Optical system of large-field wide-band airborne differential absorption imaging spectrometer

Abstract

The invention discloses an optical system of a large-field wide-band airborne differential absorption imaging spectrometer, which comprises a front telescopic imaging system and an Offner-Littrow spectral imaging system, wherein the front telescopic imaging system mainly comprises a front ultraviolet objective lens; the Offner-Littrow spectral imaging system specifically comprises an optical filter, an incident slit, a convex grating and a concave reflector; the front ultraviolet objective lens consists of three independent front lenses according to detection wavebands (200-276 nm, 276-380 nm,380-500 nm), and the field of view of each lens reaches 40 degree. The Offner-Littrow spectral imaging system is also independently composed of three spectrometers according to the above wavebands. Each waveband light is focused from a front lens and enters the incident slit of the spectrometer, three groups of spectra to be detected enter the spectrometer through the optical filter at the rear end of the incident slit of the spectrometer, the corresponding spectral information is reflected by the concave reflector and then is split by the convex grating, and the light path is turned to the concave reflector and then focused on a detector. According to the optical system of the large-field wide-band airborne differential absorption imaging spectrometer, the measurement accuracy is ensured, and the whole optical system is compact in size.

Description

technical field [0001] The invention belongs to the field of optical measurement methods, in particular to an optical system of an airborne differential absorption imaging spectrometer that collects and gathers ultraviolet and visible scattered light from the ground surface and sky, and is mainly used in the detection of differential absorption spectrometers on aviation airborne platforms. It consists of two parts: the front telescopic imaging system and the spectral imaging system. Background technique [0002] Ultraviolet hyperspectral airborne imaging spectrometer analyzes the trace pollution gas component NO by detecting the reflected and scattered ultraviolet radiation on the ground surface 2 , SO 2 , O 3 The distribution and change of etc., the optical system detects the spectral range from 200nm to 500nm, and the field of view is 40°. The technical solution of imaging spectrometer must make comprehensive engineering trade-offs in terms of application requirements, ...

AI Technical Summary

Problems solved by technology

And effectively combine the multi-channel import optical system with the Offner-Littrow spectrometer to realize the wide-spectrum detection technology of the ultraviolet channel and the visible light channel, and solve the problem of low spectral resolution and spatial resolution of the airborne imaging spectrometer and ultraviolet band detection. There are few channels, the field of view of the imaging spectrometer system is too small, the overall volume of the optical system is too large, and the weight is too heavy, etc.

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