Optical system of large-view-field high-resolution earth observation ultraviolet imaging spectrometer

Abstract

The invention discloses an optical system of a large-view-field high-resolution earth observation ultraviolet imaging spectrometer. The optical system comprises a front telescopic imaging system and an Offner-Littrow spectral imaging system. The front telescopic imaging system comprises a concave reflector, a turning mirror, a primary mirror, a secondary mirror, a color separation film, a depolarizer and a diaphragm. The Offner-Littrow spectral imaging system is specifically composed of an optical filter, an entrance slit, a detector, a convex grating, a concave reflector and an aberration correction lens. The concave reflector introduces optical information observed to the ground into the instrument, the optical information is focused by the primary mirror and the secondary mirror after passing through the turning mirror and the depolarizer, and two independent spectrum channels (300nm-400nm) and (395nm-500nm) are formed through the color separation film for detection. Light of each wave band is respectively focused on the entrance slit of the spectrometer and passes through the optical filter and is collimated to the concave reflector by the aberration correction lens and is split and reflected to the concave reflector by the convex grating and is focused on 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. The instrument analyzes the trace pollution gas component NO by detecting the ultraviolet / visible light radiation reflected and scattered by the earth's atmosphere or the surface. 2 , SO 2 , O 3 distribution and changes. Specifically, it consists of two parts: the front telescopic imaging system and the Offner-Littrow spectral imaging system, and is mainly used in the detection of high-resolution imaging spectrometers on spaceborne or airborne platforms. Background technique [0002] The present invention is mainly used for quantitatively monitoring global / area trace pollution gas composition (O 3 , NO 2 , HCHO and SO 2 etc.), obtain high-spectral and high-spatial-resolution horizontal distributions of atmospheric trace gases, monitor changes in air quality over my country and around the world and the distribution and transportation of polluted gases, and analyze the impact of huma...

AI Technical Summary

Problems solved by technology

[0005] The resolution requirements of the earth observation ultraviolet imaging spectrometer are high, and the focal length of the optical system will be long. If an optical system with a relatively large aperture is used to meet the required radiation energy, the volume and weight of the instrument will increase a lot, which may exceed the capacity of satellite resources. scope

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