CN201497575U - Programmable polarization hyperspectral imager - Google Patents
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- CN201497575U CN201497575U CN200920306464XU CN200920306464U CN201497575U CN 201497575 U CN201497575 U CN 201497575U CN 200920306464X U CN200920306464X U CN 200920306464XU CN 200920306464 U CN200920306464 U CN 200920306464U CN 201497575 U CN201497575 U CN 201497575U
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Abstract
The utility model provides a programmable polarization hyperspectral imager, which comprises a front mirror, a field diaphragm, a collimating mirror and an acousto-optic tunable filter which are arranged on the same optical path; an O light imaging mirror, an O light detector and an O light detector control processing system are sequentially arranged on an O light path after the diffraction of the acousto-optic tunable filter; an E optical imaging mirror, an E optical detector and an E optical detector control processing system are sequentially arranged on an E optical path after diffraction of the acousto-optic tunable filter, and the E optical tunable filter further comprises an O optical wedge and an E optical wedge; the O optical wedge is arranged on the O optical path and is arranged between the acousto-optic tunable filter and the O optical imaging mirror; the E optical wedge is arranged on the E optical path and is arranged between the acousto-optic tunable filter and the E optical imaging mirror. The utility model discloses have many spectral bands compound imaging ability, photon count imaging ability, spectral band and spectrum transmissivity programmable ability and can acquire the super spectral image ability of cross polarization simultaneously.
Description
Technical field
The utility model relates to a kind of polarimetric hyperspectral imager, is specifically related to a kind of cross polarization spectrogram that can obtain simultaneously as information, programmable polarization hyperspectral imager with photon counting imaging capability and multispectral section complex imaging ability.
Background technology
Utilize spectrum picture information can obtain the chemical feature and the space distribution information thereof such as material composition, content of target, thereby imaging spectral technology is with a wide range of applications in the national economy fields of society.
At first, imaging spectrometer can be used as the useful load of spacecraft, utilizes its spectral information that obtains can be applied to following field: land resources survey (ore prospecting, city planning, outskirts of a town land classification utilizes, desertification of land improvement and soil erosion monitoring etc.), forestry (forest resourceies investigation and the monitoring of deforestation afforestation etc.), ecological (environmental monitoring, land ecological Studies and region environment evaluation etc.), agricultural (large tracts of land agricultural resource monitor, the crop yield prediction, the analyses and prediction of crops growing way, pest and disease monitoring etc.), survey of deep space (the moon, the mineral prospecting of celestial bodies such as Mars, solar system planetary scale detection etc.) field such as.
Secondly, spectral analysis technique also is widely used in industry-by-industries such as food and drink, petrochemical complex, weaving, clinical medicine.
Polarization image information provides physical features and space distribution informations thereof such as roughness about target, water cut, voidage, diameter of particle.
Polarization remote sensing is compared with traditional remote sensing, and many unique distinctions are arranged, and it can solve the more insurmountable problems of common photometry, cloudlike with aerocolloidal size distribution etc.
Scattered light from atural object often is a linearly polarized light, has degree of polarization more than 20% as the scattered light on crown canopy covering, arable land, grassland, the reflected light of the mud bank and the water surface has the degree of polarization more than 50%, different atural objects have different polarization characteristics, and man-made target often has the polarization characteristic stronger than natural target, utilize these polarization informations can be finally inversed by tenor in the physical arrangement, water content, rock of ground object target etc., monitoring seawater pollution situation is surveyed the Size Distribution of the distribution of hemisphere cloud, kind, height and atmospheric aerosol particle etc.
Undoubtedly, compare with the imaging polarization technology with imaging spectral technology, that the polarimetric hyperspectral imaging technique can obtain is more detailed, target information more fully.
Imaging spectral technology can be divided into interfere type (spatial modulation type according to light-dividing principle, the time modulation type), color dispersion-type (grating type and prism-type) and optical filtering type (rotating filtering sheet, liquid crystal tunable light filter (Liquid Crystal Tunable Filter, LCTF), acousto-optic tunable filter (Acousto-Optic Tunable Filter, AOTF) etc.) three kinds, every kind all has its relative merits and the scope of application thereof, wherein based on acousto-optic tunable filter (Acousto Optic Tunable Filter, AOTF) imaging spectral technology has dirigibility (the spectrum channel order or tuning at random that spectrum channel and spectral transmittance can electric tuning provide fast, hyperchannel obtains simultaneously, the intelligent independent spectrum channel is selected and is obtained, realize rectangle spectral response curve etc.), the structural compactness that movement-less part brings (adapting to abominable mechanical environment), need not complex data handles the ease for use of bringing and can obtain polarization simultaneously, many characteristics such as integration of multidimensional information such as spectrum and image (improving the ability of target detection and identification), and be with a wide range of applications.
Because natural light produces the arrowband O light and the E light of polarization state quadrature behind the AOTF diffraction, gather arrowband O light and E light image simultaneously and can constitute simple and the compactest polarimetric hyperspectral imaging system (Li-Jen Cheng, Tien-Hsin Chao, MackDowdy, Clayton LaBaw, Cohn Mahoney, George Reyes, " Multispectral imagingsystems using acousto-optic tunable filter ", Proc.SPIE Vol.1874, pp.223-231,1993.).But the prior art scheme has following defective: (1) does not possess the photon counting imaging capability and has limited detection to dark weak target; (2) do not compensate the image drift that AOTF causes when tuning, thereby cause restoring spectrum because of spectral coverage aliasing signal-to-noise ratio degradation; (3) the AOTF drive unit adopts the single-frequency drive scheme based on DDS (Direct Digital Synthesizer, Direct Digital Frequency Synthesizers) chip, can't obtain multispectral section combination picture under the multifrequency pattern.
The utility model content
In order to solve the above-mentioned technical matters that exists in the background technology, it is beam splitter with spectrum channel and transmitance electric tunable that the utility model provides a kind of, with detector such as EMCCD (ElectronMultiplying Charge-Coupled Device with photon counting imaging detection ability, electron multiplication CCD), ICCD (ItensifiedCharge-Coupled Device, enhancement mode CCD) etc. be electrooptical device, with based on FPGA (Field-Programmable Gate Array, field programmable gate array)/CPLD (Compex Programmable LogicalDevice, CPLD)+DAC (Digital to Analog Convertor, digital to analog converter) AWG (Arbitrary Waveform Generator) is an AOTF driver and by inserting the programmable polarization hyperspectral imager that wedge+image registration mode realizes the image drift compensation, has multispectral section complex imaging ability, the photon counting imaging capability, spectral coverage and spectral transmittance programmability and can obtain cross polarization HYPERSPECTRAL IMAGERY ability simultaneously.
Technical solution of the present utility model is: the utility model provides a kind of programmable polarization hyperspectral imager, comprises the preset lens, field stop, collimating mirror and the acousto-optic tunable filter AOTF that are arranged on the same light path; On the O light light path behind the AOTF diffraction, be disposed with O photoimaging mirror, O photo-detector and O photo-detector control processing system; Be disposed with E photoimaging mirror, E photo-detector and E photo-detector control processing system on the E light light path behind the AOTF diffraction, its special character is: described programmable polarization hyperspectral imager also comprises O light wedge and E light wedge; Described O light wedge is arranged on the O light light path, and places between AOTF and the O photoimaging mirror; Described E light wedge is arranged on the E light light path, and places between AOTF and the E photoimaging mirror.
Above-mentioned O light wedge is arranged on the collimated light path of O light, and described E light wedge is arranged on the collimated light path of E light.
Above-mentioned programmable polarization hyperspectral imager also comprises the AOTF driver that electrically connects with AOTF.
Above-mentioned programmable polarization hyperspectral imager also comprises the optical trap that is used to reduce the inhibition zero order diffracted light that the veiling glare to O light image and E light image disturbs, and described optical trap is arranged on the exit end of AOTF.
Above-mentioned O photo-detector and E photo-detector are the detectors with photon counting detectivity.
Above-mentioned O photo-detector and E photo-detector are EMCCD or ICCD.
Above-mentioned AOTF driver is taked the multifrequency driver based on the AWG (Arbitrary Waveform Generator) of the integrated structure of the integrated structure of FPGA and DAC or CPLD and DAC.
Above-mentioned preset lens is transmission-type preset lens, catadioptric formula preset lens or reflective preset lens.
The utility model has the advantages that:
1, can compensate image drift.The utility model is being provided with O light wedge and E light wedge respectively between AOTF and the O photoimaging mirror and between AOTF and the E photoimaging mirror, the utility model that is arranged so that of these parts can compensate image drift, and utilize the image registration mode further removal of images drift polarization spectrum is restored influence, thereby improve spectrum recovering precision and spectral signal-noise ratio.
2, possesses the photon counting imaging capability.O photo-detector that the utility model adopted and E photo-detector are the detectors that can have the photon counting detectivity, such as being EMCCD, ICCD etc., are to obtain higher detection sensitivity, have improved dark weak Target Detection Ability of Infrared greatly.
3, possess multispectral section complex imaging ability.The utility model changes existing single-frequency AOTF driver into based on the integrated structure of the integrated structure of FPGA and DAC or CPLD and DAC multifrequency AOTF driver, can realize that simultaneously a plurality of spectral coverages being carried out complex imaging surveys, thereby strengthen quick identification ability interesting target.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Referring to Fig. 1, the utility model provides a kind of programmable polarization hyperspectral imager, comprises the preset lens 2, field stop 3, collimating mirror 4 and the AOTF5 that are arranged on the same light path; On the O light light path behind the AOTF5 diffraction, be disposed with O photoimaging mirror 8, O photo-detector 9 and O photo-detector control processing system 10; Be disposed with E photoimaging mirror 12, E photo-detector 13 and E photo-detector control processing system 14 on the E light light path behind the AOTF diffraction, in addition, this programmable polarization hyperspectral imager also comprises O light wedge 7 and E light wedge 11; O light wedge 7 is arranged on the collimated light path of O light, and places between AOTF5 and the O photoimaging mirror 8; E light wedge 11 is arranged on the collimation road of E light light, and places between AOTF5 and the E photoimaging mirror 12.O photo-detector 9 and E photo-detector 13 are the detectors with photon counting detectivity, can realize the utility model purpose such as EMCCD or ICCD.Preset lens 2 can be transmission-type preset lens, catadioptric formula preset lens or reflective preset lens, and the focal plane of preset lens 2 overlaps with collimating mirror 4 front focal planes; Described field stop 3 is square, and the light-sensitive surface area of its size and visual field and O photo-detector 9, E photo-detector 13 is complementary.O photo-detector control processing system 10, E photo-detector control processing system 14 are to adopt the detector control processing system of focal plane Refrigeration Technique, correlated-double-sampling technology, low noise biasing technique and drive signal forming technique.
The work mould of control acquisition process computer installation O photo-detector control processing system 10, E photo-detector control processing system 14 and AOTF5 driver is executed and running parameter, the spectrum channel of tuning AOTF5 and spectral transmittance, gather the O light spectrum picture and the E light spectrum picture of a series of different spectral coverage of O photo-detector control processing system 10 and 14 outputs of E photo-detector control processing system, further compensate the AOTF image drift by the image configurations algorithm, obtain the polarimetric hyperspectral spectrum data cube of object scene at last by the polarization spectrum inversion algorithm.
The dispersion characteristics of O light wedge 7 optical materials and the O optical dispersion characteristic of AOTF 5 acousto-materials are complementary, and parameters such as its angle of wedge, face type need carry out matching optimization according to material behavior and the design parameter of AOTF.The E optical dispersion characteristic of the optical material dispersion characteristics of E light wedge 11 and AOTF 5 acousto-materials is complementary, and parameters such as its angle of wedge, face type need carry out matching optimization according to material behavior and the design parameter of AOTF.
Preset lens 2, collimating mirror 4, O photoimaging mirror 8, E photoimaging mirror 12 adopt the apochromatism design, and to guarantee the imaging performance in the wide spectrum scope, the entrance pupil of the emergent pupil of collimating mirror 4 and O photoimaging mirror 8 and E photoimaging mirror 12 is arranged on the center of AOTF 5.
The optical trap 6 that programmable polarization hyperspectral imager also comprises the AOTF driver 16 that electrically connects with AOTF5 and is used to reduce the inhibition zero order diffracted light that the veiling glare to O light image and E light image disturbs, optical trap 6 is arranged on the outgoing end face of AOTF5.This AOTF driver 16 is taked the multifrequency driver based on the AWG (Arbitrary Waveform Generator) scheme of FPGA+DAC structure.The work mould that control acquisition process computing machine 15 is provided with O photo-detector control processing system 10, E photo-detector control processing system 14 and AOTF driver 16 is executed and running parameter, the spectrum channel of tuning AOTF, gather the O light spectrum picture and the E light spectrum picture of a series of different spectral coverage of O photo-detector control processing system 10 and 14 outputs of E photo-detector control processing system, further compensate the AOTF image drift by the image configurations algorithm, obtain the polarimetric hyperspectral spectrum data cube of object scene at last by the polarization spectrum inversion algorithm.
AOTF 5 adopts the non-colinear design, and its acousto-material is TeO
2, TAS etc.
The described polarimetric hyperspectral imager of present embodiment partly is made up of preset lens 2, field stop 3, collimating mirror 4, AOTF 5, optical trap 6, O light wedge 7, O photoimaging mirror 8, O photo-detector 9, O photo-detector control processing system 10, E light wedge 11, E photoimaging mirror 12, E photo-detector 13, E photo-detector control processing system 14, control acquisition process computing machine 15, AOTF driver 16 etc.
In order to guarantee wide spectrum image quality and polarization spectrum signal to noise ratio (S/N ratio), preset lens 2, collimating mirror 4, O photoimaging mirror 8, E photoimaging mirror 12 adopt the apochromatism design, guarantee that monochromatic light blur circle diameter is less than the pixel dimension of O photo-detector 9 and E photo-detector 13 in full spectral coverage scope.In order to make full use of the effective aperture of AOTF 5, the entrance pupil of the emergent pupil of collimating mirror 4 and O photoimaging mirror 8 and E photoimaging mirror 12 should be arranged on the center of AOTF 5.
In order to eliminate AOTF 5 caused image drift when tuning, insert O light wedge 7 in the light path between AOTF 5 and O photoimaging mirror 8, insert E light wedge 11 in the light path between AOTF 5 and E photoimaging mirror 12, the optical material dispersion characteristics of O light wedge 7 and E light wedge 11 should be complementary with the dispersion characteristics of AOTF 5 acousto-materials, and its design parameter should be optimized, so that caused E photo-detector 13 of acousto-optic tunable and the drift of O photo-detector 13 image planes epigraphs are less than 1/10th pixels.
AOTF 5 is as tunable filter, and driving frequency that can tuning AOTF 5 is selected interested arrowband polarization spectrum.AOTF7 adopts the non-colinear design, and acousto-material can be TeO2, TAS etc., and the O light of the two-way polarization state quadrature of its output and E light all can obtain cross polarization spectrogram picture through O photoimaging mirror 8 and E photoimaging mirror 12 respectively.
In order to suppress in the AOTF outgoing beam zero order diffracted light, add optical trap 6 at the light path terminal of unwanted light, so that the stray light of its generation is as far as possible little to the influence of first-order diffraction light.
It is as follows that this polarimetric hyperspectral imager gets the course of work:
Emission, reflection or transmitted light from object scene 1 obtain image planes at its back focal plane place after preset lens 2 is collected.The field stop 3 that is positioned at preset lens 2 image planes places is constrained to the picture field range.An image planes picture of target is divided into O light light beam and E light light beam after preposition collimating mirror 4 collimations, AOTF 5 beam split.O light light beam obtains O light spectrum digital picture through O light wedge 7, O photoimaging mirror 8, O photo-detector 9 and O photo-detector control processing system subsequently 10 thereof.E light light beam obtains E light spectrum digital picture through E light wedge 11, E photoimaging mirror 12, E photo-detector 13 and E photo-detector control processing system subsequently 14 thereof.A series of O light spectrum digital picture and E light spectrum digital picture are gathered and handled to control acquisition process computing machine 15, forms the polarimetric hyperspectral data cube.Control acquisition process computing machine 15 can be selected interested arrowband polarization spectrum image or multispectral section combination picture by the frequency number and the frequency values of control AOTF driver 16 output drive signals, can control the diffraction efficiency of AOTF 5 by the power of control AOTF driver 16 output drive signals.
Claims (8)
1. a programmable polarization hyperspectral imager comprises the preset lens, field stop, collimating mirror and the acousto-optic tunable filter that are arranged on the same light path; On the O light light path behind the acousto-optic tunable filter diffraction, be disposed with O photoimaging mirror, O photo-detector and O photo-detector control processing system; Be disposed with E photoimaging mirror, E photo-detector and E photo-detector control processing system on the E light light path behind the acousto-optic tunable filter diffraction, it is characterized in that: described programmable polarization hyperspectral imager also comprises O light wedge and E light wedge; Described O light wedge is arranged on the O light light path, and places between acousto-optic tunable filter and the O photoimaging mirror; Described E light wedge is arranged on the E light light path, and places between acousto-optic tunable filter and the E photoimaging mirror.
2. programmable polarization hyperspectral imager according to claim 1 is characterized in that: described O light wedge is arranged on the collimated light path of O light, and described E light wedge is arranged on the collimated light path of E light.
3. programmable polarization hyperspectral imager according to claim 1 and 2 is characterized in that: described programmable polarization hyperspectral imager also comprises the AOTF driver that electrically connects with acousto-optic tunable filter.
4. programmable polarization hyperspectral imager according to claim 3, it is characterized in that: described programmable polarization hyperspectral imager also comprises the optical trap that is used to reduce the inhibition zero order diffracted light that the veiling glare to O light image and E light image disturbs, and described optical trap is arranged on the exit end of acousto-optic tunable filter.
5. programmable polarization hyperspectral imager according to claim 4 is characterized in that: described O photo-detector and E photo-detector are the detectors with photon counting detectivity.
6. programmable polarization hyperspectral imager according to claim 5 is characterized in that: described O photo-detector and E photo-detector are EMCCD or ICCD.
7. programmable polarization hyperspectral imager according to claim 6 is characterized in that: described acousto-optic tunable filter driver is based on the multifrequency driver of AWG (Arbitrary Waveform Generator) of the integrated structure of the integrated structure of FPGA and DAC or CPLD and DAC.
8. programmable polarization hyperspectral imager according to claim 7 is characterized in that: described preset lens is transmission-type preset lens, catadioptric formula preset lens or reflective preset lens.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957237B (en) * | 2009-07-20 | 2012-07-04 | 中国科学院西安光学精密机械研究所 | Programmable polarization hyperspectral imager |
| WO2014036843A1 (en) * | 2012-09-05 | 2014-03-13 | 天津奇谱光电技术有限公司 | Spectrum analysis device |
| CN103728019A (en) * | 2013-12-19 | 2014-04-16 | 南京邮电大学 | Spectrum measurement device and method based on acousto-optic modulation |
-
2009
- 2009-07-20 CN CN200920306464XU patent/CN201497575U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957237B (en) * | 2009-07-20 | 2012-07-04 | 中国科学院西安光学精密机械研究所 | Programmable polarization hyperspectral imager |
| WO2014036843A1 (en) * | 2012-09-05 | 2014-03-13 | 天津奇谱光电技术有限公司 | Spectrum analysis device |
| CN103728019A (en) * | 2013-12-19 | 2014-04-16 | 南京邮电大学 | Spectrum measurement device and method based on acousto-optic modulation |
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Granted publication date: 20100602 Termination date: 20110720 |