Raster imaging spectrometer

Abstract

The invention provides a raster imaging spectrometer which comprises a preposed receiving optics unit, a light split imaging unit comprising an entrance slit, a plane mirror, a collimating-focusing system and a raster, and a spectral signal processing unit comprising an area array photoelectric detector and a signal processing system. The entrance slit is arranged at the focal point of an emergent light ray of the preposed receiving optics unit; the emergent light ray of the preposed receiving optics unit penetrates through the entrance slit to be capable of reaching the reflecting surface of the plane mirror; the collimating-focusing system is arranged on the reflected light ray of the plane mirror and is coaxial with the raster; the reflected light ray of the raster on the plane mirror passes through the collimating-focusing system-collimated emergent light ray; the area array photoelectric detector is positioned at the focal point of the diffracted light ray of the emergent light ray focused by the collimating-focusing system, of the raster; and an output end of the area array photoelectric detector is connected with an input end of the signal processing system. The raster imaging spectrometer provided by the invention has the advantages of being simple in structure, high in stability, high in spectral resolution, small in volume, low in price, capable of planar imaging, etc.

Description

technical field [0001] The invention relates to a grating imaging spectrometer, which is suitable for ground observation in a space-borne or airborne environment, and belongs to the technical field of analytical instruments. Background technique [0002] Imaging spectrometer combines imaging technology and spectral technology, and is a detection and analysis instrument that can obtain multi-dimensional target information. It identifies the type of material and analyzes the state of the target by acquiring the target's spatial information and spectral information. The target space information that it can obtain itself is two-dimensional, and the three-dimensional space information can be obtained by means of scanning technology and space multi-channel detection technology. Since the appearance of imaging spectrometer, it has been widely used in remote sensing fields such as environment, agriculture, forestry, land resources, mineral resources monitoring, etc., and gradually ...

AI Technical Summary

Problems solved by technology

[0004] Most of the current grating imaging spectrometers are OFFNER imaging spectrometers. This structure has the advantages of small aberration and compact structure. In the specific design, an off-axis three-mirror structure is mostly used. The main mirror, grating, and three mirrors of this structure are separated. , can obtain a larger relative aperture, but the processing and adjustment are more difficult; in addition, the OFFNER imaging spectrometer is mostly designed based on the Roland structure, and its imaging surface is a curved surface, while the detectors generally used are flat, which forms a contradiction.

Generally speaking, the existing imaging spectrometers have the disadvantages of non-planar imaging, large volume, and difficult processing and adjustment.

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