CN104406544B - Detection device and method for eliminating photoelastic modulator and environment influence based on double beam difference - Google Patents
Detection device and method for eliminating photoelastic modulator and environment influence based on double beam difference Download PDFInfo
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Abstract
The invention relates to a detection device and method for eliminating photoelastic modulator and environment influence based on double beam difference. The detection device for eliminating the photoelastic modulator and environment influence based on double beam difference comprises an optical module and a measuring module, and the optical module is composed of a laser, a polarizer, a beam splitter, a photoelastic modulator and a polarization analyzer; the measuring module is composed of two photoelectric detectors, a phase-locked amplifier and a digital signal processing system. The detection device and method for eliminating the photoelastic modulator and environment influence based on double beam difference are characterized in that two beams of light with the same state are converted into electric signals through the photoelectric detector after passing through the same photoelastic modulator, the electric signals are analyzed through the phase-locked amplifier and digital signal processing system to obtain modulation amplitudes and residual stress double-refraction angles corresponding to the two light beams, and the analyzed two ways of signals are performed with difference treatment to eliminate unsteady factors caused by the photoelastic modulator and environment change. By means of the detection device and method for eliminating the photoelastic modulator and environment influence based on double beam difference, the detectable signal-to-noise ratio and signal stability are greatly improved in the photoelastic modulation detection.
Description
Technical field
The present invention relates to field of optical detection, particularly a kind of to eliminate light ball modulator and environment shadow based on dual-beam difference
Loud detection means and method.
Technical background
High frequency modulated is carried out to line polarized light using light ball modulator, incident polarization light beam plane of polarization is effectively increased small
The detection of the anglec of rotation, has isolated the noise that low frequency, 1/f, slow drift are brought.Especially some need system it is steady in a long-term should
With field, the stability of modulation detection system itself is critically important.
In photoelastic modulation detection, the performance of manipulator directly affects the output of detection signal.And light ball modulator residual stress
The birefringence for causing is the leading indicator for reacting light ball modulator performance, and during systematic survey, which easily receives external environment such as
The impact of temperature, vibration etc., causes test signal to change therewith and unstable factor occurs, therefore should give in use
Remove.
In SPIE documents (Baoliang (Bob) Wang, Emily Hinds and Erica Krivoy, Basic
Optical Properties Of The Photoelastic Modulator PartⅡ:Residual
Birefringence in the Optical Element, 2009.746110-746110-8) in mention light ball modulator by
Unavoidably there is stress birfringence in material and architectural characteristic.This stress will directly affect in device beam propagation characteristic and
Modulating performance, does not mention the birefringent method of removal light ball modulator residual stress in the literature.But in small-signal
During detection, as light ball modulator stress birfringence is more significantly but can not be ignored with the impact that environmental change brings, the present invention
Aim to solve the problem that photoelastic modulation device itself and environmental change bring the unstability of test signal.
The content of the invention
Present invention aim at solving photoelastic modulation device brings detection signal instability problem, propose a kind of based on double light
Beam difference eliminates the detection means and detection method of photoelastic modulation and environmental effect.The device includes light source module and measurement mould
Block, the two paths of signals of incident light ball modulator is resolved the remaining angle for obtaining device at same position, difference processing is carried out, effectively
Eliminate the impact that modulation device itself and environment bring.
To reach above-mentioned purpose, the technical solution of the present invention is as follows：
A kind of detection means that light ball modulator and environmental effect are eliminated based on dual-beam difference, including optical module and survey
Amount module two parts, optical module by LASER Light Source, the polarizer, laser power stability module, depolarization Amici prism, two/
One wave plate, the first reflecting mirror, the second reflecting mirror, the 3rd reflecting mirror, light ball modulator, photoelastic controller and analyzer composition；Survey
Amount module is made up of the first photodetector, the second photodetector, lock-in amplifier and signal acquiring and processing system.On
The position relationship for stating components and parts is as follows：
The light of laser emitting becomes line polarized light through the polarizer, laser power is entered by laser power stability module
Row stability contorting；Line polarized light is divided into two beams through depolarization Amici prism by line polarized light, wherein the first light beam directly leads to
Cross periodic its peak phase retardation of phase-modulation of light ball modulator introducing and operation wavelength is set by photoelastic controller, Jing
Light after light ball modulator phase-modulation enters analyzer, and the light of Jing outgoing enters first the first light beam light of photodetectors register
It is strong and be changed into signal of telecommunication input lock-in amplifier；The second light beam from depolarization Amici prism outgoing is through 1/2nd wave plates
Phase compensation is carried out to the direction of line polarized light, the light of process sequentially passes through the first reflecting mirror, the second reflecting mirror, the 3rd reflecting mirror
Modulated into light ball modulator, the light of outgoing sequentially enters analyzer, and the light of Jing outgoing enters the second photodetector；Record
Second light beam light intensity is simultaneously changed into signal of telecommunication input lock-in amplifier；Ginseng is provided to lock-in amplifier by described photoelastic controller
Examine signal and be connected with its reference signal input；Lock-in amplifier outputs signal to signal acquiring and processing system；
The light transmission shaft of the polarizer is in 45 ° of angles with light ball modulator vibration direction of principal axis；The vibrating shaft of light ball modulator
It is in -45 ° of angles with analyzer light transmission shaft；Polarizer light transmission shaft is orthogonal in 90 ° with analyzer light transmission shaft.
The described detection means for eliminating light ball modulator itself and environmental effect based on dual-beam difference eliminates photoelastic tune
The detection method of device processed itself and environmental effect.It is characterized in that the method is comprised the following steps：
A. build the above-mentioned photoelastic modulation detection means based on dual-beam difference.Adjustment Jing depolarization Amici prisms are separated
The first light beam incidence light ball modulator position should be same with the position that light ball modulator is incided through three reflecting mirrors
Position；/ 2nd wave plate angles of adjustment make the polarization direction of the second light beams of Jing depolarization Amici prisms and the first light beam one
Cause；The first light beam and the second light beam power phase into light ball modulator are made by the selection and angle adjustment of components and parts in light path
Deng.
B. described light ball modulator determines its peak phase retardation by setting the panel parameter of photoelastic controller, the
One photodetector and the second photodetector convert optical signals to the signal of telecommunication and are input to lock-in amplifier, while photoelastic control
The reference signal of light ball modulator is input to device processed the reference signal input of lock-in amplifier；By lock-in amplifier and letter
Number collection obtains the fundamental component V of the first beam output signal with processing system11With harmonic V12, and the output of the second light beam
The fundamental component V of signal21And harmonic V21；
C. the fundamental component and harmonic of the first light beam and the second light beam carries out resolving and obtains expressions below：
Wherein, I0For the single beam laser power of depolarization Amici prism decile, V1(αm1) it is the first beam signal modulated amplitude
Degree, V1(α01) it is the first beam signal residual birefringence angle；V2(αm2) it is the second beam signal modulation amplitude, V2(α02) it is second
Beam signal residual birefringence angle；
The result that the two paths of signals for obtaining is carried out difference processing is as follows,
Δ V=V1(α01)-V2(α02)
As in the method, two pencil state identical light are 0 by same light ball modulator, in theory Δ V, however it is real
Test middle two-beam power can not be completely secured it is equal, the Δ V of resolving be close to zero constant value, signal processing can be passed through in the detection
Method cuts.The unstable factor caused because of light ball modulator (9) and environmental change in the device can be removed by the method.
The technique effect of the present invention is as follows：
After using the present invention, by two light beam difference by detection signal because light ball modulator and environmental change cause signal
Unstable factor remove, it is ensured that the stability of detecting system itself.
Description of the drawings
Fig. 1 is that the present invention implements structural frames based on the detection means that dual-beam difference eliminates light ball modulator and environmental effect
Figure；
Fig. 2 is methods ＆＆ steps of implementation flow chart of the present invention.
Specific embodiment
Fig. 1 is that the present invention implements knot based on the detection means that dual-beam difference eliminates light ball modulator itself and environmental effect
Structure block diagram.As seen from the figure, the present invention implements knot based on the detection means that dual-beam difference eliminates light ball modulator and environmental effect
Structure block diagram includes optical module and measurement module, optical module by LASER Light Source 1, the polarizer 2, laser power stability module 3, disappear
Polarization splitting prism 4,1/2nd wave plates 5, the first reflecting mirror 6, the second reflecting mirror 7, the 3rd reflecting mirror 8, light ball modulator 9,
Photoelastic controller 10 and analyzer 11 are constituted；Measurement module is mutually put by the first photodetector 12, the second photodetector 13, lock
Big device 14, signal acquiring and processing system 15 are constituted.The position relationship of above-mentioned components and parts is as follows：
The light of 1 outgoing of laser instrument becomes line polarized light through the polarizer 2, by laser power stability module 3 to laser work(
Rate carries out stability contorting；Line polarized light is divided into two beams through depolarization Amici prism 4, wherein the first light beam is directly by photoelastic
Manipulator 9 introduces periodic phase-modulation, and the peak phase retardation and operation wavelength of the light ball modulator 9 is by photoelastic control
Device 10 sets, and the light incidence analyzer 11 Jing after 9 phase-modulation of light ball modulator, the light of 11 outgoing of Jing analyzers enter the first light
Electric explorer 12；The second light beam separated from depolarization Amici prism 4 enters to the direction of line polarized light through 1/2nd wave plates 5
Line phase is compensated, and is sequentially passed through the first reflecting mirror 6, the second reflecting mirror 7, the 3rd reflecting mirror 8 by the light of 1/2nd wave plates 5 and is entered
Enter light ball modulator 9, the light after 9 phase-modulation of light ball modulator enters analyzer 11, the light of 11 outgoing of Jing analyzers enters
Enter the second photodetector 13；The record Jing of first photodetector 12 light ball modulators 9 are directly transmitted from 11 outgoing of analyzer
First light beam light intensity is simultaneously changed into signal of telecommunication input lock-in amplifier 14；Second photodetector 13 is recorded through the first reflecting mirror
6th, the second reflecting mirror 7,8 Jing light ball modulators 9 of the 3rd reflecting mirror into 11 outgoing of analyzer the second light beam light intensity and be changed into
The signal of telecommunication is input into lock-in amplifier 14；Reference signal is provided to lock-in amplifier 14 and joined with which by described photoelastic controller 10
Examine signal input part to be connected；Lock-in amplifier 14 outputs signal to signal acquiring and processing system 15, demodulated to obtain output letter
Number fundamental component and harmonic.
The polarization axle of the described polarizer 2 is in 45 ° of angles with the vibration direction of principal axis of light ball modulator 9；Light ball modulator 9 shakes
Moving axis is in -45 ° of angles with 11 polarization axle of analyzer；2 polarization axle of the polarizer is orthogonal in 90 ° with 11 polarization axle of analyzer.
The described detection means for eliminating light ball modulator and environmental effect based on dual-beam difference can eliminate photoelastic tune
The unstable factor that device processed and environmental change cause, the method implementation steps flow process are shown in Fig. 2, comprise the following steps：
A. build the above-mentioned photoelastic modulation detection means based on dual-beam difference.The light of 1 outgoing of laser instrument is through the polarizer 2
Become line polarized light, two beams are divided into through depolarization Amici prism 4, wherein the first light beam is directly drawn by light ball modulator 9
Enter periodic phase-modulation, the light incidence analyzer 11 after modulation, the light of outgoing enter the first photodetector 12；Wherein
Two light beams sequentially pass through the first reflecting mirror 6, the second reflecting mirror 7, the 3rd reflecting mirror 8 through 1/2nd wave plates 5 and enter photoelastic tune
Device processed 9, the light after modulation enter analyzer 11, and the light of outgoing enters the second photodetector 13.
Should be noted that the first light beam incidence that adjustment Jing depolarizations Amici prism 4 is separated is photoelastic in debugging process
The position of manipulator 9 should be in same position with the position for inciding light ball modulator 9 through three reflecting mirrors；Adjustment 1/2nd
5 angle of wave plate makes the polarization direction of the second light beams of Jing depolarizations Amici prism 4 consistent with the first light beam；By unit in light path
The selection of device and angle adjustment make the first light beam and the second light beam power into light ball modulator 9 equal.
B. by setting the panel parameter of photoelastic controller 10, described light ball modulator 9 determines that its peak phase postpones
The light intensity signal of light beam is converted to voltage signal and is linked into lock phase by amount, the first photodetector 12 and the second photodetector 13
Amplifier 14, while the reference signal of light ball modulator 9 to be input to photoelastic controller 10 reference signal of lock-in amplifier 14
Input；The fundamental component V of the first light beam is obtained by lock-in amplifier 14 and signal acquiring and processing system 1511Frequency division again
Amount V12, and the fundamental component V of the second light beam21With harmonic V22；
C. the fundamental component and harmonic of the first light beam and the second light beam are resolved, respectively obtains two-beam signal
Corresponding modulation amplitude and remaining angle, by expressions below：
D. difference processing is carried out to the corresponding remaining angle of two-beam signal that obtains of resolving, the device that has been eliminated fluctuation and
The signal of environmental effect, is expressed as follows,
Δ V=V1(α01)-V2(α02)
As in method, two pencil state identical light are 0 by same light ball modulator, in theory event Δ V, due to reality
Middle two-beam power is tested it cannot be guaranteed that essentially equal, the Δ V of resolving be close to zero constant value, can be subtracted by signal processing method
Fall.The unstable factor brought because of light ball modulator itself and environmental change in the device can be eliminated by the method.
Implementation of the present invention is specific as follows：
The polarization state change of linearly polarized light beam components and parts in light path is analyzed using Jones matrix, monochromater 1 goes out
The light beam penetrated becomes line polarized light after the polarizer 2, and line polarized light Jones matrix can be expressed as：
2 light transmission shaft of the polarizer is at 45 ° with coordinate axess y, and its Jones matrix can be expressed as：
The vibrating shaft of light ball modulator 9 and y angles are 0 °, and its Jones matrix can be expressed as：
Phase-delay quantities of the wherein δ for light ball modulator 9, which is Sine Modulated, can be expressed as δ=α0+αmsin(ωmT),
Wherein α0For the residual stress double refraction angle of light ball modulator 9, αmFor the peak phase retardation of light ball modulator 9, ωmIt is to adjust
Frequency processed.
With y into -45 ° of angles, its Jones matrix can be expressed as 11 light transmission shaft of analyzer：
The intensity signal that photodetector is obtained after analyzer 11 is：
Wherein I0It is the every beam laser intensity through depolarization Amici prism decile；
The described two-beam strongly expressed after analyzer 11 is as follows：
Trigonometric function sin δ and cos δ can be transformed into by Bessel function by Jacobi-An Geer identities and Euler's formula：
Wherein J0(α) it is zero Bessel function with regard to α, J2k-1(α) it is 2k-1 rank Bessel functions with regard to α,
J2k(α) it is 2k rank Bessel functions with regard to α.
Formula (8), (9) are brought into Bessel function brings formula (6) into and (7) abbreviation omits higher order term and constant value item is obtained
Arrive：
Wherein, I1It is the light intensity obtained into the first photodetector, I2It is the light obtained into the second photodetector
Intensity；α01It is that the first light beam corresponds to light ball modulator remnants angles, αm1It is the first light beam correspondence light ball modulator modulation amplitude；α02
It is that the second light beam corresponds to light ball modulator remnants angles, αm2It is the second light beam correspondence light ball modulator modulation amplitude；ωmIt is photoelastic tune
Frequency processed.
The first described photodetector 12 and the second photodetector 13 convert optical signal into the signal of telecommunication, by locking phase
The demodulation of amplifier 14 respectively obtains the fundamental component V of the first beam signal11With harmonic V12, and the second beam signal
Fundamental component V21With frequency multiplication V22It is as follows：
Wherein, the peak phase retardation of light ball modulator 9 is set by photoelastic controller 10, and light intensity is filled by power stability
Putting carries out stable, I0Can measure in advance.
The fundamental frequency of two beam signals is respectively obtained by described lock-in amplifier 14 and signals collecting and processing system 15
And harmonic, resolving is carried out to which and obtains following formula：
Δ V=V1(α01)-V2(α01) (20)
Wherein, V1(αm1) it is the first beam signal modulation amplitude, V1(α01) it is the first beam signal residual birefringence angle；V2
(αm2) it is the second beam signal modulation amplitude, V2(α02) it is the second beam signal residual birefringence angle；Due to two beams in the method
By same light ball modulator, experiment test Δ V is constant value to state identical light, therefore can be cut by signal processing method.
The unstable factor that light ball modulator itself and environmental change bring in the device can be removed by the method.Explanation of the invention
The content not being described in detail in book belongs to prior art known to professional and technical personnel in the field.
Claims (2)
1. a kind of detection means that light ball modulator and environmental effect are eliminated based on dual-beam difference, it is characterised in which includes light
Module and measurement module two parts are learned, optical module by the laser instrument (1), light transmission shaft angle set gradually along systematic optical axis is
45 ° of the polarizer (2), laser power stability module (3), depolarization Amici prism (4), 1/2nd wave plates (5), the first reflection
Mirror (6), the second reflecting mirror (7), the 3rd reflecting mirror (8), the light ball modulator (9) that fast axle angle is 0 °, photoelastic controller (10)
With analyzer (11) composition that light transmission shaft angle is -45 °；Measurement module is by the first photodetector (12), the second photodetection
Device (13), lock-in amplifier (14) and signal acquiring and processing system (15) composition, the position relationship of above-mentioned components and parts are as follows：
The light of laser instrument (1) outgoing becomes line polarized light through the polarizer (2), using the bypass light beam from the polarizer (2) outgoing
The stability contorting of laser power is realized with laser power stability module (3)；The polarizer (2) is entered along the light that system primary optical axis are passed through
Depolarization Amici prism (4), its light beam are divided into two beams, wherein the first light beam is directly entered light ball modulator (9) introduces week
The phase-modulation of phase property, the peak phase retardation and operation wavelength of the light ball modulator (9) are set by photoelastic controller (10),
Light Jing after light ball modulator (9) phase-modulation enters analyzer (11), and the light of Jing analyzers (11) outgoing enters the first photoelectricity
Detector (12)；Phase of the second light beam separated from depolarization Amici prism (4) through 1/2nd wave plates (5) to line polarized light
Position compensates, and sequentially passes through the first reflecting mirror (6), the second reflecting mirror (7), the 3rd anti-by the light of 1/2nd wave plates (5)
Mirror (8) is penetrated into light ball modulator (9), the light after light ball modulator (9) phase-modulation enters analyzer (11), Jing analyzings
The light of device (11) outgoing enters the second photodetector (13)；First photodetector (12) record is directly entered bullet manipulator
(9) the first light beam light intensity of Jing analyzers (11) outgoing and be changed into the signal of telecommunication input lock-in amplifier (14)；Second smooth electrical resistivity survey
Survey device (13) record to enter through the first reflecting mirror (6), the second reflecting mirror (7), the 3rd reflecting mirror (8) Jing light ball modulators (9)
Second light beam light intensity of analyzer (11) outgoing is simultaneously changed into signal of telecommunication input lock-in amplifier (14)；By described photoelastic control
Device (10) provides reference signal to lock-in amplifier (14)；Lock-in amplifier (14) outputs signal to signal acquiring and processing system
(15)；The light transmission shaft of the polarizer (2) is in 45 ° of angles with light ball modulator (9) vibration direction of principal axis；Light ball modulator (9)
Vibrating shaft is in -45 ° of angles with analyzer (11) light transmission shaft；The polarizer (2) light transmission shaft and analyzer (11) light transmission shaft in 90 ° just
Hand over.
2. eliminated using the detection means for eliminating light ball modulator and environmental effect based on dual-beam difference described in claim 1
The detection method of light ball modulator and environmental effect, it is characterised in that the method is comprised the following steps：
A. build the above-mentioned detection means that light ball modulator and environmental effect are eliminated based on dual-beam difference；Adjustment depolarization point
Light prism (4) outgoing the first light beam incidence light ball modulator (9) position with incide photoelastic modulation through three reflecting mirrors
The position of device (9) should be in same position；Adjustment 1/2nd wave plates (5) angle makes the polarization direction of the second light beam and the first light beam
Unanimously；The first light beam and the second light into light ball modulator (9) are caused by the selection and angle adjustment of components and parts in light path
Optical power beam is equal；
B. by setting the panel parameter of photoelastic controller (10), described light ball modulator (9) determines that its peak phase postpones
The optical signal of light beam is converted to signal of telecommunication input lock and is mutually put by amount, the first photodetector (12) and the second photodetector (13)
Big device (14), while the reference signal input of photoelastic controller (10) fundamental frequency reference signal input lock-in amplifier (14)；It is logical
Cross lock-in amplifier (14) and signal acquiring and processing system (15) obtains the fundamental component V of the first light beam11And harmonic
V12, and the fundamental component V of the second light beam21And harmonic V22；
C. to the first light beam and the fundamental component and harmonic of the second light beam, carry out following resolving：
Wherein, I0For the single beam laser power of depolarization Amici prism decile, V1(αm1) it is the first beam signal modulation amplitude, V1
(α01) it is the first beam signal residual birefringence angle；V2(αm2) it is the second beam signal modulation amplitude, V2(α02) it is the second light beam
Signal residual birefringence angle；
The two paths of signals for obtaining corresponding residual birefringence angle is carried out into difference processing as follows,
△ V=V1(α01)-V2(α02)
As in the method, two pencil state identical light are 0 by same light ball modulator, in theory △ V, but in experiment
Two-beam power cannot ensure it is essentially equal, the △ V of resolving be close to zero constant value, signal processing method can be passed through in the detection
Cut the signal of be eliminated light ball modulator and environmental effect.
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| CN104749136B (en) * | 2015-04-22 | 2017-10-17 | 山西大学 | Residual amplitude restraining device and method in FM Spectroscopy Measurement based on polarization rotation |
| US10048197B2 (en) * | 2015-04-28 | 2018-08-14 | Taiwan Biophotonic Corporation | Optical measurement device and optical measurement method |
| CN106371230B (en) * | 2016-08-29 | 2019-02-12 | 北京航空航天大学 | A kind of light ball modulator modulation amplitude closed-loop control system and control method based on second harmonic |
| CN113358604B (en) * | 2021-06-02 | 2022-11-01 | 天津大学 | Oblique incidence type spectral reflection differential measurement device and method |
| CN113959683B (en) * | 2021-10-25 | 2024-02-23 | 北京航空航天大学 | Deep modulation optical rotation angle detection device and method based on photoelastic modulator |
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