Interference imaging spectroscopy device and method for improving spectral resolution

Abstract

The invention discloses an interference imaging spectroscopy device and an interference imaging spectroscopy method for improving spectral resolution. The device comprises a front optical system, a dispersion flat plate Sagnac lateral shear beam splitting system, an imaging system and a signal processing system which are arranged along an optical path in sequence, wherein incident light of each point of a target enters the front optical system to eliminate stray light and form a collimated light beam; the light beam then enters the dispersion flat plate Sagnac lateral shear beam splitting system; the light is laterally sheared by the lateral shear beam splitting system; because of the flat plate dispersion effect, the shear distance changes along with light wavelength, and further optical path difference information which changes along with wave number is introduced; two beams of light formed by shearing subsequently enter the imaging system; interference information under different optical path differences of each point of the target is acquired by turning the lateral shear beam splitter or the entire system; and discrete fourier transform is performed on the acquired interference information of the target point to obtain high-resolution spectral information and two-dimensional image information of each spectral band are obtained. The device and the method have the advantages of high spectral resolution, high luminous flux, high target resolution and the like.

Description

technical field [0001] The invention belongs to the field of optical detection targets, in particular to a detection method capable of obtaining two-dimensional image information of the target space and high-resolution spectral information of each point of the target. Background technique [0002] Imaging spectroscopy technology uses a combination of radiation imaging technology and spectral measurement technology to obtain the two-dimensional spatial radiation intensity information of the target and the spectral information of each point of the target. Among them, interference imaging spectroscopy technology is a new detection technology developed in the 1980s. It uses the Fourier transform relationship between interference information and spectral information to calculate the spectral information of the target and obtain the two-dimensional spatial information of the target. The image-plane interference imaging spectroscopy technology that appeared in the mid-to-late 1990s...

AI Technical Summary

Problems solved by technology

This method is currently only used in spatially modulated interferometric imaging spectrometers, but in spatially modulated interferometric imaging spectrometers, the use of slits makes there is a constraint relationship between spatial resolution and luminous flux

In order to obtain high spatial resolution, it is usually necessary to reduce the width of the slit, and the result is a great loss of light flux

Spectral detection of weak radiation targets, especially astronomical targets, will increase the burden of detector response sensitivity

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