画幅式层析成像光谱系统设计和实验研究

文章介绍一种无需时间或空间扫描的新型成像光谱仪—利用位相光栅作为分束器件的计算层析成像光谱仪 (CTIS)。重点介绍了各个系统的设计原则和位相光栅的设计 ,并给出了光栅的设计结果。详细介绍系统矩阵的实验定标方法和过程。叙述了自然光照明条件下真实物体组成的靶标的光谱成像实验 ,对目标实验采样的数据进行重构处理 ,给出了实验结果。

Diffractive Element of Computed Tomographic Imaging Spectrometer

A novel computed-tomography imaging spectrometer without moving parts is introduced, in which a diffractive element is specially designed. A novel compact imaging spectrometer system based on computed-tomography principle is introduced, in which a diffractive element is specially designed in this paper. The computed tomography imaging spectrometer (CTIS) records the projection data of different direction at the same time. The data cube of the object is acquired by reconstruction of the projection data. As only a 2-D binary phase grating is used as splitter and disperser, the result of the testing show the grating can meet the demand of the system. In our work, the grating is designed and fabricated, and the whole system is set up. The configuration of the system is presented and the method of the spectral and spatial calibration is introduced. The mapping matrix of system is established according to the results of calibration. The real object such as a colorful doll or a cluster of flower is imaged with the CTIS. The object cube of the real object is reconstructed with the EM algorithm. The size of the image of the object is about 200*200pixel, and the spectral range is from 410nm to 700nm. The spectral resolution is 10 nm which depends on the step of spectral calibration. The accuracy of reconstruction is analyzed. The experimental results are presented, and the work is proven to be encouraging.