Differential absorption imaging spectrometer optical system based on limb observation

An optical system and imaging system technology, applied in the field of optical measurement, can solve the problems of small field of view of the imaging spectrometer system, fewer detection channels in the ultraviolet band, and large volume of the optical system, achieving good resolution and contrast, and high utilization efficiency of radiation energy , High image quality effect

CN111208074APending Publication Date: 2020-05-29HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-05-29

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Abstract

The invention discloses a differential absorption imaging spectrometer optical system based on limb observation. The differential absorption imaging spectrometer optical system comprises a swing scanning mirror system, an off-axis three-mirror telescopic imaging system and an Offner-Littrow spectral imaging system. The swing scanning mirror system is composed of a swing mirror. The off-axis three-mirror telescopic imaging system is mainly composed of an off-axis three-mirror telescope and comprises an aperture diaphragm, a depolarizer and a color separation film. The Offner-Littrow spectral imaging system is specifically composed of an entrance slit, a detector, a convex grating, a concave reflector and an aberration correction lens. The swing mirror introduces detected limb information into the off-axis three-mirror telescopic imaging system through scanning to divide into three independent spectrum channels through the color separation film, and the three independent spectrum channels are respectively focused to the entrance slit of the Offner-Littrow spectrum imaging system. Corresponding spectral information is collimated by the aberration correction lens to be reflected by theconcave reflector and is split to the concave reflector by the convex grating and then is focused to the detector by the aberration correction lens. Measurement accuracy is guaranteed, and the overall optical system is compact in size.
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Description

technical field

[0001] The invention belongs to the field of optical measurement methods, and specifically obtains the scattering spectrum of the limb observation through high-resolution spectral imaging, and inverts the trace gas component NO in the observed area. 2 , O 3 vertical distribution of substances. It is mainly used in spaceborne limb differential absorption spectrometer detection on aerospace satellite platforms. It is composed of three parts: swing mirror, off-axis triple-mirror telescopic imaging system and Offner-Littrow spectral imaging system. Background technique

[0002] The system of the present invention detects the atmosphere in the tangential direction of the earth, collects the scattered radiation of atmospheric trace gas within the field of view of the instrument, the brightness of the scattered radiation changes with the wavelength and the height of the limb, and by analyzing the spectral characteristics of the received scattered radiation, Invers...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] like figure 1 , 2 As shown, the optical system of the differential absorption imaging spectrometer based on limb observation includes a swing mirror system, an off-axis three-mirror telescopic imaging system and an Offner-Littrow spectral imaging system; the swing mirror system includes window 1 and swing mirror 2; The side information light passes through the window 1, scans through the swing mirror 2, and enters the subsequent off-axis triple-mirror telescopic imaging system. The off-axis triple mirror telephoto imaging system specifically includes: a primary mirror 4 , an aperture stop 5 , a secondary mirror 6 and a third mirror 7 , and a depolarizer 3 is added at the front end of the primary mirror. There are two dichroic filters at the rear end of the third reflecting mirror 7 , that is, a first dichroic filter 8 and a second dich...