CN202837540U - Onboard spectral calibration system of space-time combined modulation interference imaging spectrometer - Google Patents
Onboard spectral calibration system of space-time combined modulation interference imaging spectrometer Download PDFInfo
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- CN202837540U CN202837540U CN201220437939.0U CN201220437939U CN202837540U CN 202837540 U CN202837540 U CN 202837540U CN 201220437939 U CN201220437939 U CN 201220437939U CN 202837540 U CN202837540 U CN 202837540U
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Abstract
The utility model provides an onboard spectral calibration system of a space-time combined modulation interference imaging spectrometer. The onboard spectral calibration system solves the technical problems in the prior art that it is difficult and highly risky to design an onboard calibration system on a space-time combined modulation interference imaging spectrometer; and the structural volume is huge. The onboard spectral calibration system of the space-time combined modulation interference imaging spectrometer comprises an integrating sphere, calibrating lamps arranged on the inlets of the integrating sphere, a spectral glass arranged on the outlet of the integrating sphere and a reflecting prism. The reflecting prism makes the light passing through the spectral glass reflected to the onboard calibration view field of a primary image plane. The onboard calibration view field is a full view field in the spectral dimension X direction and an edge partial view field in the space dimension Y direction. The system provided by the utility model prevents the risks generated by the addition of moving pendulum mirrors when a calibration light source is introduced from the front of a main system and further prevents a huge structure. The thin reflecting prism has a compact structure. The system has a simple structure and occupies a small axial space in an optical system.
Description
Technical field
The utility model relates to the star polishing wax scaling system of satellite remote sensing inteference imaging spectrometer.
Background technology
The inteference imaging spectrometer of time, spaces union modulation is a kind of instrument that imaging camera and spectrometer are integrated, not only can obtain simultaneously image and the spectral information of ground object target, and have high flux, hyperchannel, parasitic light is low, spectral range is wide advantage, therefore as the useful load of satellite remote sensing, the application of this instrument is more and more, has preferably development prospect.
Advanced, the technical sophistication of the inteference imaging spectrometer principle of time, spaces union modulation.The principle of its light spectrum image-forming is the thing light imaging on system's focal plane that enters main system, each light produces interference by the shearing interferometer of system simultaneously, and at the interferogram of system's focal plane formation along shear direction, namely show the interferogram (interference fringe) that interference strength distributes along this direction, the optical path difference of interferogram is corresponding with the field angle of light, what form at focal plane at last is the two dimensional image of superposition fringes, the interferogram direction is the direction of reflection target optical spectrum information, can be described as the spectrum direction, with the spectrum perpendicular direction be direction in space.Spectrometer along the spectrum direction push away sweep and expose frame by frame, when storing image, just formed series, corresponding to the interference image of adjacent fields of view.With the every column data of direction in space frame by frame, extract by column along the spectrum dimension, then be spliced into the interferogram of every row pixel when image is processed, with interferogram process, spectrum recovering, obtain the recovery spectrum of each pixel.Recovery spectrum picture with all pixels of face battle array, each spectral coverage is spliced into monochrome, two-dimensional space image at last, can form the data cube of multispectral section spatial image.
Inteference imaging spectrometer is the instrument of measuring remote sensing target image and spectral information, guarantee the precision of its measurement, just must calibrate, and namely demarcates the quantitative relationship of these spectrometer measurement output data and target optical spectrum radiation intensity.The useful load of satellite remote sensing is carried out first the calibration of ground experiment chamber after finishing development, obtain basic calibration data.The calibration of imaging spectrometer comprises the absolute calibration of spectral calibration, relative flat field calibration and spectral radiant emittance, and spectral calibration is to demarcate the Main Means that it interferes performance parameter, is primary calibration.Need carry out calibrating at the rail star after the satellite lift-off, so that the variation of useful load in the monitor satellite emission, operational process, therefore need on the design star scaling system to finish this work.
Will insert scaling system on the star of dependable performance, perfect in shape and function in the main system of spectrometer, difficulty is very large.For example introduce the method for scaling light source on the star from preset lens or main system the place ahead, need add motion pendulum mirror and the complicated imaging system of design, have the problems such as difficulty is large, risk is high, structural volume is large.The spatially modulated interference imaging spectrometer that China's environmental satellite carries has adopted the method for introducing scaling light source by the pendulum mirror, just has the problem that structural volume is large, application risk is high.In addition, have not yet to see the report that designs scaling system on the star both at home and abroad about similar inteference imaging spectrometer.
Summary of the invention
The utility model proposes the star polishing wax scaling system of a space-time unite interferometric modulator imaging spectrometer, solved in the background technology technical matters that the scaling system difficulty is large, risk is high, structural volume is large on time and space combined modulation inteference imaging spectrometer design star.
The technical solution of the utility model is:
The star polishing wax calibrating method of space-time unite interferometric modulator imaging spectrometer, its special character is: may further comprise the steps:
(1) radiant light of calibration lamp is penetrated by the integrating sphere outlet after sparing light through integrating sphere;
(2) uniform light of integrating sphere outlet ejaculation forms the calibration light with spectral signature absorption peak through spectrum glass;
(3) calibration light reflexes on the image planes of inteference imaging spectrometer through reflecting prism, and calibrates the visual field on the visual field, edge of the image planes of the throwing light on formation star, and the calibration visual field is the full visual field of spectrum dimension x direction, dimension y direction edge, space local field of view on the star;
Calibration light is calibrated interferogram successively by shearing interferometer and Fourier imaging lens in the inteference imaging spectrometer at the secondary image planes formation star of inteference imaging spectrometer on the star of (4) image planes visual fields;
(5) calibration interferogram on the star that forms on the secondary image planes is obtained calibration recovery spectrum on the star by spectrum recovering software;
(6) spectrum is restored in calibration on calibration recovery spectrum and the basic star on the star and compare, the variation realization relative spectral calibration according to the characteristic absorption peak position is specially:
When the characteristic absorption peak invariant position, imaging spectrometer interferes performance not have change;
When the characteristic absorption peak change in location, according to direction and the drift value of characteristic absorption peak drift, revise the interferometric parameter d/f of inteference imaging spectrometer
Rich, carry out spectral calibration.
The second reflecting surface of above-mentioned reflecting prism is positioned at the place ahead of calibration visual field on the star of image planes.
Above-mentioned spectral signature absorption peak has a plurality of characteristic peaks.
The star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer, its special character is: comprise integrating sphere, be arranged at the integrating sphere porch the calibration lamp, be arranged at spectrum glass and the reflecting prism of integrating sphere outlet, described reflecting prism will reflex to through the light of spectrum glass on the star of image planes and calibrate the visual field.
Above-mentioned calibration lamp is two, and one as portable lamp, and another is as the backup lamp.
The material of above-mentioned integrating sphere is teflon, and interior sphere diameter is 35mm.
The thickness of above-mentioned reflecting prism is 4-7mm.
The second reflecting surface of above-mentioned reflecting prism is positioned at the place ahead of calibration visual field on the star of image planes.
The utlity model has following advantage:
(1) scaling system is introduced scaling light source in the local field of view of image planes on this star, interferometer by the back, Fourier imaging lens form on the star calibrates interferogram, it restores the interference pattern that spectrum can fully reflect spectrometer, the calibration of star polishing wax is achieved, adds the risk of motion pendulum mirror and the disadvantage of huge structure when having avoided again simultaneously from main system the place ahead introducing scaling light source.
(2) the edge local field of view of image planes of main system is introduced with scaling light source in the edge that scaling system utilizes a thin reflecting prism that thickness is little and axial space is little on this star, realizes the star polishing wax calibration of local field of view, and compact conformation.System architecture is simple, and the axial space that takies optical system is little.
(3) though scaling system is the calibration of local field of view on this star, calibration interferogram and restore the interference performance that spectrum can reflect spectrometer fully on the star of local field of view is feasible to the spectral calibration of imaging spectrometer.
(4) scaling light source Multi reflection in integrating sphere becomes uniform light, on image planes, can obtain visual field direction light intensity star even, that spectrum is consistent and calibrate interferogram, therefore scaling system need not imaging and pushes away and sweep on the star, the calibration interferogram need not splice on the star, directly extract the interferogram of calibration view field space dimension pixel, can directly restore and calibrate spectrum on the star.
(5) active and standby part of part of calibration lamp is installed in two entrances of same integrating sphere, compact conformation.
(6) the spectrum glass material of integrating sphere outlet installation has the characteristic absorption peak transmitted spectrum, make scaling light source through after plane system produce the calibration interferogram with characteristic spectrum, again through the spectrum recovering software rejuvenation, obtain having on the star of characteristic absorption peak and calibrate spectrum, can realize the calibration of star polishing wax according to variation and the comparison of characteristic peak positions.
Description of drawings
Fig. 1: scaling system figure on the star;
Fig. 2: an image planes visual field;
The drawing reference numeral explanation: 1-spectrum glass, 2-calibrates lamp, the 3-integrating sphere, the 4-reflecting prism, image planes of 5-, the visual field is calibrated on the 7-star in image planes visual field of 6-, x-spectrum dimension direction, y-space dimension direction.
Embodiment
Inteference imaging spectrometer comprises the image planes, interferometer, imaging lens, the secondary image planes that distribute successively along light path, and interferometer is preferably shearing interferometer, and imaging lens is preferably the Fourier imaging lens.
The star polishing wax calibrating method of space-time unite interferometric modulator imaging spectrometer may further comprise the steps:
(1) radiant light of calibration lamp 2 is penetrated by integrating sphere 3 outlets after sparing light through integrating sphere 3;
(2) uniform light of integrating sphere 3 outlet ejaculations forms the calibration light with spectral signature absorption peak through spectrum glass 1; The spectral signature absorption peak has a plurality of characteristic peaks, but only need observe a characteristic peak the most effective.
(3) calibration light reflexes on the image planes 5 of inteference imaging spectrometer through reflecting prism 4, and the visual field, edge of the image planes 5 of throwing light on forms calibration visual field 7 on the star, calibration visual field 7 is the full visual field of spectrum dimension x direction, dimension y direction edge, space local field of view on the star, generally only takies the pixel of 10 left and right sides quantity;
Calibration light is calibrated interferogram successively by shearing interferometer and Fourier imaging lens in the inteference imaging spectrometer at the secondary image planes formation star of inteference imaging spectrometer on the star of (4) image planes visual fields 6;
(5) calibration interferogram on the star that forms on the secondary image planes is obtained calibration recovery spectrum on the star by spectrum recovering software;
(6) spectrum is restored in calibration on calibration recovery spectrum and the basic star on the star and compare, the variation realization relative spectral calibration according to the characteristic absorption peak position is specially:
When the characteristic absorption peak invariant position, show that imaging spectrometer interference performance there is not change, need not to revise;
When the characteristic absorption peak change in location, show imaging spectrometer interference performance change, according to direction and the drift value of characteristic absorption peak drift, revise the interferometric parameter d/f of inteference imaging spectrometer
Rich, finish spectral calibration.
The star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer, comprise integrating sphere 3, be arranged at integrating sphere 3 porch calibration lamp 2, be arranged at spectrum glass 1 and the reflecting prism 4 of integrating sphere 3 outlet.
Reflecting prism 4 is thin reflecting prisms that thickness is little and axial space is little, and its thickness is 4-7mm, and to guarantee reflecting prism semi-finals degree and rigidity, reflecting prism 4 is too thin, and is frangible, inconvenience is installed, poor stability; Reflecting prism 4 is too thick, takies system space.The first reflecting surface of reflecting prism 4 is positioned at the place ahead of integrating sphere 3 outlet, and the second reflecting surface of reflecting prism 4 is positioned at the place ahead of calibration visual field 7 on the star of image planes.This entire system is simple in structure, and the axial space that takies optical system is little.
Claims (5)
1. the star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer, it is characterized in that: comprise integrating sphere, be arranged at the integrating sphere porch the calibration lamp, be arranged at spectrum glass and the reflecting prism of integrating sphere outlet, described reflecting prism will reflex to through the light of spectrum glass on the star of image planes and calibrate the visual field, and the calibration visual field is the full visual field of spectrum dimension x direction, dimension y direction edge, space local field of view on the described star.
2. the star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer according to claim 1 is characterized in that: the second reflecting surface of reflecting prism is positioned at the place ahead of calibration visual field on the star of image planes.
3. the star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer according to claim 1 and 2, it is characterized in that: described calibration lamp is two.
4. the star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer according to claim 3, it is characterized in that: the material of described integrating sphere is teflon, interior sphere diameter is 35mm.
5. the star polishing wax scaling system of space-time unite interferometric modulator imaging spectrometer according to claim 4, it is characterized in that: the thickness of reflecting prism is 4-7mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220437939.0U CN202837540U (en) | 2012-08-30 | 2012-08-30 | Onboard spectral calibration system of space-time combined modulation interference imaging spectrometer |
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| CN201220437939.0U CN202837540U (en) | 2012-08-30 | 2012-08-30 | Onboard spectral calibration system of space-time combined modulation interference imaging spectrometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841342A (en) * | 2012-08-30 | 2012-12-26 | 中国科学院西安光学精密机械研究所 | Space-borne spectral calibration method and system of spatio-temporal modulated interference imaging spectrometer |
| CN110960234A (en) * | 2018-09-28 | 2020-04-07 | 通用电气公司 | System and method for calibrating an imaging system |
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2012
- 2012-08-30 CN CN201220437939.0U patent/CN202837540U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841342A (en) * | 2012-08-30 | 2012-12-26 | 中国科学院西安光学精密机械研究所 | Space-borne spectral calibration method and system of spatio-temporal modulated interference imaging spectrometer |
| CN110960234A (en) * | 2018-09-28 | 2020-04-07 | 通用电气公司 | System and method for calibrating an imaging system |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
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| CX01 | Expiry of patent term |