatorusermanual such as extreme value, single photon counting; AppliedOptics, 15,1960,1976; ThinSolidFilms, 455,78,2004.). Each method above-mentioned is all that single peak retardation is calibrated, when wherein peak retardation is the integral multiple of π, the waveform on oscillograph is " tack " or " flat " feature, when peak retardation is 2.405, DC component is zero, when peak retardation is 1.841, fundamental component amplitude is maximum, and when peak retardation is 5.136, second harmonic component is zero. For the calibration of single peak retardation, if the peak retardation that light ball modulator is capable of in some wavelength band is less than the peak retardation of timing signal, then cannot calibrate light ball modulator in this wavelength band. It addition, the fluctuation of light intensity also can have a strong impact on calibration accuracy. Complicated single photon counting technology cannot be practically applicable to the calibration of light ball modulator. Deficiency for above-mentioned various scaling methods, the present invention proposes a kind of new method of any peak position retardation of accurate calibration in the whole operation interval of light ball modulator, its optical system and signal processing be simple and calibration accuracy and incident intensity, optical element azimuth are unrelated, in addition the method is without phase-shifter, is very suitable for the accurate calibration of multi-wavelength, FR light ball modulator.
Summary of the invention
It is an object of the invention to provide the new method of a kind of any peak retardation of accurate calibration light ball modulator, be suitable for the accurate calibration of multi-wavelength, FR light ball modulator.
Calibrating principle is as follows:
When the light ball modulator that azimuth is 0 ° be placed in azimuth respectively between 45 ° and the polarizer and the analyzer of-45 ° time, the Changing Pattern of light intensity time that detector is measured is:
(1)
Wherein, I0It is incident intensity,It is peak retardation,It is the light ball modulator modulation angular frequency to incident illumination,Be the signal on detector over time. Oscilloscope measurementIt is output as digital waveform, adopts formula (1) to be fitted can be obtained by peak retardation to output waveform. This method can be used in the arbitrary peak retardation of accurate calibration。
The calibration steps of light ball modulator provided by the invention, concretely comprises the following steps:
(1) being arranged at by light ball modulator between the polarizer, analyzer, incident illumination sequentially passes through the polarizer, light ball modulator, analyzer, detector measure;
(2) peak retardation is set, detector obtains corresponding waveform; Numerical fitting waveshape signal obtains the actual value of peak retardation, and obtains the relation that peak retardation arranges between value and actual value further;
(3) according to the relation arranged between value and actual value, calculate to obtain value is set needed for any peak retardation.
In the present invention, the described polarizer and analyzer are polarizing prism, scatter-type polariser or dichroism linear polarization.
In the present invention, the described polarizer and the light transmission shaft of analyzer are misaligned with the vibrating shaft of light ball modulator.
In the present invention, described incident illumination is laser, electric filament lamp, mercury lamp.
In the present invention, described detector is able to the measurement instrument of output digit signals, including oscillograph and data acquisition board.
In the present invention, in the middle of described light ball modulator and analyzer, it is also possible to place the phase-shifter introducing fixed phase drift.
In the present invention, described phase-shifter is bubble Ke Ersi box, kerr cell, liquid crystal phase retardation device, wave plate, Babinet's compensator, Soret compensator or Berek compensator.
Accompanying drawing explanation
Fig. 1 is the index path of calibration light ball modulator.
The value that arranges that Fig. 2 is peak retardation is the waveform (open circles) when 2.513 and adoptsThe peak position retardation that Function Fitting (solid line) obtains is 2.627.
The value that arranges that Fig. 3 is peak retardation is the waveform (open circles) when 3.142 and adoptsThe peak position retardation that Function Fitting (solid line) obtains is 3.230.
The value that arranges that Fig. 4 is peak retardation is the waveform (open circles) when 4.398 and adoptsThe peak position retardation that Function Fitting (solid line) obtains is 4.515.
The linear relationship that Fig. 5 is peak retardation match value y and peak retardation arranges between value x is y=1.01*x+0.059.
Detailed description of the invention
The present invention is further described below by specific embodiment:
Embodiment 1:
The index path of calibration light ball modulator is as shown in Figure 1.
He-Ne Lasers is after the polarizing prism (polarizer) that azimuth is 45 °, it it is the light ball modulator of 0 ° through azimuth, then then through the polarizing prism (analyzer) that azimuth is-45 °, light incides on photodiode subsequently, and the signal of telecommunication of photodiode output is detected by oscillograph. Arranging the peak retardation on light ball modulator controller, the waveform on oscillograph changes therewith. Waveform on numeral output oscillograph. AdoptFunction Fitting obtains the match value of peak retardation. In the adjustable extent of peak retardation, gradually change peak retardation arrange value and successively matching acquisition correspondence peak retardation match value. The linear relationship that matching obtains the peak retardation match value in adjustable extent and peak retardation arranges between value. Actual value (i.e. match value) for any peak retardation, it is possible to value is set by what above-mentioned linear relationship was back-calculated to obtain peak retardation.
The value that arranges of peak retardation be waveform when 2.513 is open circles, adoptsThe peak position retardation that Function Fitting (solid line) obtains is 2.627.As shown in Figure 2.
The value that arranges of peak retardation be waveform when 3.142 is open circles, adoptsThe peak position retardation that Function Fitting (solid line) obtains is 3.230. As shown in Figure 3.
The value that arranges of peak retardation be waveform when 4.398 is open circles, adoptsThe peak position retardation that Function Fitting (solid line) obtains is 4.515. As shown in Figure 4.
It is y=1.01*x+0.059 that peak retardation match value y and peak retardation arrange the linear relationship between value x. As shown in Figure 5.
Claims (7)
1. a calibration steps for any peak retardation of light ball modulator, when the light ball modulator that azimuth is 0 ° be placed in azimuth respectively between 45 ° and the polarizer and the analyzer of-45 ° time, the Changing Pattern of light intensity time that detector is measured is:
(1)
Wherein, I0It is incident intensity,It is peak retardation,It is the light ball modulator modulation angular frequency to incident illumination,Be the signal on detector over time; Oscilloscope measurementIt is output as digital waveform, adopts formula (1) that output waveform is fitted, namely obtain peak retardation, concretely comprise the following steps:
(1) being arranged at by light ball modulator between the polarizer, analyzer, incident illumination sequentially passes through the polarizer, by light ball modulator, analyzer, detector measure;
(2) peak retardation is set, detector obtains corresponding waveform; Numerical fitting waveshape signal obtains the actual value of peak retardation, and obtains the relation that peak retardation arranges between value and actual value further;
(3) based on the relation arranged between value and actual value, calculate to obtain value is set needed for any peak retardation.
2. the calibration steps of any peak retardation of light ball modulator according to claim 1, it is characterised in that the described polarizer and analyzer are polarizing prism, scatter-type polariser or dichroism linear polarization.
3. the calibration steps of any peak retardation of light ball modulator according to claim 2, it is characterised in that the light transmission shaft of the polarizer and analyzer is misaligned with the vibrating shaft of light ball modulator.
4. the calibration steps of any peak retardation of light ball modulator according to claim 1, it is characterised in that described incidence comes from laser, electric filament lamp, mercury lamp.
5. the calibration steps of any peak retardation of light ball modulator according to claim 1, it is characterised in that detector be can the measurement instrument of output digit signals, including oscillograph, data acquisition board.
6. the calibration steps of any peak retardation of light ball modulator according to claim 1, it is characterised in that in the middle of described light ball modulator and analyzer, is also placed with the phase-shifter introducing fixed skew.
7. the calibration steps of any peak retardation of light ball modulator according to claim 6, it is characterized in that, described phase-shifter is bubble Ke Ersi box, kerr cell, liquid crystal phase retardation device, wave plate, Babinet's compensator, Soret compensator or Berek compensator.
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| CN201610025915.7A CN105675039A (en) | 2016-01-15 | 2016-01-15 | Method for calibrating any peak delay amount of photoelastic modulator |
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| CN201610025915.7A CN105675039A (en) | 2016-01-15 | 2016-01-15 | Method for calibrating any peak delay amount of photoelastic modulator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451072A (en) * | 2016-11-30 | 2017-02-22 | 中国科学院国家授时中心 | Liquid crystal tuned high power external cavity laser |
| CN107024278A (en) * | 2017-04-27 | 2017-08-08 | 北京航空航天大学 | The device and method of polarizer alignment error in a kind of small smooth swing angle detection of online elimination photoelastic modulation |
| CN107131902A (en) * | 2017-05-31 | 2017-09-05 | 北京航空航天大学 | A kind of scaling method for light ball modulator peak retardation |
| CN107976299A (en) * | 2017-11-15 | 2018-05-01 | 中北大学 | Consider the bullet optical modulator retardation calibration analysis method and device of spectral dispersion |
| WO2019137109A1 (en) * | 2018-01-09 | 2019-07-18 | 河北工业大学 | Color gamut widening device |
| CN110261070A (en) * | 2019-07-05 | 2019-09-20 | 北京航空航天大学 | A kind of light ball modulator caliberating device and method based on compound Bezier calibration function |
| CN110595620A (en) * | 2019-08-22 | 2019-12-20 | 南京理工大学 | Light wave polarization rapid modulation imaging device and method |
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| TW200606406A (en) * | 2004-08-09 | 2006-02-16 | Yu-Faye Chao | A calibration technique for phase retardation of photoelastic modulator with data acquisition system |
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2016
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TW200606406A (en) * | 2004-08-09 | 2006-02-16 | Yu-Faye Chao | A calibration technique for phase retardation of photoelastic modulator with data acquisition system |
Non-Patent Citations (3)
| Title |
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| MENG-WEI WANG 等: "Calibrations of Phase Modulation Amplitude of Photoelastic Modulator", 《JAPANESE JOURNAL OF APPLIED PHYSICS》 * |
| 周军 等: "光弹调制器定标新方法", 《光子学报》 * |
| 胡建明 等: "基于光弹调制技术的波片相位延迟量测量方法", 《光学学报》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451072A (en) * | 2016-11-30 | 2017-02-22 | 中国科学院国家授时中心 | Liquid crystal tuned high power external cavity laser |
| CN107024278A (en) * | 2017-04-27 | 2017-08-08 | 北京航空航天大学 | The device and method of polarizer alignment error in a kind of small smooth swing angle detection of online elimination photoelastic modulation |
| CN107024278B (en) * | 2017-04-27 | 2018-06-08 | 北京航空航天大学 | The device and method of polarizer installation error in a kind of small smooth swing angle detection of online elimination photoelastic modulation |
| CN107131902A (en) * | 2017-05-31 | 2017-09-05 | 北京航空航天大学 | A kind of scaling method for light ball modulator peak retardation |
| CN107131902B (en) * | 2017-05-31 | 2020-03-17 | 北京航空航天大学 | Calibration method for photoelastic modulator peak delay amount |
| CN107976299A (en) * | 2017-11-15 | 2018-05-01 | 中北大学 | Consider the bullet optical modulator retardation calibration analysis method and device of spectral dispersion |
| CN107976299B (en) * | 2017-11-15 | 2019-07-09 | 中北大学 | Consider the bullet optical modulator retardation calibration analysis method and device of spectral dispersion |
| WO2019137109A1 (en) * | 2018-01-09 | 2019-07-18 | 河北工业大学 | Color gamut widening device |
| CN110261070A (en) * | 2019-07-05 | 2019-09-20 | 北京航空航天大学 | A kind of light ball modulator caliberating device and method based on compound Bezier calibration function |
| CN110261070B (en) * | 2019-07-05 | 2020-07-03 | 北京航空航天大学 | Photoelastic modulator calibration device and method based on composite Bessel calibration function |
| CN110595620A (en) * | 2019-08-22 | 2019-12-20 | 南京理工大学 | Light wave polarization rapid modulation imaging device and method |
| CN110595620B (en) * | 2019-08-22 | 2021-07-13 | 南京理工大学 | Light wave polarization rapid modulation imaging device and method |
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