CN108007574A - The fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type and method - Google Patents
The fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type and method Download PDFInfo
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Abstract
The invention discloses a kind of fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type, mainly solves the problems, such as that the prior art is limited by temporal resolution and directional bearing angle and luminous flux is low.It includes pre-objective group, microlens array, collimation microscope group, polarization module, dispersion compensation module, imaging microscope group and ccd detector, these components and is put successively along key light direction of principal axis.The premenstrual glove microscope group of incident light is imaged at microlens array, it is changed into directional light by collimating microscope group after image sampling, polarization spectrum modulation is carried out by polarization module, emergent light is after dispersion compensation module and imaging microscope group, one frame of ccd detector snapshot obtains target polarization spectral modulation image, using Fourier transformation and frequency domain filtering mode, realize that the real time integrated of target image, spectrum and linear polarization information obtains.The present invention can realize the multi-gear adjustment of target optical spectrum and spatial resolution detection, beneficial to optimal detection state and capacity usage ratio height is reached, available for the real-time monitoring to target.
Description
Technical field
The invention belongs to imaging detection technology field, more particularly to a kind of image spectrum linear polarization visits technology, can be used for
Target image, spectrum, the real time integrated of linear polarization information obtain.
Background technology
A kind of just electromagnetic wave, strength information, spectral information and polarization information are all the fundamental characteristics of light.Any target exists
Their characteristics of itself can be all shown during reflection and radiated electromagnetic wave.With the fast development of optical technology, meet the tendency of
And life is various types of optical information acquiring technologies, such as shape characteristic of the imaging technique for describing target, spectral technique
The operative condition of material and different wavelengths of light is featured, polarization technology describes scattering and the reflection characteristic of material.Imaging spectral is inclined
Technology of shaking ISP can obtain the two-dimensional space information of target, spatial points at the same time as a kind of new optical detection method
Spectral information, and the polarization information of each spectrum segment, target information is obtained and has been extended to the four-dimension, is target identification and detection
More comprehensive, the accurate, means of science are provided, it is generally investigated, certainly in military investigation, Atmospheric Survey, space remote sensing, earth resource
The numerous areas such as right hazard forecasting, medical diagnosis, agricultural and ocean remote sensing are all by with important application value and prospect.Together
When, since circular component present in nature is seldom, obtain target whole linear polarization information can meet it is most
Using.
Imaging spectral polarization technology is as a kind of remote sensing in forward position, with its abundant function and unique detection
Advantage causes domestic and international extensive concern.Carry out the army that the mechanism that ISP is studied is concentrated mainly on the U.S., Japan, European Union etc. in the world
Side, scientific research institution and colleges and universities, research emphasis mainly include Principle Exploration, experimental verification and application assessment etc..Yet with the skill
Art involves a wide range of knowledge, strongly professional, therefore its technological means is not yet ripe.According to the image, spectrum and polarization of two-dimensional space target
The acquisition modes of information, ISP can be divided into two major class of push-broom type and fast illuminated.At present, most of ISP is still used and pushed away
Formula is swept, forming core element according to it can be divided into：Based on acousto-optic tunable filter AOTF, liquid crystal tunable optical filter LCTF
And the ISP developed in recent years based on passage polarized spectrum technology CSP.
AOTF is similar to LCTF functions, there is electric tuning in service band arbitrarily to pass through the ability of wavelength, while also have
The characteristics of linear polarizer.ISP generally uses by this two classes device for core obtain two bit space numbers of face battle array in a manner of staring
According to, spectral information is obtained by way of sequential is pushed away and swept, and polarization information obtains and usually requires 4 continuous independent measurements, because
This its time resolution limitations, for spectrum and the fast-changing target measurement less effective of polarization information, and due to its spectrum
Section tuning limits the luminous flux of system, and air and the unstable of surrounding environment can cause its acquisition data SNR to be limited, shadow
Ring acquisition of information precision.
The passage polarized spectrum technology of the propositions such as Japanese scholars Kazuhiko Oka in 1999 can be obtained by single measurement
The full polarization state information of detection target is taken, there is real-time detection ability.Its Polarization Modulation module is independent and forms simple, Ke Yizhi
Connect and traditional imaging spectrometer combination realizes that multidimensional optical information obtains.The technology obtains the extensive of domestic and foreign scholars once proposition
Concern, successively proposes channel-style slit dispersion ISP, and channel-style interference the pushing away for multiple types such as Formulas I SP, channel-style optical fiber ISP is swept
Formulas I SP, it is pushed away by one dimensional linear array sweeps or two-dimensional array window sweeps the structure for realizing the four-dimensional super data cube of target.However, by
The polarization spectrum distribution of two-dimensional space target has time and angular effect in the remote sensing of outfield, and one dimensional linear array pushes away total number evidence
The essence of acquisition is that the one-dimensional space polarization spectrum information that will be obtained at different moments carries out splicing, on the one hand its time resolution
Rate is limited, and on the other hand the environmental factor of each one-dimensional polarization spectrum unit experience is also not quite similar, this is to its two-dimentional target field
The inverting of scape multidimensional optical information generates many restrictions.The signal-to-noise ratio that two-dimensional array window sweeps acquisition initial data compares one dimensional linear array
Push away and clear off flux and be increased dramatically, yet with the sequence image obtained in one scan period ground member of the same name it is complete
Grey value profile is all not quite similar in the diverse location of each two field picture, i.e., corresponding directional bearing angle and acquisition time, can cause
The nonuniformity problem of polarization spectrum is restored, and caused by its producing cause is not single instrument modulation in itself,
It can not be still completely eliminated by the calibration of later stage instrument calibration.
In conclusion traditional push-broom type ISP is although with higher spatially and spectrally resolution ratio, Instrument Design and data
Treatment technology also tends to maturation, but since its data acquisition is limited be subject to temporal resolution and attitude, it is practical
It is worth limited.In comparison, snapshot Formulas I SP is with can obtaining target first in special time and particular probe side by single exposure
The polarization spectrum information of parallactic angle, avoids sequence scanning or space pushes away many uncertain factors swept and brought, to realize target figure
Picture, spectrum and the real-time of polarization information, integrated high-accuracy, which obtain, provides brand-new technological means.Study in the world at present
Snapshot Formulas I SP be mainly the snapshot Formulas I SP based on calculating computed tomography, its by the low dimension projective of high dimensional data realize object space and
The acquisition of frequency domain information, but low the shortcomings that causing systemic resolution to be limited is sampled since there are data for projection, and subsequently polarize
Spectrum recovering algorithm is complicated, time-consuming, it is difficult to which input is commercially produced.Based on aperture segmentation or polarize the fast of focal plane array column split
Illuminated ISP causes acquisition data SNR very limited, limits its application range since system light throughput is relatively low.
The content of the invention
The shortcomings that it is an object of the invention to for above-mentioned push-broom type imaging spectral polarization technology, there is provided a kind of resolution ratio can
The fast illuminated image spectrum linear polarization detection device of tune type and method, with overcome sequence scanning or space push away sweep bring it is many not true
Determine factor, improve system light throughput, expand application range.
The purpose of the present invention is what is be achieved through the following technical solutions：
1. a kind of fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type, including：Pre-objective group, lenticule
Array, collimation microscope group, polarization module, dispersion compensation module, imaging microscope group and ccd detector, these components edge in xyz coordinate systems enter
Put successively in the primary optical axis z directions for penetrating light, it is characterised in that：
The microlens array, it is located in the image planes of pre-objective group, and is fixed on single shaft turntable, with around primary optical axis
Z is rotated freely；
The collimation microscope group, its object space focal plane are overlapped with the image space focal plane of microlens array, for carrying out focal length tune
Section and beam collimation；
The polarization module, it includes achromatismWave plate, order phase delayer and polarizer；AchromatismWave plate
Fast axis direction and the angle of x-axis forward direction are 0 °, and the fast axis direction of order phase delayer and the angle of x-axis forward direction are 45 °, polarization
The angle of shake thoroughly direction and the x-axis forward direction of device is 0 °；
The imaging microscope group, its image space focal plane are overlapped with ccd detector sensitive chip position.
2. a kind of fast illuminated image spectrum linear polarization detection method of resolution ratio adjustable type, it is characterised in that including following step
Suddenly：
1) focal length of adjustment collimation microscope group and imaging microscope group, control microlens array are rotated around primary optical axis z, to adjust detection
The spectral resolution and spatial resolution of target, make system be optimal acquisition mode；
2) two-dimensional image information of target is obtained：
The premenstrual glove microscope group of incident light that target is sent is imaged at microlens array, in the back focal plane of microlens array
The upper pupil image for forming each sub-lens unit；Pupil image by polarization module by after collimating and being changed into directional light after microscope group, being carried out
The light of different wave length is gathered the different positions of ccd detector by spectral modulation, emergent light after dispersion compensation module and imaging microscope group
Put；
One frame of ccd detector snapshot obtains the target polarization spectral modulation image of microlens array sampling, obtains target
Two-dimensional image information.
3) data processing is carried out to the single frames polarization spectrum modulation image of ccd detector collection, will each sub-image unit
Intensity arrangement is carried out by dispersion direction, obtains the modulating polarization spectrum of each sub-image unit under wavelength sampling, then to modulating polarization
Spectrum carries out wave number conversion, the wave number sampling spectrum after being converted；
4) inverse Fourier transform is carried out to wave number sampling spectrum, obtains the channelizing frequency spectrum of modulated spectrum；
5) apodization is filtered to channelizing frequency spectrum using window function, intercepts out each channel frequency spectrum, then carry out Fourier's change
Change, obtain each subgraph spectrum and linear polarization information.
The present invention has the following advantages that compared with prior art：
1. the present invention is due to using achromatismWave plate, order phase delayer and polarizer composition polarization module, are used
Penetrate and incident ray polarized component is included in the intensity spectrum of light, can realize the real-time of target image, spectrum and linear polarization information
Integration obtains；
2. the present invention obtains data by ccd detector single exposure, without push away sweeping to target, avoid incident narrow
Energy loss caused by seam or aperture segmentation, ensure that instrument has higher luminous flux and data SNR；
3. the present invention obtains data using fast illuminated principle, target the directional bearing angle of member fix, temporal resolution is high,
It effectively prevent the inversion error brought by environmental change or target itself polarization spectrum information change；
, can be with 4. the present invention is due to using zoom collimation microscope group and varifocal imaging microscope group, coordinating the rotation of microlens array
Realize the multi-gear adjustment of target optical spectrum and spatial resolution detection, reach optimal detection state beneficial to system；
5. the present invention is by single frames dispersion image acquisition target image, spectrum, linear polarization information, without carrying out multiple image
Registration, flow chart of data processing is succinct, it is possible to achieve the real-time monitoring of target.
Brief description of the drawings
Fig. 1 is the overall structure diagram of apparatus of the present invention；
Fig. 2 is the achromatism in apparatus of the present inventionThe structure diagram of wave plate；
Fig. 3 is the structure diagram of the order phase delayer in apparatus of the present invention；
Fig. 4 is the structure diagram of polarizer in apparatus of the present invention；
Fig. 5 realizes flow chart for detection method of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The present invention is set under xyz space coordinates, and wherein the primary optical axis of incident light is z-axis, and xyz coordinate systems meet right
Hand rule.
Referring to Fig. 1, the fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type proposed by the present invention, including：Before
Glove microscope group 1, microlens array 2, collimation microscope group 3, polarization module 4, dispersion compensation module 5, imaging microscope group 6, ccd detector 7；Wherein
Polarization module includes：Achromatism43 three parts of wave plate 41, order phase delayer 42 and polarizer；These components are sat in xyz
Put successively along primary optical axis z directions in mark system.Wherein described microlens array 2 by dense arrangement high molecular polymerization sub-lens list
First coining is formed in substrate of glass, and each sub-lens unit uses hexagon or rectangular configuration, and is fixed on single shaft turntable, can
To be rotated freely around primary optical axis z；The dispersion compensation module 5 uses right angle dispersing prism or Amici dispersing prisms or grating；It is described
Ccd detector 7 is fixed on stepping translation stage or micron positioning table, can be moved forward and backward along primary optical axis z.
The premenstrual glove microscope group 1 of incident light that target is sent is imaged at microlens array 2, in rear Jiao of microlens array 2
The pupil image of each sub-lens unit is formed in plane, its effect is sampled equivalent to target image, and pupil image is by collimating microscope group 3
After being changed into directional light, pass sequentially through by achromatismThe polarization mode that wave plate 41, order phase delayer 42 and polarizer 43 form
Block carries out polarization spectrum modulation, and for emergent light after dispersion compensation module 5 and imaging microscope group 6, the light of different wave length converges in CCD spies
The diverse location of 7 sensitive chip of device is surveyed, 7 sensitive chip of ccd detector is in the image space focal plane of imaging microscope group 6, CCD detection
7 snapshot of device, one frame obtain through microlens array 2 sample target polarization spectral modulation image, by adjusting collimation microscope group 3 and into
As 6 focal length of microscope group, coordinate the rotation of microlens array 2, the spectral resolution and spatial resolution of detection target can be adjusted, reached
To system optimal acquisition mode.
Referring to Fig. 2, the achromatismWave plate 41 is formed using Quartz Crystal Wave Plates with magnesium fluoride wave plate gluing, its fast axle
Direction and the angle of x-axis forward direction are 0 °；
Referring to Fig. 3, the order phase delayer 42 uses high-order wave plate or liquid crystal variable retarder, its fast axle side
It it is 45 ° to the angle with x-axis forward direction；
Referring to Fig. 4, the polarizer 43 uses dichroic film polarizer or wire grating polarizer or Glan-
Taylor ahrens prisms, the angle of its shake thoroughly direction and x-axis forward direction is 0 °；
Referring to Fig. 5, based on apparatus above, the fast illuminated image spectrum linear polarization detection of resolution ratio adjustable type of the present invention
Method, comprises the following steps：
Step 1, the focal length of adjustment collimation microscope group and imaging microscope group, control microlens array are rotated around primary optical axis z, to adjust
The spectral resolution and spatial resolution of target are detected, system is optimal acquisition mode.
Step 2, the two-dimensional image information and subgraph modulating polarization spectrum of target are obtained.
2.1) according to polarization optics principle, the Stokes vector Ss (x, y, λ) that spatial point (x, y) is sent to light beam are expressed as：
Wherein S0For light beam gross energy, S1For the difference of 0 ° of direction linearly polarized light and 90 ° of direction line intensity of polarization light, S2For 45 °
The difference of direction linearly polarized light and 135 ° of direction line intensity of polarization light, S3For right-circularly polarized light and Left-hand circular polarization luminous intensity it
Difference, (x, y) are the space coordinate of target, and λ is detection target wavelength；
2.2) by be 0 ° by the angle of fast axis direction and x-axis forward direction achromatismWave plate, fast axis direction and x-axis are positive
Angle forms polarization module by the polarizer that 45 ° of order phase delayer and the angle of shake thoroughly direction and x-axis forward direction are 0 °
Muller Mueller matrixes MAll(λ) is expressed as：
Wherein, MP(λ) be polarizer Mueller matrixes, MR(λ) be order phase delayer Mueller matrixes, Mλ/4
(λ) is achromatismThe Mueller matrixes of wave plate,For the retardation of order phase delayer；
2.3) the premenstrual glove microscope group of incident light sent target is imaged at microlens array, after microlens array
The pupil image of each sub-lens unit is formed on focal plane；Pupil image is by the way that after collimating and being changed into directional light after microscope group, directional light passes through
The polarization state of emergent light is by Stokes vector representations after polarization module progress polarization spectrum modulation：
Wherein, S0' it is outgoing beam gross energy, S1' it is 0 ° of direction linearly polarized light of emergent light and 90 ° of direction line polarized light intensities
The difference of degree, S2' for the difference of 45 ° of direction linearly polarized lights of emergent light and 135 ° of direction line intensity of polarization light, S3' justify for emergent light dextrorotation
The difference of polarised light and Left-hand circular polarization luminous intensity,Light Stokes vectors after being modulated for polarization spectrum, due to ccd detector only
There is response to total light intensity, and it is insensitive to the polarization state of light, therefore emergent light total light intensity I (λ) is：
Emergent light converges to the light of different wave length up in CCD spies by being imaged microscope group after dispersion compensation module is divided
The diverse location of device is surveyed, one frame of ccd detector snapshot obtains the polarization spectrum modulation image of microlens array sampling, i.e. target two
Tie up image information and subgraph modulating polarization spectrum.
Step 3：Obtain the modulating polarization spectrum of subgraph wave number sampling.
3.1) sub-image unit of above-mentioned single frames polarization spectrum modulation image is subjected to intensity arrangement by dispersion direction, obtained
The modulating polarization spectrum of the lower sub-image unit of wavelength sampling；
3.2) conversion of wave number sampling is carried out to wavelength sample modulation polarization spectrum using following formula, obtains wave number sample modulation
Polarization spectrum I (σ)：
I (σ)=σ2Interp{I(λ)} <5>
In formula, σ2For the change of scale factor, energy coincidence before and after being changed for guarantee；Interp { } represents that batten is inserted
Value.
Step 4：The channelizing frequency spectrum of modulating polarization spectrum is obtained according to modulating polarization spectrum I (σ).
According to Fourier transform spectroscopy, inverse Fourier transform is carried out to the modulating polarization spectrum of wave number sampling, is led to
Road frequency spectrum F (δ)：
In formula,Represent inverse Fourier transform, S0(σ) is the target incident light beam gross energy that includes in I (σ), S1(σ)
For the 0 ° of direction linearly polarized light of target incident light and the difference of 90 ° of direction line intensity of polarization light included in I (σ), S2(σ) is in I (σ)
Comprising the sampling of target incident light wave number 45 ° of direction linearly polarized lights of modulating polarization spectrum and 135 ° of direction line intensity of polarization light it
Difference,The retardation of order phase delayer, C are sampled for wave number0(δ) is to include S0The channelizing frequency spectrum of (σ) component, C1(δ)
It is to include S1(σ) and S2The positive frequency channelizing frequency spectrum of (σ) component, C-1(δ) is to include S1(σ) and S2The negative frequency channelizing of (σ) component
Frequency spectrum, they are separated from each other in optical path difference domain F (δ).
Step 5：Apodization and Fourier transformation are filtered to channelizing frequency spectrum, obtains target optical spectrum and linear polarization information.
5.1) apodization is filtered to channelizing frequency spectrum using filtering apodizing function, intercepts out intensity channel frequency spectrum C respectively0
(δ), positive frequency linear polarization channel frequency spectrum C1(δ) and negative frequency linear polarization channel frequency spectrum C-1(δ), filtering apodizing function is using selection triangle
Window function or hamming window function or Hanning window function, this example use but are not limited to triangle window function；
5.2) the intensity channel frequency spectrum C intercepted out is chosen0(δ), and positive frequency linear polarization channel frequency spectrum C1(δ) and negative frequency line
Channel of polarization frequency spectrum C-1Any channel frequency spectrum in (δ), intensity channel frequency spectrum C is chosen in this example0(δ) and positive frequency linear polarization are led to
Road frequency spectrum C1(δ), carries out Fourier transformation using following formula, obtains the spectral information and linear polarization information of target incident light：
In formula, S0(σ) is the target incident light beam gross energy included in I (σ), i.e. intensity spectrum；S1(σ) is bag in I (σ)
The difference of 0 ° of direction linearly polarized light of the target incident light contained and 90 ° of direction line intensity of polarization light；S2(σ) is the target included in I (σ)
45 ° of direction linearly polarized lights of modulating polarization spectrum of incident light wave number sampling and the difference of 135 ° of direction line intensity of polarization light；Table
Show Fourier transformation, for real () to take real part, imag () is to take imaginary part.
Above description is only example of the present invention, does not form any limitation of the invention, it is clear that for
, all may be without departing substantially from the principle of the invention, structure after present invention and principle has been understood for one of skill in the art
In the case of, progress form and the various modifications in details and change, but these modifications and variations based on inventive concept
Still in the claims of the present invention.
Claims (10)
1. a kind of fast illuminated imaging spectral linear polarization detection device of resolution ratio adjustable type, including pre-objective group (1), lenticule battle array
Arrange (2), collimation microscope group (3), polarization module (4), dispersion compensation module (5), imaging microscope group (6) and ccd detector (7), these components
Put successively along the primary optical axis z directions of incident ray in xyz coordinate systems, it is characterised in that：
The microlens array (2), it is located in the image planes of pre-objective group (1), and is fixed on single shaft turntable, with around key light
Axis z is rotated freely；
The collimation microscope group (3), its object space focal plane is overlapped with the image space focal plane of microlens array (2), for carrying out focal length
Adjusting and beam collimation；
The polarization module (4), it includes achromatismWave plate (41), order phase delayer (42) and polarizer (43)；Colour killing
DifferenceThe fast axis direction of wave plate (41) and the angle of x-axis forward direction are 0 °, and the fast axis direction and x-axis of order phase delayer (42) are just
To angle be 45 °, the angle of shake thoroughly direction and the x-axis forward direction of polarizer (43) is 0 °；
The imaging microscope group (6), its image space focal plane are overlapped with ccd detector (7) sensitive chip position.
2. device according to claim 1, it is characterised in that：The microlens array (2) by dense arrangement macromolecule
Material lenticular unit coining is formed in substrate of glass, and each sub-lens unit uses hexagon or rectangular configuration.
3. device according to claim 1, it is characterised in that：
The achromatismWave plate (41) is formed using Quartz Crystal Wave Plates with magnesium fluoride wave plate gluing；
The order phase delayer (42) uses high-order wave plate or liquid crystal variable retarder；
The polarizer (43) uses dichroic film polarizer or wire grating polarizer or Glan-Taylor polarisation ribs
Mirror.
4. device according to claim 1, it is characterised in that：The dispersion compensation module (5) using right angle dispersing prism or
Amici dispersing prisms or grating.
5. device according to claim 1, it is characterised in that：The ccd detector (7) is fixed on stepping translation stage or micro-
On rice positioning table, moved forward and backward along primary optical axis z.
6. a kind of fast illuminated imaging spectral linear polarization detection method of resolution ratio adjustable type, it is characterised in that include the following steps：
1) focal length of adjustment collimation microscope group and imaging microscope group, control microlens array is rotated around primary optical axis z, to adjust detection target
Spectral resolution and spatial resolution, system is optimal acquisition mode；
2) two-dimensional image information and subgraph modulating polarization spectrum of target are obtained：
The premenstrual glove microscope group of incident light that target is sent is imaged at microlens array, the shape on the back focal plane of microlens array
Into the pupil image of each sub-lens unit；Pupil image is by the way that after collimating and being changed into directional light after microscope group, spectrum is carried out by polarization module
The light of different wave length is gathered the diverse location of ccd detector by modulation, emergent light after dispersion compensation module and imaging microscope group；
One frame of ccd detector snapshot obtains the target polarization spectral modulation image of microlens array sampling, obtains the two dimension of target
Image information.
3) to ccd detector collection single frames polarization spectrum modulation image carry out data processing, will each sub-image unit press color
Dissipate direction and carry out intensity arrangement, obtain the modulating polarization spectrum of each sub-image unit under wavelength sampling, then to modulating polarization spectrum
Wave number conversion is carried out, the wave number sampling spectrum after being converted；
4) inverse Fourier transform is carried out to wave number sampling spectrum, obtains the channelizing frequency spectrum of modulated spectrum；
5) apodization is filtered to channelizing frequency spectrum using window function, intercepts out each channel frequency spectrum, then carry out Fourier transformation, obtained
Obtain each subgraph spectrum and linear polarization information.
7. according to the method described in claim 6, it is characterized in that, in step 3) to modulation polarization spectrum carry out wave number conversion,
It is to be carried out using following formula：
I (σ)=σ2Interp{I(λ)}
In formula, I (λ) is wavelength sample modulation polarization spectrum, and I (σ) is wave number sample modulation polarization spectrum after conversion, σ2For scale
Transformation factor, for ensureing the uniformity of energy before and after changing；
Interp { } represents spline interpolation.
8. according to the method described in claim 6, it is characterized in that, Fourier's inversion is carried out to wave number sampling spectrum in step 4)
Change, carried out by following formula：
In formula, F (δ) is the channelizing frequency spectrum that obtains after inverse Fourier transform, S0(σ) is light beam gross energy, i.e. intensity spectrum, S1
(σ) is the difference of 0 ° of direction linearly polarized light and 90 ° of direction line intensity of polarization light, S2(σ) is 45 ° of direction linearly polarized lights and 135 ° of directions
The difference of linearly polarized light intensity；Represent Fourier transformation,The phase-delay quantity of order phase delayer is sampled for wave number,
C0(δ) is to include S0The channelizing frequency spectrum of (σ) component, C1(δ) is to include S1(σ) and S2The positive frequency channelizing frequency spectrum of (σ) component,
C-1(δ) is to include S1(σ) and S2The negative frequency channelizing frequency spectrum of (σ) component.
9. according to the method described in claim 6, it is characterized in that, the window function of step 5), is to use quarter window or hamming window
Or Hanning window.
10. according to the method described in claim 6, it is characterized in that, the middle progress Fourier transformation of step 5), obtains each subgraph
Spectrum and linear polarization information, are by three components of following formula calculating incident light Stokes parameters, i.e. S0(σ) component, S1(σ) point
Amount and S3(σ) component carries out：
In formula, S0(σ) is light beam gross energy, i.e. intensity spectrum, S1(σ) is 0 ° of direction linearly polarized light and 90 ° of direction line polarized light intensities
The difference of degree, S2(σ) is the difference of 45 ° of direction linearly polarized lights and 135 ° of direction line intensity of polarization light；High-order phase is sampled for wave number
The phase-delay quantity of position delayer, C0(δ) is to include S0The channelizing frequency spectrum of (σ) component, C1(δ) is to include S1(σ) and S2(σ) point
The channelizing frequency spectrum of amount；Represent Fourier transformation, for real () to take real part, imag () is to take imaginary part.
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