Wide-spectrum spatial heterodyne spectrometer

Abstract

The invention discloses a wide-spectrum spatial heterodyne spectrometer, which overcomes the defect that the conventional spatial heterodyne spectrometer has a narrow spectrum in the prior art. A blazed grating component consists of a first echelle grating and a second echelle grating which are respectively positioned on a reflection light path and a transmission light path formed by a beam splitting element for the first time; an angle relationship and a position relationship between the two echelle gratings are that: (1) a reflection beam and a transmission beam which are split by the beam splitting element for the first time are transmitted to the two echelle gratings at a Littrow angle; and (2) by taking the conventional position relationship between the blazed grating component and the beam splitting element as the standard, the first echelle grating rotates alpha / 4 degrees around a first rotating shaft, and the second echelle grating rotates -alpha / 4 degrees around a second rotating shaft; and a controllable optical shutter serving as a hierarchy selection mask is arranged at a superposed position of focal planes of a fringe imaging system. The wide-spectrum spatial heterodyne spectrometer has the advantages of high stability, high spectral resolution and wide-spectrum coverage, and is very suitable for satellite-borne spatial environment remote sensing and atmospheric sounding.

Description

technical field [0001] The invention relates to a wide-band spatial heterodyne spectrometer. Background technique [0002] 1. Mathematical expression of the basic principle of spatial heterodyne spectrometer [0003] The radiation passing through the entrance pupil of the interferometer is collimated and turned into a plane wave, which is split by the beam splitter at the Littrow angle θ L incident on two gratings. According to the grating equation [0004] σ(sinθ L +sinβ)=mD, (1) [0005] σ is the wave number, θ L is the beam incident angle, β is the beam exit angle, m is the diffraction order, and D is the groove density of the grating. Then light with different wave numbers σ exits the grating at different diffraction angles β, and there will be a certain wave number σ in the diffracted outgoing beam 0 The light returns according to the original incident light path, that is, corresponding to β(σ 0 ) = θ L , corresponding to the outgoing wavefronts of the two grat...

AI Technical Summary

Problems solved by technology

[0013] The invention provides a wide-spectrum spatial heterodyne spectrometer, which overcomes the defect that the traditional spatial heterodyne spectrometer in the prior art has a very narrow spectrum

Images