Spectrum reconstruction method based on reverse dual light path

Abstract

The invention brings forward a spectrum reconstruction method based on a reverse dual light path. A target spectrum image after forward dispersion and the target spectrum image after backward dispersion are obtained by utilizing a reverse dual light path structure; a generalized inverse matrix of an equivalent data matrix of slit movement and superposition effect in the reverse dual light path is applied to respectively act on a forward dispersion spectrum data matrix and a backward dispersion spectrum data matrix so that a forward spectrum data matrix approximate value and a backward spectrum data matrix approximate value of a target scene are obtained; and then solution is obtained via a cross iteration mode so that the spectrum data matrix of the target scene after reconstruction is obtained. A high amount of light transmission can be ensured and spectrum resolution can also be effectively enhanced by the spectrum reconstruction method.

Description

technical field [0001] The invention belongs to the technical field of spectral measurement and spectral imaging, and in particular relates to a spectral reconstruction method based on reverse dual optical paths. Background technique [0002] An imaging spectrometer is a spectroscopic instrument that can divide the target spectrum of a continuous spectrum into multiple narrow bands, and the elements contained in the item can be measured through the analysis of the target spectrum. Therefore, imaging spectrometer is a common equipment for analyzing material structure and composition processing, and is widely used in metallurgy, geology, chemical industry, medicine, environment and other fields. [0003] Currently, the most common imaging spectrometers are slit-based spectrometers whose spectral resolution is directly related to the slit width. In order to achieve the ideal high resolution, the slit width must be narrow enough, and the too narrow slit severely limits the ener...

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Problems solved by technology

[0007] The present invention aims at the key problem that the existing slit-based imaging spectrometer has limited detection capability under weak light, and proposes a spectral reconstruction method based on reverse dual optical paths, which solves the problem of traditional slit-based spectrometers with weak light source energy and light Problem with weak cases where it is difficult to obtain target scene spectra with high spectral resolution

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