Differential absorption spectrometer optical system based on geosynchronous orbit observation

Abstract

The invention discloses a differential absorption spectrometer optical system based on geosynchronous orbit observation. The differential absorption spectrometer optical system comprises a scanning mirror system, a front telescopic imaging system and an Offner spectral imaging system, wherein the scanning mirror system comprises a scanning mirror, the front telescopic imaging system comprises a primary mirror, a secondary mirror and a third reflecting mirror, an aperture diaphragm is arranged at the front end of the secondary mirror, the Offner spectral imaging system comprises an entrance slit, an optical filter, a depolarizer, a first concave reflector, a convex grating, a second concave reflector and an area array detector, the scanning mirror introduces sky-bottom information detected based on a geosynchronous orbit into the front telescopic imaging system through scanning and focuses the sky-bottom information to the entrance slit, and spectral information of a detected target object is reflected to the first concave reflector by the Offner spectral imaging system after light filtering, depolarization and turning, then is split to the second concave reflector by the convex grating, and finally is focused on the area array detector, so that high-spectral and spatial-resolution detection is completed.

Description

technical field [0001] The invention belongs to the field of optical measurement methods, specifically based on the geosynchronous orbit, through high-resolution spectral imaging to obtain the scattering spectrum of the nadir observation, and invert the atmospheric trace gas components in the observed area such as NO 2 , SO 2 , O 3 Vertical column concentration profile of the iso-substance. It is mainly used in the detection of atmospheric trace gases based on geosynchronous orbit satellite platforms in the aerospace field. The optical system is composed of three parts: scanning mirror system, front telescopic imaging system and Offner spectral imaging system. Background technique [0002] The root cause of the impact on the atmospheric environment is the emission of pollutants, and the process of weather changes plays an important role in the evolution of the pollution process. Accurate air quality forecasts rely on the accuracy of weather forecasts and the precise quant...

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Problems solved by technology

The problem in the current monitoring is that the main means of monitoring pollutants is conventional ground-based observation or ground-based telemetry, which cannot meet the needs of air quality forecasting and understanding the trans-regional transport process of pollutants

At present, my country's on-board payloads used in the inversion of atmospheric parameters are mainly on the Fengyun series satellites. Space-borne monitoring of trace gases using the ultraviolet-visible light band has just started, and there is no space-borne instrument that can simultaneously target multiple polluting gases in the troposphere. monitoring

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