CN104931141A - White-light dual-Sagnac polarization imaging method for full Stokes parameter - Google Patents
White-light dual-Sagnac polarization imaging method for full Stokes parameter Download PDFInfo
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Abstract
The invention discloses a white-light dual-Sagnac polarization imaging method for full Stokes parameters. Light emitted by a two-dimension space target is processed to form a middle image plane, and light emitted by the middle image plane is collimated and split into reflected light and transmitted light. The transmitted light directly enters one dispersion sagnac polarization splitting unit, the reflected light firstly enters a half-wavelength plate for dispersion elimination and then enters the other dispersion sagnac polarization splitting unit, and after processing, two beams of light are finally obtained, wherein the two beams of light are mutually perpendicular in vibration direction, and the transverse shearing and the wavelength of the light are proportional. The four beams of light are made to gather in one point, and are imaged to a an angle plane array through an imaging lens after light splitting and polarization, then an interference image subjected to all stokes parameter amplitude modulation in a white-light condition is obtained, and finally a two-dimension space diagram of all polarization components is obtained. The white-light dual-Sagnac polarization imaging method has potential application values in the fields of astro-observation, earth remote sensing, machine visual senses, biomedical diagnosis and the like.
Description
Technical field
The invention belongs to remote optical sensing field of detecting, relate to a kind of polarization imaging device for polarized radiation field of detecting, particularly the two Sagnac polarization imaging interferometer of a kind of white light of full stokes parameter and formation method thereof.
Background technology
Containing important polarization remote sensing information in the electromagnetic wave of reflections off objects, can not only be used for removing ground unrest, improve the information such as the surface of contrast, pattern, shade and roughness, the physicochemical characteristicss such as the size of inverting target, concentration can also be used for.Polarization imaging is that one obtains object space and the advanced remote sensing of polarization information simultaneously, to improving target detection, the efficiency of identification and classification and precision, there are certain potentiality, freeing in military surveillance, earth resources generaI investigation, environmental health monitoring and surveilliance, disaster forecast, atmospheric exploration, astronomical sight, machine vision, the numerous areas such as biomedical diagnostic all will have important using value and prospect.Although polarization imaging technology is a novel foreword remote sensing, the remote sensing advantage of its uniqueness has caused the attention of domestic and international important mechanism.The large project that foreign study mechanism mainly concentrates on the countries such as U.S., day, Europe relies on unit, the military, university etc.; Studies in China mechanism mainly contains Anhui ray machine institute, Xi'an ray machine institute, Xi'an Communications University etc. at present, and the polarized radiation Detection Techniques reported differ from one another.
Polarization imager generally adopts 4f imaging arrangement, or mirror imaging structure (sagnac structure).It can be divided into Active Imaging and imaging and passive imaging technology according to imaging technique according to light source, and Active Imaging is with Muller polarization imaging for representative, and its light source is known or controlled, utilizes detector can detect the polarization state of target; Imaging and passive imaging generally with stokes polarization imaging for representative.Data reduction pattern can be divided into, Fourier analysis method, channel modulation pattern according to data processing method.Data reduction pattern refers to that the polarization information of acquisition is larger than required polarization state dimension, by to polarization information carry out required for data processing acquisition polarization state; And Fourier analysis method is the Fourier series expression formula being obtained the light intensity about the progressive angle of rotation by rotating wave plate, eventually passes fortran and obtain stokes parameter; Channel modulation type is by different polarization states parameter Modulation and Amplitude Modulation in different frequencies, thus carries out process acquisition polarization state information to data.Timing polarization imager can be divided into again, with non-sequential polarization imager according to the time.Timing mainly obtains different polarization states by rotatory polarization sheet, thus carries out the required information of data processing acquisition, and its shortcoming is can not to dynamic object imaging; Non-sequential can be divided into a point amplitude type again, point aperture Xing Fen focal plane type and channel modulation type, and divide an amplitude type generally to need multiple detector, data syn-chronization is more difficult, the larger and more complicated of instrument volume.Point aperture type produces several figure on a detector, and resolution is lower, makes difficulty; Divide focal plane type main space resolution lower; Channel modulation type obtains polarization information on single image, and such polarization imager can obtain all Stokes polarization parameter information on two-dimensional space in the short time, and makes the advantages such as simple.The invention belongs to channel modulation type snapshot polarization imager.
Summary of the invention
The object of the present invention is to provide a kind of can the polarization imaging method of the full stokes parameter of target under instantaneous acquisition white light conditions, it utilizes the chromatic dispersion principle of blazed grating and sagnac light channel structure to obtain the light beam shearing displacement be directly proportional to wavelength, interfered between two by four bundle polarized lights of special distribution, final acquisition is by the amplitude-modulated interference fringe image of stokes parameter, interference fringe frequency and wavelength are inversely proportional to, be directly proportional to shearing displacement, thus eliminate the impact of wavelength.
The object of the invention is to be achieved through the following technical solutions:
The two Sagnac polarization imaging method of white light of this full stokes parameter: the light that two-dimensional space target is sent forms intermediate image plane through process, the light that intermediate image plane sends is through collimation, then beam splitting is reflected light and transmitted light, wherein transmitted light directly enters in a dispersion sagnac polarization beam-splitting unit, and reflected light is first entering in another dispersion gnac polarization beam-splitting unit after the half-wave plate of a De-dispersion; Enter the light of dispersion sagnac polarization beam-splitting unit by linear beam splitter, blazed grating, plane mirror, plane mirror, more finally obtain two bundle lateral shears through blazed grating and linear beam splitter and be directly proportional and the orthogonal light of direction of vibration to wavelength; Regulate optical path direction and light path by two groups of plane mirrors between reflection branch road and transmission branch road, make four bundle light converge at a bit; Four bundle light are through beam splitter, again by polaroid polarization direction, angle plane array is imaged onto again by imaging len, carry out data acquisition, to obtain under white light conditions all amplitude-modulated interference images of stokes parameter, finally by the Fourier's inverse conversion to interference image, filtering and Fourier transform, thus obtain the two-dimensional space figure of each polarized component.
Further, above-mentioned blazed grating is the limiting case of transmission-type binary optical elements, and it is poor that the desirable sawtooth thickness of diffraction grating is approximately centre wavelength and grating material and ambient refractive index, and can will obtain the high first-order diffraction light of diffraction efficiency.
Further, the light above by dispersion sagnac polarization beam-splitting unit has lateral shear effect, and shearing displacement is directly proportional to wavelength.
The present invention has following beneficial effect:
1, the present invention can obtain polarization information to the extraterrestrial target under polychromatic light condition, remains spatial information and the colouring information of target simultaneously;
2, only need to a two field picture of two-dimensional space target, namely can obtain the information such as its polarization, temporal resolution is high, avoids the impact that environmental change brings, and work efficiency is high.
3, data processing is simple and quick, can detect target in real time.
Accompanying drawing explanation
Fig. 1 is the two Sagnac polarization imaging interference device of white light of the full stokes parameter realizing the present invention's invention;
Fig. 2 is single sagnac structure spectrophotometric unit;
Fig. 3 is by four bundle Light distribation after spectroscope;
Fig. 4 obtains frequency spectrum profile after interference image Fourier transform.
Wherein: 100, preposition optical frames group, 200, the full Polarization Modulation module of white light, 300, optical path direction modulating mirror group, 400, polariscope, 500, imaging len, 600, planar array detector, 700, data acquisition processing system, 110, object lens, 120, field stop, 130, collimation lens; 210, spectroscope, 220, half-wave plate, 230, the first single polychromatic light polarization interference unit, 240, the second single polychromatic light polarization interference unit, 231, wiregrating beam splitter, 232, blazed grating, 233, plane mirror, 2301,2302 be respectively by single sagnca beam splitting unit 230 obtain polarized light, 204,2402 are respectively the polarized light obtained by the second single polychromatic light polarization interference unit 240; 310,320,330,340, four plane mirrors in optical path direction modulating mirror group, 350, spectroscope; 400 is polariscope; 500 is imaging len; 600, focal plane arrays (FPA).
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.
The two Sagnac polarization imaging method of white light of this full stokes parameter of the present invention is: the light that two-dimensional space target is sent forms intermediate image plane through process, the light that intermediate image plane sends is through collimation, then beam splitting is reflected light and transmitted light, wherein transmitted light directly enters in a dispersion sagnac polarization beam-splitting unit, and reflected light is first entering in another dispersion sagnac polarization beam-splitting unit after the half-wave plate of a De-dispersion; Enter the light of dispersion sagnac polarization beam-splitting unit by linear beam splitter 231, blazed grating 232, plane mirror 233-1, plane mirror 233-2, more finally obtain two through blazed grating 232 and linear beam splitter 231 and restraint lateral shear and be directly proportional and the orthogonal light of direction of vibration to wavelength; Optical path direction and light path is regulated by two groups of plane mirrors between reflection branch road and transmission branch road, four bundle light are made to converge at a bit, four bundle light are through beam splitter, again by polaroid polarization direction, angle plane array is imaged onto again by imaging len, carry out data acquisition, to obtain under white light conditions all amplitude-modulated interference images of stokes parameter, finally by the Fourier transform to interference image, filtering and Fourier's inverse conversion, thus obtain the two-dimensional space figure of each polarized component.Have lateral shear effect by the light of dispersion sagnac polarization beam-splitting unit, shearing displacement is directly proportional to wavelength.Described blazed grating 232 is the limiting case of transmission-type binary optical elements, and it is poor that the desirable sawtooth thickness of diffraction grating is approximately centre wavelength and grating material and ambient refractive index, and can will obtain the high first-order diffraction light of diffraction efficiency.
As shown in Figure 1, in order to realize method of the present invention, the invention provides a kind of embodiment of the two Sagnac polarization imaging interferometer of white light of full stokes parameter, this interferometer is made up of to the preposition optical frames group 100 set gradually, the full Polarization Modulation module 200 of white light, optical path direction modulating mirror group 300, polariscope 400, imaging len 500, planar array detector 600 and data acquisition processing system 700 incident light;
Preposition optical frames group 100 is made up of the object lens 110 be successively set in light path, field stop 120, collimation lens 130; The full Polarization Modulation module 200 of white light is by spectroscope 210, and the first single polychromatic light polarization interference unit 240 of single polychromatic light polarization interference unit 230, second and half-wave plate 220 form; The single polychromatic light polarization interference unit 240 of described first single polychromatic light polarization interference unit 230 or the second is made up of wiregrating beam splitter 231, blazed grating 232, plane mirror 233; Wherein blazed grating 232 is positioned in sagnac light path branch, and grating to the level crossing on same light path apart from equal; Half-wave plate 220 is on one of them branch road separated by spectroscope 210, and its fast axle is perpendicular to light branch road and be parallel to paper;
The reflected light path of wire-grid polarizing beamsplitter 231 and transmitted light path distinguish equidistant placement blazed grating 232, two blazed gratings are identical, equidistant holding plane catoptron 233 after blazed grating, catoptron 233 and light angle are 67.5 °, two single sagnac beam splitting unit are identical, and are placed on the equal light splitting branch road of distance spectroscope 210 respectively; Optical path direction modulating mirror group is made up of four plane mirrors, 310,320,330,340 and spectroscope 350, plane mirror and light angle are 45 ° of angles, four beam optical paths 2301,2302,2401,2402 finally converge and a place, obtain cross distribution by beam splitter; Then on focal plane arrays (FPA) 600, the amplitude-modulated picture of stokes parameter is obtained by polariscope 400 and imaging len 500; Gather finally by data acquisition system (DAS) 700, extract and process and obtain two-dimensional space figure corresponding to whole stokes parameter respectively.
As Fig. 1, preposition optical frames group 100 is made up of the object lens 110 be successively set in light path, diaphragm 120 and collimating mirror 130; Object lens 110 are telephotolens, microcobjective or common object lens.
As Fig. 2, single sagnac polarization beam-splitting unit 230 or 240 is made up of wire-grid polarizing beamsplitter 231, blazed grating 232 and plane mirror 233: the equidistant placement blazed grating 232 of difference in the reflection and transmission light path of wire-grid polarizing beamsplitter 231, two blazed gratings are identical, equidistant holding plane catoptron 233 after blazed grating, catoptron and light angle are 67.5 °, two single sagnac beam splitting unit are identical, and are placed on respectively on the equal light splitting branch road of distance spectroscope.
As Fig. 3, being distributed as of four bundle polarized lights 2301,2302,2401,2402 is cross, and polarization state is respectively E
y,-E
y, E
x, E
xaccumulated phase is respectively
As Fig. 4, after interference image Fourier transform, obtain spectrum distribution, after being carried out filtering, do inverse Fourier transform respectively, both can obtain the two-dimentional polarization image of whole stokes parameter.
The principle of work of the two Sagnac polarization imaging interference device of full stokes parameter white light of the present invention is: the object lens 110 that the light that two-dimensional space target sends enters preposition optical frames group 100 successively form intermediate image plane in field stop 120 place, because field stop is placed in the front focal plane of collimating mirror 130, therefore the light that intermediate image plane sends enters Polarization Modulation module 200 after being collimated mirror collimation, incident light is divided into reflected light 212 and transmitted light 211 by the beam splitter 210 in Polarization Modulation module, wherein transmitted light directly enters in a dispersion sagnac polarization beam-splitting unit 230, reflected light is first entering in corresponding sagnac polarization beam-splitting unit 240 after the half-wave plate 220 of a De-dispersion, enter the light of sagnac polarization beam-splitting unit by linear beam splitter 231, blazed grating 232, plane mirror 233-1, unilateral catoptron 233-2, finally obtain two through blazed grating 232 and wiregrating beam splitter 231 again to restraint lateral shear and be directly proportional to wavelength, and the orthogonal light of direction of vibration, by two groups of plane mirrors (310 between reflection branch road and transmission branch road, 320), (330, 340) optical path direction and light path is regulated, make four bundles 2301, 2302, 2401, 2402 light converge and a bit, then through beam splitter 350, polaroid 400 and imaging len 500 are imaged onto angle plane array 600, whole amplitude-modulated interference image of stokes parameter under obtaining white light conditions by data acquisition processing system 700, finally by the Fourier transform to interference image, your conversion of filtering and Fourier, thus obtain the two-dimensional space figure of each polarized component.
Claims (3)
1. the two Sagnac polarization imaging method of the white light of a full stokes parameter, it is characterized in that: the light that two-dimensional space target is sent forms intermediate image plane through process, the light that intermediate image plane sends is through collimation, then beam splitting is reflected light and transmitted light, wherein transmitted light directly enters in a dispersion sagnac polarization beam-splitting unit, and reflected light is first entering in another dispersion sagnac polarization beam-splitting unit after the half-wave plate of a De-dispersion; Enter the light of dispersion sagnac polarization beam-splitting unit by linear beam splitter (231), blazed grating (232), plane mirror (233-1), plane mirror (233-2), more finally obtain two through blazed grating (232) and linear beam splitter (231) and restraint lateral shear and be directly proportional and the orthogonal light of direction of vibration to wavelength; Regulate optical path direction and light path by two groups of plane mirrors between reflection branch road and transmission branch road, make four bundle light converge at a bit; Four bundle light are through beam splitter, again by polaroid polarization direction, angle plane array is imaged onto again by imaging len, carry out data acquisition, to obtain under white light conditions all amplitude-modulated interference images of stokes parameter, finally by the Fourier transform to interference image, filtering and Fourier's inverse conversion, thus obtain the two-dimensional space figure of each polarized component.
2. the two Sagnac polarization imaging method of the white light of full stokes parameter according to claim 1, it is characterized in that: the limiting case that described blazed grating (232) is transmission-type binary optical elements, it is poor that the desirable sawtooth thickness of diffraction grating is approximately centre wavelength and grating material and ambient refractive index, and can will obtain the high first-order diffraction light of diffraction efficiency.
3. the two Sagnac polarization imaging method of the white light of full stokes parameter according to claim 1, is characterized in that: have lateral shear effect by the light of dispersion sagnac polarization beam-splitting unit, shearing displacement is directly proportional to wavelength.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056542A (en) * | 2016-05-19 | 2016-10-26 | 西安交通大学 | Interferogram background removing method based on frequency domain filtering |
| CN109856718A (en) * | 2018-12-31 | 2019-06-07 | 苏州大学 | Low degree of polarization two dimension binary blazed grating |
| CN111750799A (en) * | 2019-03-29 | 2020-10-09 | 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 |
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| 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 |
| CN101871816A (en) * | 2010-06-03 | 2010-10-27 | 北京航空航天大学 | Modularized split Sagnac interferometer |
| US20120176622A1 (en) * | 2010-09-03 | 2012-07-12 | University Of Arizona | White light sagnac interferometer polarimeters |
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Patent Citations (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 |
| CN101871816A (en) * | 2010-06-03 | 2010-10-27 | 北京航空航天大学 | Modularized split Sagnac interferometer |
| US20120176622A1 (en) * | 2010-09-03 | 2012-07-12 | University Of Arizona | White light sagnac interferometer polarimeters |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106056542A (en) * | 2016-05-19 | 2016-10-26 | 西安交通大学 | Interferogram background removing method based on frequency domain filtering |
| 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 |
| CN109856718A (en) * | 2018-12-31 | 2019-06-07 | 苏州大学 | Low degree of polarization two dimension binary blazed grating |
| CN109856718B (en) * | 2018-12-31 | 2023-11-10 | 苏州大学 | Low-polarization two-dimensional binary blazed grating |
| CN111750799A (en) * | 2019-03-29 | 2020-10-09 | 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 |
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