Broad-band hyperspectral resolution imaging system for ground-based lunar observations
An imaging system and wide-band technology, which is applied in the field of imaging spectroscopy and radiation calibration, can solve the problems of discontinuous observation spectrum, low spectral resolution, and small number of spectral segments, so as to improve detection sensitivity, signal-to-noise ratio, hyperspectral The effect of resolution and bandwidth
Active Publication Date: 2017-09-12
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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[0004] In order to solve the problems of the existing ground-based lunar observation system using a filter type spectral imager, such as narrow band, small number of spectral segments, discontinuous observation spectrum, and low spectral resolution, the present invention proposes a ground-based lunar observation system. Broadband Hyperspectral Resolution Imaging System
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[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0038] Such as figure 1 As shown, the wide-band high-spectral resolution imaging system for ground-based observation of the moon of the present invention mainly includes a coaxial double-mirror telescope, a visible-near-infrared (VNIR) spectral imaging system and an infrared (IR) spectral imaging system.
[0039] Said coaxial double mirror telescope is made up of primary mirror 1 and secondary mirror 2. Quadric coefficient K of primary mirror 1 1 Satisfy: -1≤K 1 ≤-1.5,K 1 The best value is -1.05; the quadratic surface coefficient K of the secondary mirror 2 2 Satisfy: -1.5≤K 2 ≤-5,K 2 The best value is -3.61; the blocking ratio of the secondary mirror 2 to the primary mirror 1 is less than 30%.
[0040] The zoom ratio β of the visible-near-infrared spectral imaging system 1 Satisfy: 0.98≤β 1 ≤1.02. The visible near-infrared spectrum imaging system con...
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The wide-band high-spectral resolution imaging system for ground-based lunar observations involves the fields of imaging spectrum technology and radiometric calibration, and solves the problems of narrow bands and wide spectrum in existing ground-based lunar observation systems that use filter-type spectral imagers. The number of segments is small, the observed spectrum is discontinuous, and the spectral resolution is low. The system includes primary mirror, secondary mirror, entrance slit, wedge dichroic filter, first VNIR mirror, VNIR convex grating, second VNIR mirror, VNIR plane turning mirror, VNIR order selection filter, VNIR focal plane Detector, first IR mirror, IR convex grating, second IR mirror, IR order selection filter and IR focal plane detector. The invention utilizes the movement of the moon relative to the earth to adjust the angle of the turntable to realize wide-band and high-resolution scanning observation of the entire lunar disk. The invention utilizes wedge-shaped color separation sheets to realize simultaneous detection of visible and near-infrared bands and infrared bands, has wide band, increased number of spectral segments, continuous observation spectrum, and high spectral resolution and spectral purity.
Description
technical field [0001] The invention relates to the fields of imaging spectrum technology and radiation calibration technology, in particular to a wide-band high-spectral resolution imaging system for ground-based observation of the moon. Background technique [0002] Quantitative remote sensing is the key direction for the development of remote sensing fields such as atmosphere and ocean. The calibration of space remote sensors is the premise of the quantification of remote sensing information. The reliability of remote sensing data and the depth and breadth of applications depend to a large extent on the calibration accuracy of remote sensors. At the same time, the calibrated data does not depend on the data of the remote sensor, and its radiation value still maintains the physical information of the target structure and composition. If a natural star with known radiation properties is available, it is a very valuable calibration source. The moon is the only natural star...
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IPC IPC(8): G01J3/28
Inventor 薛庆生王淑荣
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI