CN2446503Y - High-sensitivity interference imaging spectrum device - Google Patents
High-sensitivity interference imaging spectrum device Download PDFInfo
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- CN2446503Y CN2446503Y CN 99256131 CN99256131U CN2446503Y CN 2446503 Y CN2446503 Y CN 2446503Y CN 99256131 CN99256131 CN 99256131 CN 99256131 U CN99256131 U CN 99256131U CN 2446503 Y CN2446503 Y CN 2446503Y
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- 238000003384 imaging method Methods 0.000 title claims abstract description 32
- 238000001228 spectrum Methods 0.000 title abstract description 4
- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 238000010008 shearing Methods 0.000 claims abstract description 19
- 230000003595 spectral effect Effects 0.000 claims description 21
- 230000035945 sensitivity Effects 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 230000004907 flux Effects 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 4
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- 238000004587 chromatography analysis Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
A high-sensitivity interference imaging spectrum device comprises a front-end optical system, a solid-type lateral shearing interferometer, an imaging mirror optical system, a detector and a signal acquisition and processing system, wherein the solid-type lateral shearing interferometer consists of two glued semi-pentagonal prisms, the semi-pentagonal prisms have a certain angle range, the front-end optical system is arranged at one end of the semi-pentagonal prisms, the imaging mirror optical system is arranged at the other end of the semi-pentagonal prisms, the detector is arranged at the focal plane of the imaging mirror optical system, and the detector is connected with the signal acquisition and processing system. The utility model discloses simple structure, high energy flux, multispectral passageway, high SNR, high stability collect time modulation and space modulation formula advantage in an organic whole.
Description
The utility model relates to a kind of high sensitivity inteference imaging spectral apparatus.Be applicable to that land resource is reconnoitred, environmental monitoring, ocean resources generaI investigation, disaster monitoring and evaluation, uranology research, atmospheric exploration and obtain the abundant information of the space peacekeeping spectrum dimension of measured target, can be to the imaging simultaneously of same target on the continuous light spectral coverage.
Imaging spectrometer mainly contains three types at present.A kind of is color dispersion-type, and color dispersion-type has been in the application stage, and its feature is simple in structure, stable performance, but capacity usage ratio is low; Another kind is an interfere type, interfere type has advantages such as high energy flux, multispectral passage and high spectral resolution, but the contradiction (be that the high instrument of flux has poor stability, can reduce flux of energy) that has stability and flux of energy simultaneously again and improve stability; A kind of be the chromatography type, the chromatography type has space and spectrum dimension hyperchannel advantage and variable resolution advantage, but to the undue dependence of big planar array detector, has limited its practicality again.
The interference imaging spectral technology that has occurred mainly contains two kinds, a kind of time modulation system (dynamically) that is based on Michelson interferometer, and another kind is based on the spatial modulation formula (static state) of lateral shearing interferometer.With them is that many kinds of inteference imaging spectrometers have appearred in the basis, the U.S., Japan, the multinational inteference imaging spectrometer that is used for Aero-Space remote sensing of all having succeeded in developing in succession in Europe.But there is certain defective separately in they: as time modulation system flux height, signal to noise ratio (S/N ratio) height, spectral resolution height, but the accuracy requirement of index glass scanning mechanism is very high, and the ray machine poor stability is unsuitable for rugged surroundings such as Aero-Space; Spatial modulation formula stability is high, real-time is good, simple in structure, has the high flux advantage under given conditions, but more often similar to color dispersion-type imaging spectrometer flux of energy, therefore, the sensitivity and the spatial resolution of instrument are very restricted.
Defective at above-mentioned existence, the purpose of this utility model has been to provide a kind of high energy flux, multispectral passage, high s/n ratio, high stability, inteference imaging spectrometer simple in structure, and the high sensitivity that promptly integrates time modulation system and spatial modulation formula major advantage is in relating to the imaging spectral device.
In order to achieve the above object, the utility model adopts following technical measures: high sensitivity inteference imaging spectral apparatus is obtained with disposal system by preposition optical system, solid type lateral shearing interferometer, imaging mirror optical system, detector and signal to be formed.The design of high sensitivity inteference imaging spectral apparatus is: place preposition optical system at solid type lateral shearing interferometer one end, the other end is placed to picture mirror optical system, the radiation that target is sent necessarily enters the solid type lateral shearing interferometer for collimated light after preposition optical system, the effect of solid type lateral shearing interferometer is a light that enters to be become two coherent lights parallel to each other incide the imaging mirror system, place detector at the focal plane place of imaging mirror system then, obtain the picture of streaky target, detector becomes electric signal to light signal, detector obtains with disposal system with signal and links to each other, through signal obtain with disposal system after just can obtain the image information and the spectral information of target simultaneously.
Fig. 1 is a high sensitivity inteference imaging spectral apparatus synoptic diagram.
Fig. 2 is half pentagonal prism synoptic diagram.
Below in conjunction with accompanying drawing the utility model is described in further detail:
According to Fig. 1, Fig. 2 as can be known, solid type lateral shearing interferometer (2) one ends are placed preposition optical system 1, preposition optical system 1 is made of pre-objective a, field stop c and collimating mirror b, and pre-objective a and collimating mirror b can adopt refraction type, refraction-reflection or total-reflection type.The radiation that target is sent through pre-objective at first become once as, these image planes are called image planes one time, field stop c just is placed on focal plane, the front focal plane of collimating mirror b must be on image planes.The effect of preposition optical system 1 has three: the one, and collimating effect, promptly the light from preposition optical system outgoing must be collimated light; The 2nd, adjust the luminous energy receive, if weak radiation target, adjust the inner parameter of preposition optical system 1 after, can increase several times so that enter the energy of optical system; The 3rd, suppress parasitic light, this effect is to realize by the field stop c that is placed on the intermediate image plane.Solid type lateral shearing interferometer 2 is made up of the half pentagonal prism d and the e of two gummeds, and wherein one and half pentagonal prisms plate semi-transparent semi-reflecting film, and the shape of this two and half pentagonal prism is similar, and each corresponding angle equates respectively.The structural representation of half pentagonal prism as shown in Figure 2, wherein all angles have multiple choices can realize the function of lateral shear.The angular range of half pentagonal prism is: angle 1 between 40 °～60 °, angle 2 between 100 °～120 °, angle 3 between 110 °～130 °, angle 4 between 80 °～100 °, more convenient gummed when angle 4 is got 90 °.The effect of solid type lateral shearing interferometer 2 be can will enter the light of solid type lateral shearing interferometer 2 cut into parallel fully and two coherent rays of certain distance (shearing displacement) arranged.Solid type lateral shearing interferometer 2 other ends are placed to picture mirror optical system 3, target emanation after imaging mirror optical system 3 will be sheared is collected on the detector 4 that is positioned at its image planes, radiation is in interfere herein, the interference fringe direction is vertical with the shear direction of shearing interferometer, the interference light path difference is directly proportional with shearing displacement, detector effective dimensions, is inversely proportional to collection optical system focal length.Optical path difference is big more, and spectral resolution is high more.The effect of imaging mirror optical system 3 is exactly imaging.Detector 4 is placed at the place in the focal plane of imaging mirror optical system 3, and detector 4 is receivers of interference signal, and instrument can use planar array detector, when pushing away the mode of sweeping and work, can obtain the two-dimensional space and the one dimension spectral information of target.Detector 4 obtains with signal and disposal system 5 links to each other, and signal obtains and disposal system 5 is carried out digitizing to the interferogram signal of obtaining from detector, sends in the processor and handles, and finally obtains the spectral information and the image information of target.The optical axis of preposition optical system 1 must be vertical and a plane of first half pentagonal prism of lateral shearing interferometer, and the optical axis of imaging mirror optical system 3 also must be perpendicular to the corresponding flat of another piece half pentagonal prism.
The high sensitivity inteference imaging spectrometer is a kind of imaging spectrometer of brand-new principle, and switching except that calibration needs the motion, does not have any mechanical motion, has the characteristics of high stability.Spectrometer adopts Sagnac type cube lateral shearing interferometer, utilizes divided two-beam along essentially identical light path backpropagation, and is therefore less demanding to interferometer itself, but need guarantee the position and the angular relationship of two-face mirror on structural design.Structural design will guarantee the optical system requirement.Electric system is partly formed mainly due to relating to Image Acquisition, central control unit, picture frame storage, compression of images, calibration control and signal Processing etc., extensive field programmable gate array chip (FPGA) is adopted in the design of circuit, and the precision and the reliability of system are improved widely.Detector is the receiver of interference signal, and instrument is when pushing away the mode of sweeping (push-broom, a kind of typical working method) work, and linear array detector can obtain the one-dimensional space and the one dimension spectral information of target; Planar array detector can obtain the two-dimensional space and the one dimension spectral information of target.Signal Processing is with its digitized interferogram signal, sends in the processor (as computing machine) and handles, and finally obtains the HYPERSPECTRAL IMAGERY of target.The major function of scaling system is that the spectral response of whole instrument system and radiancy response are demarcated, and the branch of spectral responsivity calibration, radiancy calibration and relative calibration and absolute calibration is arranged.
It is a kind of high sensitivity inteference imaging spectral apparatus that integrates the advantage of time modulation system and spatial modulation formula.
Claims (2)
1, a kind of high sensitivity inteference imaging spectral apparatus, it is made of solid type lateral shearing interferometer (2), imaging mirror optical system (3), detector (4), it is characterized in that solid type lateral shearing interferometer (2) forms by half pentagonal prism (d) of two gummeds with (e), wherein one and half pentagonal prisms plate semi-transparent semi-reflecting film.
2, according to claims 1 described a kind of high sensitivity imaging spectral device, it is characterized in that the angular range of half pentagonal prism, angle 1 is at 40 °～60 °, and angle 2 is at 100 °～120 °, and angle 3 is at 110 °～130 °, and angle 4 is at 80 °～100 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99256131 CN2446503Y (en) | 1999-12-28 | 1999-12-28 | High-sensitivity interference imaging spectrum device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99256131 CN2446503Y (en) | 1999-12-28 | 1999-12-28 | High-sensitivity interference imaging spectrum device |
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| CN2446503Y true CN2446503Y (en) | 2001-09-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455985C (en) * | 2007-09-03 | 2009-01-28 | 中国科学院西安光学精密机械研究所 | Gluing detection method of lateral shearing interferometer |
| CN102322954A (en) * | 2011-08-15 | 2012-01-18 | 苏州大学 | Hyper-spectral compression imaging method and system thereof |
| CN105067119A (en) * | 2015-08-21 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | Field-of-view segmentation interference imaging spectrometer and imaging method |
| CN107796302A (en) * | 2017-10-16 | 2018-03-13 | 西安交通大学 | A kind of dual-purpose type telecentric structure digital holographic micro-measuring device based on optical fiber |
| CN110488506A (en) * | 2019-08-28 | 2019-11-22 | 中国人民解放军国防科技大学 | A kind of Automatic laser collimation adjustment device and method |
-
1999
- 1999-12-28 CN CN 99256131 patent/CN2446503Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100455985C (en) * | 2007-09-03 | 2009-01-28 | 中国科学院西安光学精密机械研究所 | Gluing detection method of lateral shearing interferometer |
| CN102322954A (en) * | 2011-08-15 | 2012-01-18 | 苏州大学 | Hyper-spectral compression imaging method and system thereof |
| CN105067119A (en) * | 2015-08-21 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | Field-of-view segmentation interference imaging spectrometer and imaging method |
| CN107796302A (en) * | 2017-10-16 | 2018-03-13 | 西安交通大学 | A kind of dual-purpose type telecentric structure digital holographic micro-measuring device based on optical fiber |
| CN110488506A (en) * | 2019-08-28 | 2019-11-22 | 中国人民解放军国防科技大学 | A kind of Automatic laser collimation adjustment device and method |
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