Differential absorption imaging spectrometer optical system based on limb observation

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.

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...

AI Technical Summary

Problems solved by technology

And effectively combine the swinging mirror system and off-axis three-mirror telescopic imaging to form multi-channel detection through the color separation plate, and combine the slits with the Offner-Littrow spectrometer of the corresponding spectral channel to achieve wide-spectrum high-resolution The high-rate limb detection technology solves the problems of low vertical spatial resolution of the limb observation imaging spectrometer, fewer detection channels in the ultraviolet band, too small field of view of the imaging spectrometer system, large overall volume and heavy weight of the optical system, etc.

Images