哈达玛光谱仪能量偏移的修正算法(英文)

A Correction Algorithm on Reducing Energy Excursion Phenomenon

介绍了采用数字微镜器件的哈达玛光谱仪的成像原理及光学结构,阐述了数字微镜器件像元大小与探测器阵列尺寸不匹配,从而导致光谱能量偏移的现象.通过对复原图像进行修正,提出了矩阵修正算法.采用由哈达玛光谱仪得到的7阶植物光谱图像,对复原图像应用矩阵修正算法进行修正,有效减小了明暗条纹现象.为了提高复原图像的成像质量,实验选取相邻明暗条纹中的点绘制光谱曲线图,结果表明:存在能量偏移的暗条纹处的光谱曲线偏移较大,明条纹处光谱曲线基本重合,证明了修正算法的有效性.

The imaging principle and the structure of a Hadamard transform spectral imager with a digital micro-mirror device are presented.A phenomenon of energy excursion which is caused by mismatching of the mask unit size and the detector pixel size is expatiated.To fix the recovery images,a matrix correction algorithm is proposed.The 7-order images of plants acquired by the Hadamard transform spectral imager are used and the correction algorithm is operated on the recovery images with error,which reduces the phenomenon of dark stripes effectively.In order to improve the image quality of the recovery images,two dots in and off two adjacent dark stripes are selected to show the spectrum curves.The results show the close spectrum curves of the dot off dark stripes and the different curves of the dot in dark stripes.The comparison illustrates the validity of the correction algorithm.