CN108007574B - 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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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
Abstract
The invention discloses a kind of fast illuminated image spectrum linear polarization detection devices of resolution ratio adjustable type, mainly solve the problems, such as that the prior art is limited by temporal resolution and directional bearing angle and luminous flux is low.It includes that pre-objective group, microlens array, collimation microscope group, polarization module, dispersion compensation module, imaging microscope group and ccd detector, these components are successively put along key light axis direction.The premenstrual glove microscope group of incident light images at microlens array, become 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, in the way of Fourier transformation and frequency domain filtering, realize that the real time integrated of target image, spectrum and linear polarization information obtains.The present invention is able to achieve the multi-gear adjustment of target optical spectrum and spatial resolution detection, conducive to optimal detection state and capacity usage ratio height is reached, can be used for the real-time monitoring to target.
Description
Technical field
The invention belongs to imaging detection technology field, in particular to a kind of image spectrum linear polarization visits technology, can be used for
The real time integrated acquisition of target image, spectrum, linear polarization information.
Background technique
Light is a kind of electromagnetic wave, and strength information, spectral information and polarization information are all the fundamental characteristics of light.Any target exists
They itself characteristic 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, as imaging technique is used to describe the shape characteristic of target, spectral technique
The operative condition of substance and different wavelengths of light is featured, polarization technology describes the scattering and reflection characteristic of substance.Imaging spectral is inclined
Vibration technology ISP can obtain the two-dimensional space information of target, spatial points as a kind of novel optical detection method simultaneously
Target information acquisition has been extended to the four-dimension, has been target identification and detection by spectral information and the polarization information of each spectrum segment
More comprehensive, accurate, science means are provided, are 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 all will be with important application value and prospect.Together
When, the circular component as present in nature is seldom, and the linear polarization information for obtaining target whole can meet mostly
Using.
Remote sensing of the imaging spectral polarization technology as a kind of forward position, with its function abundant and unique detection
Advantage causes domestic and international extensive concern.The mechanism that ISP research is carried out in the world is concentrated mainly on the army of the U.S., Japan, European Union etc.
Side, scientific research institution and colleges and universities, research emphasis mainly include Principle Exploration, experimental verification and application assessment etc..However due to the skill
Art involves a wide range of knowledge, strongly professional, therefore its technological means is not yet mature.According to the image, spectrum and polarization of two-dimensional space target
The acquisition modes of information, ISP can be divided into push-broom type and fast illuminated two major classes.It is pushed away currently, most of ISP is still used
Formula is swept, constituting 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 channel polarized spectrum technology CSP.
AOTF is similar to LCTF function, there is electric tuning in service band arbitrarily to penetrate the ability of wavelength, while also having
The characteristics of linear polarizer.Two bit space numbers of face battle array are obtained in such a way that these two types of devices are generallyd use as the ISP of core and to be stared
According to, spectral information is obtained in such a way that timing 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, which tunes, limits the luminous flux of system, and unstable its acquisition data SNR that will cause of atmosphere and ambient enviroment is limited, shadow
Ring acquisition of information precision.
The channel 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 constitutes simple, Ke Yizhi
It connects 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 interferes Formulas I SP, and the pushing away for multiple types such as channel-style optical fiber ISP is swept
Formulas I SP, pushed away by one dimensional linear array sweep or two-dimensional array window sweep realize the super data cube of the target four-dimension building.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 for obtaining 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 produces many restrictions.Two-dimensional array window sweeps the signal-to-noise ratio for obtaining initial data compared to one dimensional linear array
Push away and clear off flux and be increased dramatically, however in the sequence image due to being obtained in one scan period ground member of the same name it is complete
Grey value profile is all not quite similar, will lead in the different location of each frame image, i.e., corresponding directional bearing angle and acquisition time
Restore the nonuniformity problem of polarization spectrum, and since its producing cause is not caused by single instrument modulation itself,
It still cannot be completely eliminated by the calibration of later period instrument calibration.
In conclusion traditional push-broom type ISP is although spatially and spectrally resolution ratio with higher, Instrument Design and data
Processing technique also tends to be mature, but since its data acquisition is limited by temporal resolution and attitude, practical
It is worth limited.In comparison, snapshot Formulas I SP is with can obtaining target first in specific time and particular probe side by single exposure
The polarization spectrum information of parallactic angle, avoids sequence scanning or space pushes away and sweeps many uncertain factors of bring, to realize target figure
Picture, spectrum and the real-time of polarization information, integrated high-accuracy acquisition provide completely new technological means.It studies in the world at present
Snapshot Formulas I SP is mainly the snapshot Formulas I SP based on calculating computed tomography, by the low dimension projective of high dimensional data realize object space and
The acquisition of frequency domain information, but due to have the shortcomings that data for projection sample it is low cause systemic resolution limited, and subsequent polarization
Spectrum recovering algorithm is complicated, time-consuming, it is difficult to which investment 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 scope of application since system light throughput is lower.
Summary of the invention
It is an object of the invention to be directed to above-mentioned push-broom type imaging spectral polarization technology, providing 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 really
Determine factor, improve system light throughput, expands application range.
The purpose of the present invention is achieved through the following technical solutions:
1. a kind of fast illuminated image spectrum linear polarization detection device of resolution ratio adjustable type, comprising: 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 system enter
It successively puts in the direction primary optical axis z for penetrating light, it is characterised in that:
The microlens array is located in the image planes of pre-objective group, and is fixed on uniaxial turntable, around primary optical axis
Z is rotated freely；
The collimation microscope group, 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 comprising 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 saturating vibration direction of device and the angle of x-axis forward direction are 0 °；
The imaging microscope group, 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, which is characterized in that including walking as follows
It is rapid:
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 issues images at microlens array, in the back focal plane of microlens array
The upper pupil image for forming each sub-lens unit；After pupil image is by becoming directional light after collimation microscope group, carried out by polarization module
The light of different wave length is gathered the different positions of ccd detector after dispersion compensation module and imaging microscope group by spectral modulation, emergent light
It sets；
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 acquisition, i.e., by 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, and the wave number after being converted samples spectrum；
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
It changes, obtains each subgraph spectrum and linear polarization information.
The invention has the following advantages over the prior art:
1. the present invention is due to using achromatismWave plate, order phase delayer and polarizer form polarization module, use
It penetrates in the intensity spectrum of light comprising incident ray polarized component, can be realized 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 luminous flux with higher 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 prevents because of environmental change or target itself polarization spectrum information change bring inversion error；
It, can be with 4. the present invention is due to cooperating the rotation of microlens array using zoom collimation microscope group and varifocal imaging microscope group
The multi-gear adjustment for realizing target optical spectrum and spatial resolution detection, reaches optimal detection state conducive to system；
5. the present invention obtains target image, spectrum, linear polarization information by single frames dispersion image, without carrying out multiple image
Registration, flow chart of data processing is succinct, and the real-time monitoring of target may be implemented.
Detailed description of the invention
Fig. 1 is the overall structure diagram of apparatus of the present invention；
Fig. 2 is the achromatism in apparatus of the present inventionThe structural schematic diagram of wave plate；
Fig. 3 is the structural schematic diagram of the order phase delayer in apparatus of the present invention；
Fig. 4 is the structural schematic diagram of polarizer in apparatus of the present invention；
Fig. 5 is the implementation flow chart of detection method of the present invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
The present invention is arranged under xyz space coordinates, and wherein the primary optical axis of incident light is z-axis, and xyz coordinate system meets 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, comprising: preceding
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
It is successively put in mark system along the direction primary optical axis z.Wherein the microlens array 2 by dense arrangement high molecular polymerization sub-lens list
First coining is constituted in substrate of glass, and each sub-lens unit uses hexagon or rectangular configuration, and is fixed on uniaxial turntable, can
To be rotated freely around primary optical axis z；The dispersion compensation module 5 is using right angle dispersing prism or Amici dispersing prism 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 issues images at microlens array 2, in the rear coke of microlens array 2
The pupil image of each sub-lens unit is formed in plane, effect, which is equivalent to, samples target image, and pupil image passes through collimation microscope group 3
After becoming 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 spy
The different location of 7 sensitive chip of device is surveyed, 7 sensitive chip of ccd detector is located in the image space focal plane of imaging microscope group 6, CCD detection
7 snapshot of device, one frame obtains the target polarization spectral modulation image that samples through microlens array 2, by adjusting collimation microscope group 3 and at
As 6 focal length of microscope group, cooperate the rotation of microlens array 2, the spectral resolution and spatial resolution of adjustable detection target reach
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, fast axle
The angle of direction and x-axis forward direction is 0 °；
Referring to Fig. 3, the order phase delayer 42 uses high-order wave plate or liquid crystal variable retarder, fast axle side
It is 45 ° to the angle with x-axis forward direction；
Referring to fig. 4, the polarizer 43 is using dichroic film polarizing film or wire grating polarizing film or Glan-
Taylor ahrens prism, the angle of vibration direction and x-axis forward direction is 0 ° thoroughly；
Referring to Fig. 5, it is based on apparatus above, the fast illuminated image spectrum linear polarization detection of resolution ratio adjustable type of the present invention
Method, comprising 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 for detecting target, make system be 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, spatial point (x, y) Stokes vector S (x, y, λ) for issuing light beam is indicated are as follows:
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, S2It is 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 the angle in 45 ° of order phase delayer and saturating vibration direction and x-axis forward direction is 0 °
Muller Mueller matrix MAll(λ) is indicated are as follows:
Wherein, MP(λ) is the Mueller matrix of polarizer, MR(λ) is the Mueller matrix of order phase delayer, Mλ/4
(λ) is achromatismThe Mueller matrix of wave plate,For the retardation of order phase delayer；
2.3) the premenstrual glove microscope group of incident light that target issues is imaged at microlens array, after microlens array
The pupil image of each sub-lens unit is formed on focal plane；After pupil image is by becoming directional light after collimation microscope group, directional light passes through
The polarization state of emergent light is by Stokes vector representation after polarization module progress polarization spectrum modulation are as follows:
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' be emergent light 45 ° of direction linearly polarized lights and 135 ° of direction line intensity of polarization light difference, S3' it is emergent light dextrorotation circle
The difference of polarised light and Left-hand circular polarization luminous intensity,Light Stokes vector after being modulated for polarization spectrum, only due to ccd detector
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) are as follows:
The light convergence of different wave length is reached by imaging microscope group and is visited in CCD after dispersion compensation module is divided by emergent light
The different 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: obtaining 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
Wavelength samples the modulating polarization spectrum of lower sub-image unit；
3.2) conversion for carrying out wave number sampling 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, front and back energy coincidence is converted for guaranteeing；Interp { } indicates 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,Indicate inverse Fourier transform, S0(σ) is the target incident light beam gross energy for including, S in I (σ)1
(σ) is the difference of the target incident light 0 ° of the direction linearly polarized light and 90 ° of direction line intensity of polarization light that include, S in I (σ)2(σ) is I
The 45 ° of direction linearly polarized lights of modulating polarization spectrum and 135 ° of direction linearly polarized lights for the target incident light wave number sampling for including in (σ)
The difference of intensity,The retardation of order phase delayer, C are sampled for wave number0(δ) is comprising S0The channelizing frequency of (σ) component
Spectrum, C1(δ) is comprising S1(σ) and S2The positive frequency channelizing frequency spectrum of (σ) component, C-1(δ) is comprising S1(σ) and S2(σ) component is born
Frequency channelizing frequency spectrum, they are separated from each other in optical path difference domain F (δ).
Step 5: apodization and Fourier transformation being filtered to channelizing frequency spectrum, obtain 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) chooses intensity channel frequency spectrum C in this example0(δ) and positive frequency linear polarization are logical
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 for including, i.e. intensity spectrum in I (σ)；S1(σ) is packet in I (σ)
The difference of the target incident light 0 ° of the direction linearly polarized light and 90 ° of direction line intensity of polarization light that contain；S2(σ) is the target for including in I (σ)
The difference of modulating polarization spectrum 45 ° of the direction linearly polarized lights and 135 ° of direction line intensity of polarization light of the sampling of incident light wave number；Table
Show Fourier transformation, real () is to take real part, and imag () is to take imaginary part.
Above description is only example of the present invention, does not constitute any limitation of the invention, it is clear that for
It, all may be without departing substantially from the principle of the invention, structure after having understood the content of present invention and principle for one of skill in the art
In the case where, carry out various modifications and change in form and details, but these modifications and variations based on inventive concept
Still within the scope 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
It successively puts in the direction primary optical axis z in xyz coordinate system along incident ray, it is characterised in that:
The microlens array (2) is located in the image planes of pre-objective group (1), and is fixed on uniaxial turntable, around key light
Axis z is rotated freely；
The collimation microscope group (3), 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) comprising 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 saturating vibration direction of polarizer (43) and the angle of x-axis forward direction are 0 °；
The imaging microscope group (6), image space focal plane are overlapped with ccd detector (7) sensitive chip position.
2. the apparatus according to claim 1, it is characterised in that: the microlens array (2) by dense arrangement macromolecule
Material lenticular unit coining is constituted in substrate of glass, and each sub-lens unit uses hexagon or rectangular configuration.
3. the apparatus 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) is using dichroic film polarizing film or wire grating polarizing film or Glan-Taylor polarisation rib
Mirror.
4. the apparatus according to claim 1, it is characterised in that: the dispersion compensation module (5) using right angle dispersing prism or
Amici dispersing prism or grating.
5. the apparatus 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, which comprises the steps of:
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, so that 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 issues images at microlens array, the shape on the back focal plane of microlens array
At the pupil image of each sub-lens unit；After pupil image is by becoming directional light after collimation microscope group, spectrum is carried out by polarization module
The light of different wave length is gathered the different location of ccd detector after dispersion compensation module and imaging microscope group by modulation, emergent light；
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) data processing is carried out to the single frames polarization spectrum modulation image of ccd detector acquisition, i.e., each sub-image unit is pressed into color
It dissipates direction and carries out intensity arrangement, obtain the modulating polarization spectrum of each sub-image unit under wavelength sampling, then to modulation polarization spectrum
Wave number conversion is carried out, the wave number after being converted samples spectrum；
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, obtains
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 guaranteeing the consistency of conversion front and back energy；Interp { } indicates spline interpolation.
8. according to the method described in claim 6, it is characterized in that, carrying out Fourier's inversion to wave number sampling spectrum in step 4)
It changes, is 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；Indicate Fourier transformation,The phase delay of order phase delayer is sampled for wave number
Amount, C0(δ) is comprising S0The channelizing frequency spectrum of (σ) component, C1(δ) is comprising S1(σ) and S2The positive frequency channelizing frequency of (σ) component
Spectrum, C-1(δ) is comprising 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 using 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 three components for being calculate by the following formula incident light Stokes parameter, 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 comprising S0The channelizing frequency spectrum of (σ) component, C1(δ) is comprising S1(σ) and S2(σ) point
The channelizing frequency spectrum of amount；Indicate Fourier transformation, real () is to take real part, and imag () is to take imaginary part.
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