Compact differential interferometry imaging spectrograph and imaging method thereof

Abstract

The invention relates to a compact differential interferometry imaging spectrograph and an imaging method thereof. The spectrograph comprises a telescoping system, a filter, a low-chromatic-dispersionmodule, a high-chromatic-dispersion module, a polarization analyzer and a detector, wherein the telescoping system, the filter, the low-chromatic-dispersion module, the high-chromatic-dispersion module, the polarization analyzer and the detector are arranged along a light path; the low-chromatic-dispersion module and the high-chromatic-dispersion module independently comprise a polarizing beam splitting prism, a 1/4 wave plate, a view field expanding prism, a blazed grating, a 1/4 wave plate, a view field expanding prism and a blazed grating, wherein the 1/4 wave plate, the view field expanding prism and the blazed grating are arranged in a transmission light path of the polarizing beam splitting prism in sequence, and the 1/4 wave plate, the view field expanding prism and the blazed grating are arranged in the reflecting light path of the polarizing beam splitting prism in sequence; the telescoping system is used for collecting the spectral radiance of an observation target; the filter is used for filtering the collected spectral radiance of the observation target; the low-chromatic-dispersion module is used for carrying out light splitting on filtered rays; the high-chromatic-dispersion module is used for gathering and emitting the rays; the polarization analyzer is used for carrying out beam combination on emergent light; and the detector is used for receiving an interference image emitted from the polarization analyzer and carrying out imaging on the spectral radiance collected by the telescoping system. The spectrograph is applied to atmospheric composition detection,and atmospheric compositions can be obtained through obtained spectrum information.

Description

technical field [0001] The invention relates to a compact differential interference imaging spectrometer and an imaging method thereof. Background technique [0002] In 2013, John M.Harlander proposed the concept of a real fringe Doppler asymmetric space heterodyne interferometer (HARLANDER J M,ENGLERTC R.Design of a real-fringe DASH interferometer for observations of thermospheric winds from a small satellite[C].FourierTransform Spectroscopy.Optical Society of America,2013:FW1D.2.), and based on the oxygen atom red line (O[ 1 D]630nm) for spaceborne upper atmospheric wind field detection, and give the parameters of the design system and a specific simulation model. In 2015, Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences explained the concept and basic principles of real fringe Doppler asymmetric spatial heterodyne interferometer in detail, (FEI Xiao-yun, FENG Yu-tao, BAI Qing-lan, et al. al..Real-fringe DASH interferometer for upper atmospheric ...

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Problems solved by technology

[0003] All of the above use the real fringe Doppler asymmetric space heterodyne interferometer to detect the space-borne upper atmospheric wind field, which can only realize the detection of atmospheric wind speed. Under certain circumstances, it is necessary to obtain more information about the atmospheric wind field, such as atmospheric composition information, but none of the above papers explicitly proposed that the real fringe Doppler asymmetric spatial heterodyne interferometer has other functions besides detecting atmospheric wind speed

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