Imaging spectrometer based on grating translational light modulator

Abstract

The invention discloses an imaging spectrometer based on a grating translational light modulator, which can apply a linear array detector. The imaging spectrometer comprises a receiving optical system, a dispersing component, an imaging lens, a grating translational light modulator array, a convergent mirror and a detector, wherein radiation information of a target is imaged on the dispersing component line by line according to different time sequences by using the receiving optical system, and is imaged on programmable grating translational light modulator linear arrays by using the imaging lens after being subjected to light splitting by the dispersing component; the grating translational light modulator linear arrays are programmed and driven line by line, so that light of different wavelengths passes through according to the time sequence and is converged onto the detector by using the convergent mirror; and through data synthesis, the spatial dimension information and optical dimension information of the target are obtained. The spectrometer has the advantages of small size, light weight, low price, high speed and high resolution, and can be widely applied to the fields of space flight and aviation remote sensing, industry, agriculture, biological medicine, substance analysis and classification, universal and astronomical detection, environment and disaster monitoring, atmosphere detection, searching and tracking of military targets, and the like.

Description

technical field [0001] The invention relates to an imaging spectrometer, more specifically, the invention relates to an imaging spectrometer based on a grating translational light modulator area array manufactured by a micro-opto-electromechanical system. Background technique [0002] Imaging spectroscopy technology is a new type of multi-dimensional information acquisition technology that combines imaging technology and spectroscopy technology. It can obtain the spatial information and spectral information of the detected target. The commonly used imaging spectrometer mainly detects the two-dimensional space and one-dimensional spectral information of the target to form a data cube. To obtain three-dimensional data, scanning technology or multi-channel detection technology must be used. According to the classification of orbital imaging, scanning imaging spectrometers can be divided into optical-mechanical scanning imaging and push-broom imaging. Optical-mechanical scanni...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an imaging spectrometer with small volume, light weight and low price, which overcomes the disadvantages of high cost of the focal plane device of the pushbroom type spectral imager and the inability to make a large area array; As the optical path gating element, it avoids the error introduced by the traditional mechanical imaging spectrometer due to vibration and wear, and surpasses the liquid crystal imaging spectrometer in terms of modulation speed, bandwidth, and efficiency, and can avoid the DMD mirror reflection MOEMS imaging spectrometer. Optical Interference Caused by Micromirror Gap for Efficient Light Modulation

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