CN103344336A - Acousto-optic painting-type imaging spectrometer capable of achieving high-accuracy wave band registration - Google Patents

Acousto-optic painting-type imaging spectrometer capable of achieving high-accuracy wave band registration Download PDF

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Publication number
CN103344336A
CN103344336A CN2013103151441A CN201310315144A CN103344336A CN 103344336 A CN103344336 A CN 103344336A CN 2013103151441 A CN2013103151441 A CN 2013103151441A CN 201310315144 A CN201310315144 A CN 201310315144A CN 103344336 A CN103344336 A CN 103344336A
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CN
China
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wave band
acousto
optic
imaging
array detector
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CN2013103151441A
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Chinese (zh)
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赵慧洁
张颖
周鹏威
王子叶
师少光
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北京航空航天大学
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Priority to CN2013103151441A priority Critical patent/CN103344336A/en
Publication of CN103344336A publication Critical patent/CN103344336A/en

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Abstract

The invention provides an acousto-optic painting-type imaging spectrometer capable of achieving high-accuracy wave band registration. The imaging spectrometer can complete acousto-optic painting-type spectroscopic data high-accuracy registration. The acousto-optic painting-type imaging spectrometer mainly comprises a front-arranged light path, a polarizer, an acousto-optic adjustable harmonic wave filter, a polarizing beam splitter, an imaging spectrum channel, a wave band mismatch measurement channel and main control system. The acousto-optic painting-type imaging spectrometer obtains a polychromatic light image which shares a view field with the imaging spectrum channel through the wave band mismatch measurement channel, the polychromatic light image feature that the gray level cannot be changed along with wave bands is used for resolving the conversion matrixes between the wave band spectrum images of the imaging spectrum channel, and accordingly the purpose that wave band mismatch caused by gesture changing of a device is corrected is achieved. Correcting of wave band mismatch caused by an unstable platform when the acousto-optic painting-type imaging spectrometer is practically used is achieved, and accuracy of spectroscopic data is improved.

Description

A kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration

Affiliated technical field

The present invention relates to a kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration, belong to the spectral remote sensing instrument field, can improve and carry the sequential serial spectrum picture wave band registration accuracy of obtaining under the unstable situation of platform, thereby alleviate the wave band registration to the requirement of platform stable.

Background technology

Acousto-optic picture formula imaging spectrometer adopts acousto-optic tunable filter (Acousto-optic Tunable Filter, AOTF) as light-splitting device, it is tuning fast to have wave band, movement-less part, good reliability, characteristics such as volume is small and exquisite are very extensive in field application prospects such as military surveillance and environmental monitorings.But because acousto-optic imaging spectrometer moment leaches some band images to the silent frame visual field, when obtaining all band image, need the regular hour to finish scanning on the principle.Therefore, than grating/interference push-broom type imaging spectrometer, the spectrum dimension image that its instability of carrying platform will cause mode chronologically to be obtained can produce deformation, rotation and translation, makes that same pixel namely produces the spectrum mismatch corresponding to different atural objects on each band image.Will produce distortion when utilizing these not calibrated data to carry out spectrum recovering, finally influence diagnosis and the quantitative inversion precision of type of ground objects.

The spectral resolution that improves constantly and spatial resolution are the inexorable trends of imaging spectral Detection Techniques development.Yet, the increase of wave band number causes acousto-optic imaging spectrometer data acquisition time to prolong, the raising of spatial resolution causes deformation, rotation and the translational movement of each band image to increase, therefore platform stable is had higher requirement, the difficulty of wave band registration is strengthened, become the technical bottleneck that restriction acousto-optic picture formula imaging spectrometer is used.

Continue to bring out though handle the high precision wave band method for registering of original mismatch data, alleviated picture formula imaging spectrometer to a certain extent to carrying the dependence of platform stable, realize that automatic, high precision spectrum registration acquires a certain degree of difficulty.For example the method registration accuracy height at artificial selection image reference mark waste time and energy but manual intervention realizes the hyperspectral mass data registration, and registration accuracy descends when the reference mark does not have obvious characteristic; Mostly the inferior pixel registration algorithm of automatic, high precision is to utilize similar, the correlativity of image to realize that the similarity of image subject to registration and registering images is more high, and then registration accuracy is more high.And each band image that the acousto-optic imaging spectrometer obtains differs greatly, correlativity is not high, and head and the tail wave band signal to noise ratio (S/N ratio) is lower, directly these data are carried out similar/that relevant registration will reach high registration accuracy difficulty is very big.

Summary of the invention

Technology of the present invention is dealt with problems and is: the deficiency that overcomes existing acousto-optic picture formula imaging spectrometer wave band mismatch under the unstable situation of platform, under the condition of not obvious increase system complexity, provide a kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration.

Technical solution of the present invention is: a kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration, and it comprises:

Preposition light path: be positioned at imaging spectrometer foremost, be used for collecting extraneous natural light.

Polaroid: be positioned at after the preposition light path, be used for realizing rising partially of incident beam.

Acousto-optic tunable filter: be positioned at after the polaroid, be used for the automatically controlled spectrum light splitting of incident beam, produce monochromatic diffraction light and the secondary color transmitted light of polarization state quadrature.

Polarization spectroscope: be positioned at after the acousto-optic tunable filter, be used for realizing that monochromatic diffraction light separates with the space of secondary color transmitted light.

Imaging spectral passage: be positioned at after the polarization spectroscope, formed by diffraction light imaging mirror group and imaging spectral planar array detector, be used for the monochromatic diffraction light imaging controlled to wave band, realize obtaining of spectrum picture.

The wave band mismatch is measured passage: be positioned at after the polarization spectroscope, measuring planar array detector by transmitted light imaging mirror group and wave band mismatch forms, be used for the secondary color transmitted light is carried out imaging, each the band spectrum image that obtains for the imaging spectral passage provides the wave band registration required transition matrix.

Master control system: the guide sound optic tunable filter changes the branch optical wavelength, control imaging spectral planar array detector and wave band mismatch are measured the triggering collection control that planar array detector is finished image, and the service data handling procedure, the transition matrix that carries out the secondary color transmitted light images resolves the wave band geometric precision correction with spectrum picture.

Wherein, the polychromatic light energy of described wave band mismatch measurement planar array detector collection does not change with the wavelength switching of acousto-optic tunable filter.

Wherein, described imaging spectral passage and wave band mismatch are measured passage visual field altogether, and interchannel transition matrix is determined by demarcating accurately.

Wherein, the image acquisition that described imaging spectral planar array detector and wave band mismatch are measured planar array detector adopts electric trigger pip control respectively, and the trigger pip frequency of wave band mismatch measurement planar array detector and imaging spectral planar array detector is the same.

Principle of the present invention is: light beam is risen partially by polaroid after preposition light path, tells monochromatic diffraction light and secondary color transmitted light by AOTF then, through the polarisation spectroscope monochromatic diffraction light is separated with secondary color transmitted light mirror image space again.Monochromatic diffraction light is imaged on the imaging spectral planar array detector through diffraction light imaging mirror group, changes the AOTF diffraction wavelength by master control system, and control detector collection spectrum picture, realizes obtaining of spectral image data; The secondary color transmitted light is measured on the planar array detector through being imaged on the wave band mismatch after the transmitted light imaging mirror group, master control system is obtained the secondary color transmitted light images synchronously when gathering diffraction spectra data, and resolve transition matrix between each transmitted light images by the method that data are handled, and measure the transition matrix that interchannel is demarcated in advance in conjunction with light spectrum image-forming passage and wave band mismatch, determine the transition matrix between each wave band of spectrum picture, thereby realize the wave band registration.

The present invention is with the advantage that existing acousto-optic picture formula imaging spectrometer is compared: the present invention utilizes polarized light splitting device, mirror image separates diffraction light and secondary color transmitted light, when obtaining diffraction spectra data, gather the secondary color transmitted light images of optical frames picture symmetry and common visual field simultaneously, obtain the spectrum registration information by the multiprecision arithmetic with source data at the secondary color transmitted light images again, to realize the high registration accuracy of light spectrum image-forming passage mismatch data, reduced acousto-optic picture formula imaging spectrometer demand to high precision stable platform/attitude measurement system when high spectrum/spatial resolution is used.Gently little, the common visual field of the common preposition light path scenario-frame of binary channels of the present invention, and binary channels geometrical optics parameter consistency is good, has guaranteed the wave band registration accuracy of light spectrum image-forming spectroscopic data that passage obtains.

Description of drawings

Fig. 1 is a kind of acousto-optic picture formula imaging spectrometer structured flowchart of realizing high precision wave band registration of the present invention;

Embodiment

As shown in Figure 1, the present invention measures passage 6 by preposition light path 1, polaroid 2, acousto-optic tunable filter 3, polarization spectroscope 4, imaging spectral passage 5, wave band mismatch and master control system 11 is formed, imaging spectral passage 5 mainly is made up of diffraction light imaging mirror group 7 and imaging spectral planar array detector 8, and the wave band mismatch is measured passage 6 and mainly is made up of transmitted light imaging mirror group 9 and wave band mismatch measurement planar array detector 10.

Preposition light path 1 receives the natural light of the scene that comes from the outside, the natural light that polaroid 2 is collected preposition light path 1 rises partially, make it satisfy the requirement of AOTF incident ray polarized light, simultaneously, picture side's aperture angle of preposition light path 1 emergent ray is limited within the aperture angle accepted of AOTF, and suppresses to guarantee veiling glare.AOTF is under the control of master control system 11, incident polarized light is carried out the acoustooptic diffraction effect, isolate monochromatic diffraction light and the secondary color transmitted light of polarized orthogonal, monochromatic diffraction light is with control generation wavelength and the energy variation of master control system 11, and the energy of secondary color transmitted light does not change with the control of master control system 11.Polarization spectroscope 4 has the two-beam line of polarized orthogonal is reflected ability with transmission respectively by the polarization state difference, among the present invention, polarization spectroscope 4 forms miter angle with preposition system optical axis, because monochromatic diffraction light and secondary color transmitted light have the geometric divergence characteristic of symmetry, make monochromatic diffraction light look like to separate at space mirror with the secondary color transmitted light.Monochromatic diffraction light is via 7 imagings on imaging spectral planar array detector 8 of diffraction light imaging mirror group; The secondary color transmitted light is measured imaging on the planar array detector 10 via transmitted light imaging mirror group 9 in the wave band mismatch.Diffraction light imaging mirror group 7 has consistent optical parametric with transmitted light imaging mirror group 9, and the geometrical optics parameter that makes imaging spectral passage 5 and wave band mismatch measure passage 6 is tried one's best consistent.

During instrument work, diffraction light wavelength of the master control system 11 control every switchings of AOTF just sends an electric trigger pip to imaging spectral planar array detector 8, to gather a spectral image data under the current wave band; And 10 collections of wave band mismatch measurement planar array detector is high-octane secondary color transmitted light images.The present invention has adopted the electric signal hardware trigger to finish the control of imaging spectral passage 5 and wave band mismatch being measured passage 6, imaging spectral passage 5 trigger pips have identical initial phase and frequency with the trigger pip that the wave band mismatch is measured passage 6, and adopt rising edge to trigger.When imaging spectral passage 5 obtains the spectrum picture of a wave band, in same integral time, gather the polychromatic light image that a complementary wave section mismatch is measured passage 6 simultaneously.

Therefore under the control of master control system 11, gather several consecutive images that imaging spectral planar array detector 8 and wave band mismatch are measured planar array detector 10 synchronously, calculate imaging spectral planar array detector 8 then and obtain transition matrix information between image, thereby obtain corresponding different-waveband spectrum picture and obtain the characteristics of motion of lower platform constantly in difference, after data are handled, can remove the wave band mismatch that the platform shake causes.

Because optical design and the problem of debuging, the wave band mismatch is measured the not strict spacial alignment of planar array detector 10 and imaging spectral planar array detector 8, therefore light spectrum image-forming passage 5 and wave band mismatch are measured 6 need of passage and have been demarcated the conversion matrix in advance, measure image motion information that passage 6 resolves to the accurate transformation of light spectrum image-forming passage 5 spectrum picture movable informations, for the wave band registration provides precise information to realize the wave band mismatch.

The content that is not described in detail in the instructions of the present invention belongs to this area professional and technical personnel's known prior art.

Claims (4)

1. the acousto-optic picture formula imaging spectrometer that can realize high precision wave band registration is characterized in that: comprising:
Preposition light path (1): be positioned at imaging spectrometer foremost, be used for collecting extraneous natural light;
Polaroid (2): be positioned at preposition light path (1) afterwards, be used for realizing rising partially of incident beam;
Acousto-optic tunable filter (3): be positioned at polaroid (2) afterwards, be used for the automatically controlled spectrum light splitting of incident beam, produce monochromatic diffraction light and the secondary color transmitted light of polarization state quadrature;
Polarization spectroscope (4): be positioned at acousto-optic tunable filter (3) afterwards, be used for realizing that monochromatic diffraction light separates with the space of secondary color transmitted light;
Imaging spectral passage (5): be positioned at polarization spectroscope (4) afterwards, formed by diffraction light imaging mirror group (7) and imaging spectral planar array detector (8), be used for the monochromatic diffraction light imaging controlled to wave band, realize obtaining of spectrum picture;
The wave band mismatch is measured passage (6): be positioned at polarization spectroscope (4) afterwards, measuring planar array detector (10) by transmitted light imaging mirror group (9) and wave band mismatch forms, be used for the secondary color transmitted light is carried out imaging, each the band spectrum image that obtains for imaging spectral passage (5) provides the wave band registration required transition matrix;
Master control system (11): guide sound optic tunable filter (3) changes the branch optical wavelength, control imaging spectral planar array detector (8) and wave band mismatch are measured the triggering collection control that planar array detector (10) is finished image, and the service data handling procedure, the transition matrix that carries out the secondary color transmitted light images resolves the wave band geometric precision correction with spectrum picture.
2. a kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration according to claim 1 is characterized in that: described wave band mismatch is measured polychromatic light energy that planar array detector (10) gathers and is not switched with the wavelength of acousto-optic tunable filter (3) and do not change.
3. a kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration according to claim 1, it is characterized in that: described imaging spectral passage (5) and wave band mismatch are measured passage (6) visual field altogether, and the coordinate conversion matrix between the passage image planes is determined by demarcating accurately.
4. a kind of acousto-optic picture formula imaging spectrometer of realizing high precision wave band registration according to claim 1, it is characterized in that: the image acquisition that described imaging spectral planar array detector (8) and wave band mismatch are measured planar array detector (10) adopts electric trigger pip control respectively, and the trigger pip frequency of wave band mismatch measurement planar array detector (10) and imaging spectral planar array detector (8) is the same.
CN2013103151441A 2013-07-25 2013-07-25 Acousto-optic painting-type imaging spectrometer capable of achieving high-accuracy wave band registration CN103344336A (en)

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Application publication date: 20131009