CN109211528A - Parameter calibration system and method for liquid crystal phase variable delayer - Google Patents
Parameter calibration system and method for liquid crystal phase variable delayer Download PDFInfo
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- CN109211528A CN109211528A CN201810834462.1A CN201810834462A CN109211528A CN 109211528 A CN109211528 A CN 109211528A CN 201810834462 A CN201810834462 A CN 201810834462A CN 109211528 A CN109211528 A CN 109211528A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000010287 polarization Effects 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000003993 interaction Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 description 6
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- 239000007788 liquid Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- 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
- G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
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Abstract
The invention belongs to the technical field of optical wavelength polarization control, and particularly relates to a parameter calibration system and method of a liquid crystal phase variable retarder, aiming at solving the problem of parameter calibration of the liquid crystal phase variable retarder under any wavelength and any phase retardation. The calibration system reads out the output value of the wavelength of the diffraction light which is wanted on a control computer which is connected with the spectrometer by tuning a radio frequency driver which is attached to the acousto-optic tunable filter; tuning the voltage tuning driver of the liquid crystal phase variable delayer, reading out the corresponding system output light intensity value from the control computer, and calculating the corresponding system output light intensity value according to the formulaCalculating the value of the phase delay quantity delta; the method comprises the steps of measuring the relation among a plurality of groups of diffraction light wavelengths, driving voltages and phase delay amounts in a tuning range, marking the point where each group of parameter values is located in a coordinate system, and fitting the wavelengths, the voltages and the phasesThe relationship curve of the retardation amounts of the three phases realizes the parameter calibration of the liquid crystal phase variable retarder under any wavelength and any phase retardation amount.
Description
Technical field
The invention belongs to optical wavelength polarization control technology fields, and in particular to a kind of parameter of liquid crystal variable retarder
Calibration system and method.
Background technique
Imaging polarization spectral technique is a kind of very important means for obtaining information, which can not only divide well
It distinguishes low reflecting region and the profile in target, but also can identify the three-dimensional letter of measured target under complicated background environment
Breath, this has very high application value in industry and agricultural.
Polarization Detection is further expanded on the light intensity of conventional detection, spectrum and space three-dimensional data basis, is increased
Degree of polarization, polarization azimuth, polarization ellipse rate and direction of rotation four dimensions.Determine that the polarization spectrum of object is special by self property
Property, relative to culture, the overall surface of the objects such as the Nature target such as forest, desert is more coarse, does not take turns significantly
Wide rule, so diffusing reflection phenomenon is presented in the radiant light of natural target or reflected light, so that linear polarization degree very little is almost
Zero.Imaging polarization Detection Techniques can be by man-made target from natural mesh using man-made target and this physical difference opposite sex of natural target
Distinguish in mark.The polarization characteristic of measured target is obtained during remote sensing with the changing rule of wavelength, so that it may obtain mesh
This dependence is usually referred to as the polarization spectrum feature of target by target surface physicochemical property.
Polarization information in Polarization Detection system is mentioned using polarizers such as wave plate, liquid crystal variable retarders
It takes.The use scope of wave plate is limited, is generally used for the stationary phase modulation of coherent laser.The wavelength of liquid crystal variable retarder
Tuning range is wide, and the modulation of any phase, in the Polarization Detection of wideband light source, application can be implemented under voltage driving
The most extensively.When using liquid crystal variable retarder, first have to demarcate it, i.e., to lambda1-wavelength, be attached to
The relationship between the phase-delay quantity on driving voltage and liquid crystal variable retarder on liquid crystal variable retarder
It is demarcated.Demarcating later liquid crystal variable retarder can just be used directly.The relationship demarcated between this three has
A variety of methods are generally divided into following two major classes: the first kind, to liquid crystal variable retarder under the light source of specific known wavelength
It is demarcated, such as laser.Since the coherence of laser is good and Wavelength stabilized, to common several phase-delay quantities, such as 2 π,
Pi/2, π/4 and 0 etc., are demarcated using the wave plate of known delay amount, such as full-wave plate, half-wave plate, quarter-wave
Piece；Second class calibrates the incident light of known wavelength with two polarizers, such as linear polarizer, Amici prism.This
The operation of two methods all very flexibly, but has limitation, if incident light is the very wide wideband light source of wave-length coverage, this
Both of which is undesirable.
Summary of the invention
It is an object of the invention to solve the parameter of liquid crystal variable retarder under any wavelength arbitrary phase delay amount
Problem of calibrating, and propose the parameter calibration system and method for a kind of liquid crystal variable retarder.
In order to complete above-mentioned purpose, specific technical solution of the invention is:
A kind of parameter calibration system of liquid crystal variable retarder, is characterized in that including light source, the light source
Input path be equipped with devating prism, the emitting light path of devating prism is equipped with liquid crystal variable retarder, liquid crystal phase
The emitting light path of variable delay device is equipped with acousto-optic tunable filter, and the emitting light path of acousto-optic tunable filter is equipped with light
Spectrometer；
Liquid crystal variable retarder voltage tuning driver is connected on the liquid crystal variable retarder, acousto-optic can
Radiofrequency launcher is connected in tuned filter；The liquid crystal variable retarder voltage tuning driver, radiofrequency launcher,
Spectrometer is connected with control computer respectively；
Incident beam successively enters acousto-optic tunable filter after devating prism and liquid crystal variable retarder, by
It controls computer control radio driver and generates high-frequency ultrasonic, the high-frequency ultrasonic and enter acousto-optic tunable filter
Acoustic optic interaction occurs for light beam, and light beam is divided into two diffraction lights and 0 grade of transmitted light, and the diffraction light is received by spectrometer, and 0 grade thoroughly
Penetrate the baffle cut-off that light is arranged between acousto-optic tunable filter and spectrometer.
Further, liquid crystal collimation unit is equipped between the light source and devating prism.
Further, light source intensity control device, the light source intensity control device and computer phase are connected on the light source
Even.
Meanwhile the invention proposes the parameter calibration method of above-mentioned liquid crystal variable retarder, it is characterized in that
The following steps are included:
1) open light source, make the polarization direction of incident beam along horizontal direction in acousto-optic tunable filter with ultrasound
Acoustic optic interaction occurs for wave, liquid crystal variable retarder is removed from optical path, and rotatory polarization prism, until on spectrometer
The diffraction intensity for receiving acousto-optic tunable filter is zero, and stop operating devating prism, is emitted at this time from devating prism inclined
Light polarization direction of shaking is just perpendicular to horizontal plane；
2) liquid crystal variable retarder is replaced between devating prism and acousto-optic tunable filter, and rotates liquid
Crystal phase position variable delay device, the stopping when diffraction intensity until receiving acousto-optic tunable filter on spectrometer is reduced to zero again
Rotation, the fast axle of liquid crystal variable retarder is along horizontal or vertical direction at this time；
3) clockwise or counterclockwise 45 ° again by liquid crystal variable retarder, liquid crystal variable retarder at this time
Fast axle and both horizontally and vertically all be in 45 °；
4) radio driver being attached on acousto-optic tunable filter is tuned, in the control computer connecting with spectrometer
It is upper to read desired diffraction optical wavelength output valve；
5) liquid crystal variable retarder voltage tuning driver is tuned, it is defeated to read corresponding system from control computer
Light intensity value out, by formulaCalculate the value of phase-delay quantity δ；
Wherein: n=0, ± 1, ± 2 ... ..., IoutFor system output intensity, ξ is the transmission of liquid crystal variable retarder
Rate, the transmissivity of acousto-optic tunable filter, the product of the transmissivity of devating prism and incident intensity；
6) step 4) is repeated in 5), obtains the multiple groups parameter value of voltage, wavelength and phase-delay quantity δ；
7) according to obtained phase-delay quantity δ value, the relation curve of fitting wavelength, voltage and phase-delay quantity.
Further, in step 1), the incident beam is carried out before entering devating prism using liquid crystal collimation unit
Collimation.
Further, in step 1), the exiting light beam intensity of light source is adjusted by light source intensity control device.
Compared with the prior art, the advantages of the present invention are as follows:
The radio driver that the present invention is attached on acousto-optic tunable filter by tuning, in the control being connect with spectrometer
Desired diffraction optical wavelength output valve is read on computer processed；Liquid crystal variable retarder voltage tuning driver is tuned, from
Corresponding system output light intensity values are read on control computer, by formulaCalculate phase delay
Measure the value of δ；By multiple groups diffraction optical wavelength, the relationship of driving voltage, phase-delay quantity in measurement tuning range, in a coordinate system
The point where every group of parameter value is marked, by fitting wavelength, the relation curve of voltage and phase-delay quantity three, to realize
The parameter calibration of liquid crystal variable retarder under any wavelength arbitrary phase delay amount.
Detailed description of the invention
Fig. 1 is the light path schematic diagram of the parameter calibration system of liquid crystal variable retarder of the present invention.
In figure: 1-light source；2-light source intensity control devices；3-liquid crystal collimation units；4-devating prisms；5-liquid crystalline phases
Position variable delay device；6-liquid crystal variable retarder voltage tuning drivers；7-acousto-optic tunable filters；8-radio frequencies
Driver；9-spectrometers；10-control computers；11-baffles.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in embodiment is clearly and completely described, the following examples are intended to illustrate the invention, but
It is not intended to limit the scope of the invention.
A kind of parameter calibration system of liquid crystal variable retarder, including light source 1, in the input path of the light source 1
Equipped with devating prism 4, liquid crystal collimation unit 3 is equipped between the light source 1 and devating prism 4, on the emitting light path of devating prism 4
Equipped with liquid crystal variable retarder 5, the emitting light path of liquid crystal variable retarder 5 is equipped with acousto-optic tunable filter 7,
The emitting light path of acousto-optic tunable filter 7 is equipped with spectrometer 9；
It is connected with light source intensity control device 2 on the light source 1, liquid crystal phase is connected on liquid crystal variable retarder 5
Variable delay device voltage tuning driver 6 is connected with radiofrequency launcher 8 on acousto-optic tunable filter 7；The intensity of light source control
Device 2 processed, liquid crystal variable retarder voltage tuning driver 6, radiofrequency launcher 8, spectrometer 9 respectively with control computer 10
It is connected；
Incident beam is after the collimation of liquid crystal collimation unit 3 successively after devating prism 4 and liquid crystal variable retarder 5
Into acousto-optic tunable filter 7, radio driver 8 is controlled by control computer 10 and generates high-frequency ultrasonic, the high frequency is super
Acoustic optic interaction occurs for sound wave and the light beam for entering acousto-optic tunable filter 7, and light beam is divided into two diffraction lights and 0 grade of transmission
Light, the diffraction light are received by spectrometer 9, and 0 grade of transmitted light is arranged between acousto-optic tunable filter 7 and spectrometer 9
Baffle 11 ends.
Present invention aims to lambda1-wavelength, the driving voltage and liquid that are attached on liquid crystal variable retarder
The relationship between three parameters of phase-delay quantity on the variable delay device of crystal phase position is demarcated, it is assumed that the polarization of incident light along
Just with ultrasonic wave acoustic optic interaction can occur for vertical direction in acousto-optic tunable filter, according to acousto-optic tunable filter
Driving frequency and diffraction optical wavelength one-to-one relationship, by tuning the ultrasound-driven that is attached on acousto-optic tunable filter
Frequency may be selected by desired diffraction optical wavelength output valve, and specific value can directly be read on spectrometer.
Based on above-mentioned parameter calibration system, the invention also provides a kind of parameter calibration sides of liquid crystal variable retarder
Method, comprising the following steps:
1) light source 1 is opened, keeps the polarization direction of incident beam in acousto-optic tunable filter 7 and super along horizontal direction
Acoustic optic interaction occurs for sound wave, liquid crystal variable retarder 5 is removed from optical path, and rotatory polarization prism 4, until spectrum
The diffraction intensity that acousto-optic tunable filter 7 is received on instrument 9 is zero, and stop operating devating prism 4, at this time from devating prism 4
The polarization light polarization direction of outgoing is just perpendicular to horizontal plane；
2) liquid crystal variable retarder 5 is replaced between devating prism 4 and acousto-optic tunable filter 7, and revolved
Turn liquid crystal variable retarder 5, the diffraction intensity until receiving acousto-optic tunable filter 7 on spectrometer 9 is reduced to again
It stops rotating when zero, the fast axle of liquid crystal variable retarder 5 is along horizontal or vertical direction at this time；
3) clockwise or counterclockwise 45 ° again by liquid crystal variable retarder 5, liquid crystal variable retarder at this time
5 fast axle and both horizontally and vertically all be in 45 °；
4) attached by tuning according to the driving frequency of acousto-optic tunable filter 7 and diffraction optical wavelength one-to-one relationship
The radio driver 8 being added on acousto-optic tunable filter 7 may be selected by desired diffraction optical wavelength output valve, specific value
It can directly be read on the control computer 10 being connect with spectrometer 9；
5) liquid crystal variable retarder voltage tuning driver 6 is tuned, liquid crystal variable retarder liquid crystal molecule
Arrangement mode will change, and generate corresponding phase delay, cause diffracted light intensity with being attached to liquid crystal phase variable
The variation of voltage value on delayer 5 and change, from control computer 10 on read corresponding system output light intensity values；
6) the system output light intensity values that computer 10 obtains are controlled according to step 5), substitutes into formulaIt can be obtained by the occurrence of phase-delay quantity δ；
Wherein: n=0, ± 1, ± 2 ... ..., IoutFor system output intensity, ξ is the transmission of liquid crystal variable retarder
Rate, the transmissivity of acousto-optic tunable filter, the product of the transmissivity of devating prism and incident intensity；
7) step 4), step 5) and step 6) are repeated, obtains the multiple groups parameter value of voltage, wavelength and phase-delay quantity δ；
8) divide according to obtained phase-delay quantity δ value, the relation curve of fitting wavelength, voltage and phase-delay quantity.
As δ=- π, the available maximum value I of diffracted light intensitymax=ξ.As long as measuring output maximum value Imax, pass through tune
Humorous output intensity, so that it may calculate phase-delay quantity δ.For example, when the phase delay of LCVR is δ=pi/2, then I=Imax/
2, maximum output light intensity I is obtained by tune drive voltagemax, found again by phase-delay quantity δ when output intensity is Imax/2
When corresponding driving voltage.In actual use, if expecting any one phase-delay quantity under any wavelength,
It only needs to input desired wavelength value and driving voltage value in control computer and can be obtained by desired specific phase delay
Value.
Stokes vector can not only be used to describe complete polarized light, but also can be used to description section polarised light, even
Natural light.Stokes vector is often used in imaging polarization detection application.The Stokes vector S of system output light waveoutDeng
In the Stokes vector S of system input light waveinWith the product of the Muller matrix M of system, Sout=Sin×M。
System always exports the Stokes vector S of light waveoutIt can indicate are as follows:
Sout=[S '0 S′1 S′2 S′3]T=tAOTF·MAOTF·tLCVR·MLCVR·tp·MP·[S0 S1 S2 S3]T
M in formulaAOTF、MLCVRAnd MpThe respectively Muller matrix of AOTF, LCVR and linear polarizer；tAOTF、tLCVRAnd tp
The respectively transmissivity of AOTF, LCVR and linear polarizer.If incident light is natural light, and light intensity is I0, then:
Sin=[S0 S1 S2 S3]T=I0[1 1 0 0]T
In general, the Muller matrix of LCVR can indicate are as follows:
In above formula, θ1, δ be respectively LCVR fast axle and horizontal direction angle and incident light generate phase-delay quantity.
The Muller matrix model of AOTF diffraction light, which can be regarded as, is an ideal linear polarizer, it may be assumed that
θ in formula2For the angle between the light pass surface and horizontal plane of AOTF.
Because of the fast axle of LCVR and the angle theta of horizontal plane1=45 °, and θ2=0, then the Stocks vector S of output lightout
It can indicate are as follows:
Enable ξ=tAOTF×tLCVR×tp×I0, the first component of Stokes vector represents light intensity, therefore diffracted light intensity can
With statement are as follows:
Phase-delay quantity can indicate are as follows:
In formula: n=0, ± 1, ± 2 ... ..., IoutFor system output intensity, ξ is the transmission of liquid crystal variable retarder
Rate, the transmissivity of acousto-optic tunable filter, the product of the transmissivity of devating prism and incident intensity.
It should be noted that has been described above is only a preferred embodiment of the present invention, for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection scope.
Claims (6)
1. a kind of parameter calibration system of liquid crystal variable retarder, it is characterised in that: including light source (1) and along optical path according to
Devating prism (4), liquid crystal variable retarder (5), acousto-optic tunable filter (7), the spectrometer (9) of secondary setting)；
Liquid crystal variable retarder voltage tuning driver (6), acousto-optic are connected on the liquid crystal variable retarder (5)
Radiofrequency launcher (8) are connected on tunable optic filter (7)；The liquid crystal variable retarder voltage tuning driver (6),
Radiofrequency launcher (8), spectrometer (9) are connected with control computer (10) respectively；
Incident beam successively enters acousto-optic tunable filter after devating prism (4) and liquid crystal variable retarder (5)
(7), by control computer (10) control radio driver (8) generate high-frequency ultrasonic, the high-frequency ultrasonic with enter acousto-optic
Acoustic optic interaction occurs for the light beam of tunable optic filter (7), and light beam is divided into diffraction light and 0 grade of transmitted light, the diffraction light quilt
Spectrometer (9) receives, and 0 grade of transmitted light is arranged on the baffle (11) between acousto-optic tunable filter (7) and spectrometer (9) and cuts
Only.
2. the parameter calibration system of liquid crystal variable retarder according to claim 1, it is characterised in that: the light source
(1) optical path between devating prism (4) is equipped with liquid crystal collimation unit (3).
3. the parameter calibration system of liquid crystal variable retarder according to claim 1 or 2, it is characterised in that: described
It is connected on light source (1) light source intensity control device (2), the light source intensity control device (2) is connected with computer (10).
4. a kind of parameter calibration method of liquid crystal variable retarder, it is characterised in that: the following steps are included:
1) open light source (1), make the polarization direction of incident beam along horizontal direction in the acousto-optic tunable filter (7) with it is super
Acoustic optic interaction occurs for sound wave, liquid crystal variable retarder (5) is removed from optical path, and rotatory polarization prism (4), until
The diffraction intensity that acousto-optic tunable filter (7) is received on spectrometer (9) is zero, the devating prism that stops operating (4), at this time from
The polarization light polarization direction of devating prism (4) outgoing is just perpendicular to horizontal plane；
2) liquid crystal variable retarder (5) is replaced between devating prism (4) and acousto-optic tunable filter (7), and
It rotates liquid crystal variable retarder (5), the diffraction intensity until receiving acousto-optic tunable filter (7) on spectrometer (9)
It stops rotating when being reduced to zero again, the fast axle of liquid crystal variable retarder (5) is along horizontal or vertical direction at this time；
3) clockwise or counterclockwise 45 ° again by liquid crystal variable retarder (5), liquid crystal variable retarder at this time
(5) fast axle and be both horizontally and vertically all in 45 °；
4) radio driver (8) being attached on acousto-optic tunable filter (7) is tuned, in the control connecting with spectrometer (9)
Desired diffraction optical wavelength output valve is read on computer (10)；
5) liquid crystal variable retarder voltage tuning driver (6) are tuned, reads corresponding system from control computer (10)
System output light intensity values, by formulaCalculate the value of phase-delay quantity δ；
Wherein: n=0, ± 1, ± 2 ... ..., IoutFor system output intensity, ξ is the transmissivity of liquid crystal variable retarder, sound
The product of the transmissivity of optic tunable filter, the transmissivity of devating prism and incident intensity；
6) step 4) is repeated in 5), obtains the multiple groups parameter value of voltage, wavelength and phase-delay quantity δ；
7) according to obtained phase-delay quantity δ value, the relation curve of fitting wavelength, voltage and phase-delay quantity.
5. the parameter calibration method of liquid crystal variable retarder according to claim 4, it is characterised in that: step 1)
In, the incident beam is collimated before entering devating prism (4) using liquid crystal collimation unit (3).
6. the parameter calibration method of liquid crystal variable retarder according to claim 4 or 5, it is characterised in that: step
1) in, the exiting light beam intensity of light source (1) is adjusted by light source intensity control device (2).
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| CN115407535A (en) * | 2022-07-31 | 2022-11-29 | 陕西师范大学 | Device and method for calibrating liquid crystal variable retarder |
| CN115508281A (en) * | 2022-10-17 | 2022-12-23 | 汕头大学 | Two-channel high-transmittance pure liquid crystal spectral polarization imaging system based on PBS (polarizing beam splitter) and measurement method |
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| CN115407535A (en) * | 2022-07-31 | 2022-11-29 | 陕西师范大学 | Device and method for calibrating liquid crystal variable retarder |
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Application publication date: 20190115 |