Spatial modulation Hadamard transform spectrograph based on DMD and spectrum rebuilding method

Abstract

The invention provides a spatial modulation Hadamard transform spectrograph based on a DMD and a spectrum rebuilding method. A Hadamard transform coding template is obtained by means of the DMD to replace an entrance slit of a conventional scanning dispersion type spectrograph, so that modulation of targeted space is achieved and modulated signals are dispersed to generate a target spectrum image. An inverse matrix using a Hadamard transform matrix acts on a dispersion spectrum data matrix, and then a rebuilt target scene spectrum data matrix is obtained. By the adoption of the spatial modulation Hadamard transform spectrograph based on the DMD and the spectrum rebuilding method, the working efficiency of the spectrograph is improved, and the problem that target scene spectrum data high in resolution and high in signal to noise ratio are hard to obtain for a traditional slit spectrograph under the conditions of weak light source energy and weak light is solved.

Description

technical field [0001] The invention belongs to the technical field of spectral measurement and spectral imaging, and in particular relates to a DMD-based spatially modulated Hadamard transform spectrometer and a spectral reconstruction method. Background technique [0002] The imaging spectrometer is used to detect the two-dimensional spatial information and one-dimensional spectral information of the target, and then form a three-dimensional data cube, so as to realize the comprehensive detection and identification of the target characteristics. Optical detectors can only detect two-dimensional signals at most. To obtain a three-dimensional data cube, scanning technology or multi-channel detection technology must be used. At present, imaging spectrometers have been widely used in biochemistry, medical research, environmental and safety monitoring, ecological research, space detection research and other fields. [0003] The traditional conventional scanning dispersive spec...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a DMD-based spatially modulated Hadamard transform spectrometer and a spectral reconstruction method, which improves the working efficiency of the spectrometer and solves the problem that the traditional slit spectrometer is difficult to obtain high resolution when the energy of the light source is weak and the light is weak. The problem of target scene spectral data with high rate and high signal-to-noise ratio

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