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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 optical structure of Hadamard spectrometer using digital micro-mirror devices are introduced, and the phenomenon that the pixel size of the digital micro-mirror device does not match the size of the detector array is introduced, which leads to the shift of the spectral energy.Through the correction of the restored image , A matrix correction algorithm is proposed.The seventh-order plant spectral image obtained by Hadamard spectrometer is used to correct the restored image by using the matrix correction algorithm, which effectively reduces the light and dark fringe phenomenon.In order to improve the imaging quality of the reconstructed image, The results show that the spectral curve at the dark stripe with energy offset is greatly offset and the spectral curve at the bright stripe is basically coincident, which proves the effectiveness of the correction algorithm.