CN104931141B - A kind of white light double Sagnac polarization imaging methods of full stokes parameter - Google Patents
A kind of white light double Sagnac polarization imaging methods of full stokes parameter Download PDFInfo
- Publication number
- CN104931141B CN104931141B CN201510377163.6A CN201510377163A CN104931141B CN 104931141 B CN104931141 B CN 104931141B CN 201510377163 A CN201510377163 A CN 201510377163A CN 104931141 B CN104931141 B CN 104931141B
- Authority
- CN
- China
- Prior art keywords
- light
- polarization
- sagnac
- dispersion
- splitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The present invention discloses a kind of double Sagnac polarization imaging methods of white light of full stokes parameter：The light that two-dimensional space target is sent is set to form intermediate image plane by processing, the light that intermediate image plane is sent is by collimation, then beam splitting is reflected light and transmitted light, wherein transmitted light is directly entered in a dispersion sagnac polarization beam-splitting unit, and reflected light is first passed through after the half-wave plate of a De-dispersion in another dispersion gnac polarization beam-splitting units are entered；Then by processing, finally obtain that two beam lateral shears are directly proportional to wavelength and the orthogonal light of direction of vibration；Four bundles light is converged at a bit, by beam splitting, angle plane array is imaged onto by imaging len after polarization, to obtain the interference image of whole stokes parameter Modulation and Amplitude Modulations under white light conditions, finally obtain the two-dimensional space figure of each polarized component.The present invention has potential using value in astronomical observation, earth remote sensing, the field such as machine vision and biomedical diagnostic.
Description
Technical field
The invention belongs to optical remote sensing field of detecting, is related to a kind of polarization imaging for polarized radiation field of detecting and fills
Put, the double Sagnac polarization imagings interferometers of white light and its imaging method of more particularly to a kind of full stokes parameter.
Background technology
Contain important polarization remote sensing information in the electromagnetic wave of object reflection, can be used not only for removing ambient noise, raising pair
Than information such as the surface of degree, pattern, shade and roughness, the physical chemistry such as size, the concentration of inverting target spy can be also used for
Property.Polarization imaging is a kind of while obtains object space and the advanced remote sensing of polarization information, to improving target acquisition, knowing
Other and classification efficiency and precision have certain potentiality, in military surveillance, earth resource generaI investigation, environmental health monitoring and surveilliance, nature
The numerous areas such as hazard forecasting, Atmospheric Survey, astronomical observation, machine vision are freeed, biomedical diagnostic are all by with important
Application value and prospect.Although polarization imaging technology is a new foreword remote sensing, its unique remote sensing is visited
Survey advantage has caused the attention of domestic and international important mechanism.Foreign study mechanism is concentrated mainly on the great of the country such as U.S., day, Europe
Engineering project relies on unit, the military, university etc.；Mainly there are Anhui ray machine institute, Xi'an ray machine institute, Xi'an in studies in China mechanism at present
University of communications etc., the polarized radiation Detection Techniques reported are with their own characteristics.
Polarization imager generally uses 4f imaging arrangements, or plane mirror imaging structure (sagnac structures).Its according into
As technology according to light source can be divided into Active Imaging and imaging and passive imaging technology, Active Imaging using Muller polarization imaging as representative, its
Light source is known or controllable, and the polarization state of target can be detected using detector；Imaging and passive imaging is generally polarized with stokes
As being representative.It can be divided into data reduction pattern, Fourier analysis method, channel modulation pattern according to data processing method.Data
The simplified mode refer to obtain polarization information it is bigger than required polarization state dimension, by institute arrive polarization information progress data
Processing obtains required polarization state；And Fourier analysis method is the light intensity obtained by rotating wave plate on the progressive angle of rotation
Fourier space expression formula, finally obtains stokes parameter by fortran；Channel modulation type is to join different polarization states
Modulation and Amplitude Modulation is counted to different frequencies, so that data are carried out with processing obtains polarization state information.It can be divided again according to the time
For timing polarization imager, with non-sequential polarization imager.Timing be mainly obtained by rotatory polarization piece it is different inclined
Polarization state, so that information required for data processing acquisition is carried out, the drawback is that cannot be imaged to dynamic object；Non-sequential can be drawn again
It is divided into a point amplitude type, divides aperture Xing Fen focal planes type and channel modulation type, divide amplitude type to generally require multiple detectors, data are same
Step is more difficult, and equipment instrument is bigger and more complicated.Point aperture type is that several figures are produced on a detector, resolution ratio compared with
It is low, make difficult；Divide focal plane type main space resolution ratio relatively low；Channel modulation type is that polarization letter is obtained on single image
Breath, such polarization imager can obtain all Stokes polarization parameter information on two-dimensional space in the short time, and
Make the advantages that simple.The invention belongs to channel modulation type snapshot polarization imager.
The content of the invention
It is an object of the invention to provide a kind of polarization that can instantaneously obtain the full stokes parameters of target under white light conditions
Imaging method, it obtains the light beam directly proportional to wavelength using the chromatic dispersion principle and sagnac light channel structures of balzed grating, and shears
Amount, is interfered two-by-two by four beam polarised lights of special distribution, the final interference fringe picture obtained by stokes parameter Modulation and Amplitude Modulations
Picture, interference fringe frequency is inversely proportional with wavelength, directly proportional to shearing displacement, so as to eliminate the influence of wavelength.
The purpose of the present invention is what is be achieved through the following technical solutions：
The double Sagnac polarization imaging methods of white light of this full stokes parameter：Make the light warp that two-dimensional space target is sent
Cross processing and form intermediate image plane, the light that intermediate image plane is sent is by collimation, and then beam splitting is reflected light and transmitted light, wherein transmiting
Light is directly entered in a dispersion sagnac polarization beam-splitting unit, and reflected light is entering after first passing through the half-wave plate of a De-dispersion
In another dispersion gnac polarization beam-splitting units；Light into dispersion sagnac polarization beam-splitting units passes through linear beam splitter, sudden strain of a muscle
Shine grating, plane mirror, plane mirror, then finally obtain through balzed grating, and linear beam splitter two beam lateral shears with
Wavelength is directly proportional and the orthogonal light of direction of vibration；Reflect between branch and transmission branch and adjusted by two groups of plane mirrors
Optical path direction and light path so that four bundles light converges at a bit；Four bundles light passes through beam splitter, again by polarizer polarization direction, then
Angle plane array is imaged onto by imaging len, data acquisition is carried out, to obtain whole stokes parameter amplitudes under white light conditions
The interference image of modulation, finally by Fourier's inverse conversion, filtering and the Fourier transform to interference image, so as to obtain each
The two-dimensional space figure of polarized component.
Further, above-mentioned balzed grating, is the limiting case of transmission-type binary optical elements, and diffraction grating ideal sawtooth is thick
Degree is approximately that centre wavelength and grating material are poor with ambient refractive index, and can be high by diffraction efficiency is obtained first-order diffraction
Light.
Further, acted on above by the light of dispersion sagnac polarization beam-splitting units with lateral shear, shearing displacement and ripple
Length is directly proportional.
The invention has the advantages that：
1st, the present invention can obtain polarization information to the extraterrestrial target under the conditions of polychromatic light, while remain the space of target
Information and colouring information；
2nd, only need to be to a two field picture of two-dimensional space target, you can to obtain the information such as its polarization, temporal resolution is high, keeps away
Exempt from the influence that environmental change is brought, work efficiency is high.
3rd, data processing is simple and quick, and target can be detected in real time.
Brief description of the drawings
Fig. 1 is the double Sagnac polarization imaging interference devices of white light for realizing the full stokes parameter that the present invention invents；
Fig. 2 is single sagnac structures spectrophotometric unit；
Fig. 3 is to be distributed by the four bundles light after spectroscope；
Fig. 4 be interference image Fourier transformation after obtain frequency spectrum profile.
Wherein：100th, preposition optics microscope group, 200, the full Polarization Modulation module of white light, 300, optical path direction modulation microscope group,
400th, polariscope, 500, imaging len, 600, planar array detector, 700, data acquisition processing system, 110, object lens, 120, visual field
Diaphragm, 130, collimation lens；210th, spectroscope, 220, half-wave plate, the 230, first single polychromatic light polarization interference unit, 240,
Two single polychromatic light polarization interference units, 231, wiregrating beam splitter, 232, balzed grating, 233, plane mirror, 2301,2302
The polarised light respectively obtained by single sagnca beam splitting units 230,204,2402 be respectively to pass through the second single polychromatic light
The polarised light that polarization interference unit 240 obtains；310th, 320,330,340, four plane reflections in optical path direction modulation microscope group
Mirror, 350, spectroscope；400 be polariscope；500 be imaging len；600th, focal plane arrays (FPA).
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright scope.
The double Sagnac polarization imaging methods of white light of this full stokes parameter of the present invention are：Make two-dimensional space target
The light sent forms intermediate image plane by processing, and for the light that intermediate image plane is sent by collimation, then beam splitting is reflected light and transmission
Light, wherein transmitted light are directly entered in a dispersion sagnac polarization beam-splitting unit, and reflected light first passes through the half of a De-dispersion
After wave plate in another dispersion sagnac polarization beam-splitting units are entered；Light into dispersion sagnac polarization beam-splitting units passes through
Linear beam splitter 231, balzed grating, 232, plane mirror 233-1, plane mirror 233-2, then through balzed grating, 232 with
Linear beam splitter 231 finally obtains that two beam lateral shears are directly proportional to wavelength and the orthogonal light of direction of vibration；Reflect branch
Optical path direction and light path are adjusted by two groups of plane mirrors so that four bundles light converges at a bit, four beams between transmission branch
Light passes through beam splitter, again by polarizer polarization direction, then is imaged onto angle plane array by imaging len, carries out data and adopts
Collection, to obtain the interference image of whole stokes parameter Modulation and Amplitude Modulations under white light conditions, finally by Fu to interference image
Leaf conversion, filtering and Fourier's inverse conversion, so as to obtain the two-dimensional space figure of each polarized component.Polarized by dispersion sagnac
The light of beam splitting unit is acted on lateral shear, and shearing displacement is directly proportional to wavelength.The balzed grating, 232 is transmission-type binary optical
The limiting case of element is learned, diffraction grating ideal sawtooth thickness is approximately that centre wavelength and grating material are poor with ambient refractive index,
And can be high by diffraction efficiency is obtained first-order diffraction light.
As shown in Figure 1, in order to realize the method for the present invention, the present invention provides a kind of white light of full stokes parameter is double
The embodiment of Sagnac polarization imaging interferometers, the interferometer from incident light to set gradually preposition optics microscope group 100, white light
Full Polarization Modulation module 200, optical path direction modulation microscope group 300, polariscope 400, imaging len 500,600 sum number of planar array detector
Formed according to acquisition processing system 700；
Preposition optics microscope group 100 is by 130 groups of object lens 110, field stop 120, collimation lens being successively set in light path
Into；The full Polarization Modulation module 200 of white light is single multiple by spectroscope 210, the first single polychromatic light polarization interference unit 230, second
Coloured light polarization interference unit 240 and half-wave plate 220 form；The first single polychromatic light polarization interference unit 230 or second is single
A polychromatic light polarization interference unit 240 is made of wiregrating beam splitter 231, balzed grating, 232, plane mirror 233；Wherein glitter
Grating 232 is located in sagnac light paths branch, and the plane mirror on grating to same light path is apart from equal；Half-wave plate 220 is in it
In on a branch separated by spectroscope 210, its fast axle is perpendicular to light branch and parallel to paper；
Balzed grating, 232, two glitterings are equidistantly placed on the reflected light path and transmitted light path of wire-grid polarizing beamsplitter 231 respectively
Grating is identical, and plane mirror 233 is equidistantly placed after balzed grating, and speculum 233 is with light angle
67.5 °, two list sagnac beam splitting units are identical, and are individually positioned on the equal light splitting branch of spectroscope 210；
Optical path direction modulation microscope group is made of four plane mirrors 310,320,330,340 with a spectroscope 350, plane mirror
It is 45 ° of angles with light angle, four bundles light road 2301,2302,2401,2402 finally at convergence and one, is obtained by beam splitter
Obtain cross distribution；Then stokes parameter amplitudes are obtained on focal plane arrays (FPA) 600 by polariscope 400 and imaging len 500
The picture of modulation；Gathered finally by data collecting system 700, extract and respectively obtain whole stokes parameters corresponding two with processing
Dimension space figure.
Such as Fig. 1, preposition optics microscope group 100 is by 130 groups of object lens 110, diaphragm 120 and collimating mirror being successively set in light path
Into；Object lens 110 are telephotolens, microcobjective or common object lens.
Such as Fig. 2, single sagnac polarization beam-splitting units 230 or 240 are by wire-grid polarizing beamsplitter 231, balzed grating, 232 and put down
Face speculum 233 forms：It is equidistantly placed balzed grating, 232 in the reflection of wire-grid polarizing beamsplitter 231 and transmitted light path respectively, two
Balzed grating, is identical, and plane mirror 233 is equidistantly placed after balzed grating, and speculum is with light angle
67.5 °, two list sagnac beam splitting units are identical, and are individually positioned on the equal light splitting branch of spectroscope.
Such as Fig. 3, being distributed as four beam polarised lights 2301,2302,2401,2402 is cross, and polarization state is respectively Ey,-Ey,
Ex, ExAccumulated phase is respectively
Such as Fig. 4, spectrum distribution is obtained after interference image Fourier transformation, does Fourier's inversion after being filtered respectively
Change, can both obtain the two-dimentional polarization image of whole stokes parameters.
The operation principle of the double Sagnac polarization imaging interference devices of full stokes parameter white light of the present invention is：Two
The object lens 110 that the light that dimension space target is sent sequentially enters preposition optics microscope group 100 form intermediate image plane in field stop 120
Place, since field stop is placed in the front focal plane of collimating mirror 130, the light that intermediate image plane is sent enters partially after being collimated mirror collimation
Shake modulation module 200, and incident light is divided into reflected light 212 and transmitted light 211 by Polarization Modulation mould beam splitter 210 in the block, wherein
Transmitted light is directly entered in a dispersion sagnac polarization beam-splitting unit 230, and reflected light first passes through the half-wave plate of a De-dispersion
After 220 in corresponding sagnac polarization beam-splitting units 240 are entered；Into sagnac polarization beam-splitting units light by linearly dividing
Beam device 231, balzed grating, 232, plane mirror 233-1, unilateral speculum 233-2, then through balzed grating, 232 and wiregrating point
Finally two beam lateral shears of acquisition are directly proportional to wavelength for beam mirror 231, and the orthogonal light of direction of vibration；Reflect branch and transmission
Between branch optical path direction and light path are adjusted by two groups of plane mirrors (310,320), (330,340) so that four beams 2301,
2302nd, 2401,2402 light convergence and a bit, be then imaged onto angle by beam splitter 350, polarizer 400 and imaging len 500 and put down
Face array 600, the interference pattern of whole stokes parameter Modulation and Amplitude Modulations under white light conditions is obtained by data acquisition processing system 700
Picture, finally by you change to the Fourier transform of interference image, filtering and Fourier, so as to obtain the two of each polarized component
Dimension space figure.
Claims (2)
1. a kind of double Sagnac polarization imaging methods of white light of full stokes parameter, it is characterised in that：Make two-dimensional space target
The light sent forms intermediate image plane by processing, and for the light that intermediate image plane is sent by collimation, then beam splitting is reflected light and transmission
Light, wherein transmitted light are directly entered in a dispersion sagnac polarization beam-splitting unit, and reflected light first passes through the half of a De-dispersion
After wave plate in another dispersion sagnac polarization beam-splitting units are entered；
Light into dispersion sagnac polarization beam-splitting units passes through wire-grid polarizing beamsplitter (231), balzed grating, (232), two planes
Speculum (233), then through after another balzed grating, (232) again by wire-grid polarizing beamsplitter (231) finally obtain two beams transverse direction
Shear the orthogonal light of and direction of vibration directly proportional to wavelength；Pass through two groups of plane reflections between reflection branch and transmission branch
Mirror adjusts optical path direction and light path so that four bundles light converges at a bit；
Four bundles light passes through spectroscope (350), again by polarizer (400) polarization direction, then flat in Jiao by imaging len (500)
Face array (600) is imaged, and carries out data acquisition, to obtain the interference image of full stokes parameter Modulation and Amplitude Modulations under white light conditions,
Finally by the Fourier transform of interference image, filtering and Fourier's inverse conversion, so as to obtain the two dimension of each polarized component
Space diagram；
There is the horizontal shear capacity directly proportional to wavelength, the dispersion sagnac by the light of dispersion sagnac polarization beam-splitting units
Polarization beam-splitting unit is made of wire-grid polarizing beamsplitter (231), two balzed grating,s (232) and two plane mirrors (233)：Wiregrating
Balzed grating, (232) is equidistantly placed in the reflection of beam splitter (231) and transmitted light path respectively, it is equidistant after balzed grating,
Holding plane speculum (233), two list sagnac beam splitting units are identical, and are individually positioned in equal apart from spectroscope
It is divided on branch.
2. the double Sagnac polarization imaging methods of white light of full stokes parameter according to claim 1, it is characterised in that：
The balzed grating, (232) is the limiting case of transmission-type binary optical elements, during balzed grating, ideal sawtooth thickness is approximately
Cardiac wave grows first-order diffraction light poor with ambient refractive index with grating material, high by diffraction efficiency is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510377163.6A CN104931141B (en) | 2015-06-30 | 2015-06-30 | A kind of white light double Sagnac polarization imaging methods of full stokes parameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510377163.6A CN104931141B (en) | 2015-06-30 | 2015-06-30 | A kind of white light double Sagnac polarization imaging methods of full stokes parameter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104931141A CN104931141A (en) | 2015-09-23 |
| CN104931141B true CN104931141B (en) | 2018-04-17 |
Family
ID=54118415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510377163.6A Active CN104931141B (en) | 2015-06-30 | 2015-06-30 | A kind of white light double Sagnac polarization imaging methods of full stokes parameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104931141B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056542B (en) * | 2016-05-19 | 2018-12-07 | 西安交通大学 | A kind of interference pattern background removal approach based on frequency filtering |
| CN109856718B (en) * | 2018-12-31 | 2023-11-10 | 苏州大学 | Low-polarization two-dimensional binary blazed grating |
| CN111750799B (en) * | 2019-03-29 | 2022-03-18 | 南京理工大学 | Interference illumination-based five-dimensional information measuring device and method for spectrum polarization morphology |
| WO2023197310A1 (en) * | 2022-04-15 | 2023-10-19 | 华为技术有限公司 | Measurement system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256407A (en) * | 1999-12-28 | 2000-06-14 | 中国科学院西安光学精密机械研究所 | Interference imaging spectral technology and equipment |
| CN101871816B (en) * | 2010-06-03 | 2012-02-29 | 北京航空航天大学 | Modularized split Sagnac interferometer |
| US9068928B2 (en) * | 2010-09-03 | 2015-06-30 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | White light Sagnac interferometer polarimeters |
-
2015
- 2015-06-30 CN CN201510377163.6A patent/CN104931141B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104931141A (en) | 2015-09-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104913848B (en) | All-Stokes parameter white light double-Sagnac polarization imaging interferometer | |
| CN103592030B (en) | The full polarization hyperspectral detection device of fast illuminated integration view field imaging | |
| CN102889853B (en) | Spectral synchronous phase-shift common-path interference microscopic-detection device and detection method | |
| CN104931141B (en) | A kind of white light double Sagnac polarization imaging methods of full stokes parameter | |
| CN102297722B (en) | Double-channel differential polarizing interference imaging spectrometer | |
| CN102879097B (en) | Circular polarization hyperspectral image detection system | |
| CN107228711B (en) | Compact miniature fast illuminated channel modulation full-polarization spectrum imaging detection device and method | |
| CN104165582B (en) | Phase shift point-diffraction interference detection device and method based on reflecting grating | |
| US9097585B2 (en) | Spectrographic polarimeter and method of recording state of polarity | |
| CN107356337B (en) | Compact miniature fast illuminated channel modulation full polarization imaging detection device and detection method | |
| CN104792417A (en) | Portable compact complete-polarization high-spectral imaging unit | |
| CN102419213A (en) | Hartmann wavefront sensor based on diffraction grating arrays | |
| CN102914257A (en) | Light-splitting synchronous phase shifting interference microscopy device and detection method | |
| CN107741274A (en) | A kind of minitype polarization light spectrum image-forming detection system and method | |
| CN102865811A (en) | Orthogonal double grating based synchronous phase shifting common-path interference microscopy detection device and detection method | |
| CN104792416A (en) | Push-broom complete-polarization high-spectral integrated imaging unit | |
| CN107144351B (en) | A kind of broadband full polarization imaging method based on Mach Zehnder interferometer | |
| CN102914256A (en) | Synchronous phase shifting interference detection device based on orthogonal double grating and detection method | |
| CN111208067A (en) | Spectrum-polarization imaging measurement system | |
| CN102865810B (en) | Orthogonal double-grating based detecting device for synchronous phase shift common-light path interference and detecting method therefor | |
| CN105547480A (en) | High-throughput birefringence interference imaging spectrum device | |
| US5949480A (en) | Broad band imaging spectroradiometer | |
| CN107356333A (en) | A kind of infrared spectrum polarized imaging system and its parameter optimization collocation method | |
| EP3877734A2 (en) | Method and system for polarimetry using static geometric polarization manipulation | |
| CN107421641B (en) | A kind of broadband full polarization imaging device based on Mach Zehnder interferometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |