均匀分布狭缝阵列编码光谱成像系统的仿真与验证

Simulation and Verification of Uniformly Distributed-slit Array Coded Spectral Imaging System

摘要:

为解决传统色散型高光谱成像仪扫描速度慢和编码孔径光谱成像系统存在部分信息失真或丢失、光谱重构复杂度高等问题,设计了一种基于均匀分布狭缝阵列的光谱成像系统,在编码孔径光谱成像系统的基础上,采用微位移电机控制阵列编码狭缝对成像视场进行微扫描,以实现光谱不混叠成像,在满足一定成像帧频的条件下实现动态场景的无损探测。仿真结果表明:在光谱图像重构质量与单狭缝系统结果一致的前提下,该系统的采集效率提升了17倍；空间结构相似度和光谱保真度分别是50%压缩采样率编码孔径光谱成像系统的1.8倍和1.17倍,在完成仿真的基础上,搭建实验装置进行了可行性验证。

Abstract:

In order to solve the problems of slow scanning speed of traditional dispersive hyperspectral imagers and the problems of information loss, signal distortion, and high reconstruction complexity in the coded aperture spectral imaging system, in this paper, a slit spectral imaging system based on a uniformly distributed array is designed. On the basis of the coded aperture spectral imaging system, a displacement motor is used to control the slit array code plate to perform field-of-view spectrum non-aliasing micro-scanning to realize the non-destructive detection of dynamic scenes. The simulation results show that the collection efficiency of this method is 17 times that of the single-slit system, and the system's spectral data reconstruction result is consistent with that of the single-slit system. The spatial structure similarity is 1.8 times and the spectral fidelity is 1.17 times of that of the 50% sampling rate coded aperture system. Finally, the system was verified by experiments.