Hadamard transform imaging spectrometer based on bridge type grating light modulator

Abstract

The invention relates to a hadamard transform imaging spectrometer based on a bridge type grating light modulator, and the spectrometer provided by the invention can be applied to a linear array detector or single point detector. The hadamard transform imaging spectrometer comprises a receiving optical system, a chromatic dispersion element, an imaging mirror, a bridge type grating light modulator array, a focusing mirror and a detector, wherein the radiation information of a target is imaged on the chromatic dispersion element in lines by the receiving optical system according to different time sequences; after being split by the chromatic dispersion element, the radiation information is imaged on the programmable bridge type grating light modulator array by the imaging mirror; the bridge type grating light modulator array is programmed and driven according to a hadamard coding template, thereby allowing lights with different wavelengths to pass through in a manner of specific combination; the lights are focused on the detector by the focusing mirror; and finally, the space dimensional information and spectrum dimensional information of the target are acquired by performing the hadamard inverse transformation. The hadamard transform imaging spectrometer has the advantages of small volume, light weight, low cost, high speed and high signal to noise ratio. The hadamard transform imaging spectrometer can be widely applied to the fields of aerial remote sensing, industry, agriculture, biomedicine, matter analysis and classification, universal and astronomic surveillance, environment and disaster monitoring, atmospheric detection, searching and tracking for military targets, and the like.

Description

technical field [0001] The invention relates to a Hadamard transform imaging spectrometer, more specifically, the invention relates to a Hadamard transform imaging spectrometer based on a bridge grating light modulator, which can use a linear array detector or a single point detector for imaging. 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...

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a Hadamard transform imaging spectrometer with small size, light weight, low price and high S / N ratio, using the MOEMS bridge grating optical modulator (patent number ZL200810232833. The core component of the modulation overcomes the shortcomings of the high cost of the focal plane device of the pushbroom spectral imager and the inability to make a large area array; the bridge grating light modulator is used as the optical path gating element to avoid the introduction of mechanical template spectrometer due to vibration and wear. In addition, it surpasses liquid crystal template spectrometers in terms of modulation speed, bandwidth, and efficiency, and can avoid optical interference caused by the micromirror gap of DMD, a rotating mirror reflection MOEMS spectrometer, and achieve high-efficiency light modulation.

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