Combined space-time modulation Fourier transform infrared imaging spectrometer

Abstract

The invention provides a spatio-temporal union modulation Fourier transform infrared imaging spectrograph, and relates to the field of earth observation imaging spectrographs. The spatio-temporal union modulation Fourier transform infrared imaging spectrograph resolves the problems that an existing imaging spectrograph contains a slit related to the spatial resolution, luminous flux entering a system is limited, and real-time performance is poor. The spatio-temporal union modulation Fourier transform infrared imaging spectrograph comprises a front optical imaging system, an interference system, a rear imaging beam reducing system and a focal plane detector, and the interference system comprises a plane mirror, a cube beam splitter and a multi-level step micro-mirror; a target light beam enters the cube beam splitter through the front optical imaging system and is divided into two light beam bodies, one light beam body is reflected to the plane mirror through the cube beam splitter to form a first image point in an imaging mode, and the other light beam body is transmitted to a certain step surface of the multi-level step micro-mirror to form a second image point in an imaging mode; light emitted by the first light point and light emitted by the second light point enter the rear imaging beam reducing system for imaging after being transmitted and reflected by the cube beam splitter, and the focal plane detector receives imaging information. The spatio-temporal union modulation Fourier transform infrared imaging spectrograph greatly improves the luminous flux of the system.

Description

technical field [0001] The invention relates to the field of imaging spectrometers for earth observation, in particular to a novel space-time combined modulation infrared Fourier transform imaging spectrometer system based on multi-level stepped micro-mirrors. Background technique [0002] Imaging spectrometer is a new generation of optical remote sensing instrument developed on the basis of imaging spectroscopy technology in the 1980s. It can obtain object spectral information and image information, so it is widely used in space remote sensing, military target detection, geological resource exploration, environmental Monitoring, meteorological analysis and other fields. According to different working principles, it is mainly divided into two types: dispersion type and Fourier transform type. The dispersive imaging spectrometer uses a prism or a grating as a spectroscopic element, and receives the radiation information of each spectral element on the detector. Its developm...

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Problems solved by technology

[0003] In order to solve the problem that the existing imaging spectrometer contains slits related to spatial resolution, which limits the luminous flux entering the system and has poor real-time performance, the invention provides a space-time joint modulation Fourier transform imaging spectrometer system

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