Zhou Jin-Song, Xiangli Bin, Wei Ru-Yi
Laboratory of Spectral Imaging Technique, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 Nov;29(11):3163-6.
The principle and instrumental structure of dispersion Hadamard transform spectral imager were briefly described in the present paper, and the disadvantages of the imager both in dislocation of spatial and spectral information and in spectral resolution limited by the width of Hadamard encoding mask were pointed out. A new instrumental principle and design of spatially modulated interference Hadamard transform spectral imager was proposed. A lateral shearing interferometer was used to acquire interference signals of all the Hadamard encoding information at different optical path difference. Then the methods of Fourier transform and Hadamard transform for interferogram were performed to acquire the spectra of objectives. Theory analysis of this imager demonstrated that the modulation of interferogram would not be affected by some factors such as the form and size of Hadamard encoding mask, and the spectral resolution would not be influenced by the size of Hadamard encoding mask. Furthermore, such technique not only effectively eradicated the dislocation of spatial information and spectral information existing in dispersion Hadamard transform spectral imager, but also made it convenient to image with high-throughput, high spatial resolution and high spectral resolution.
本文简要介绍了色散哈达玛变换光谱成像仪的原理和仪器结构，指出了该成像仪在空间和光谱信息错位以及光谱分辨率受哈达玛编码掩模宽度限制方面的缺点。提出了一种空间调制干涉哈达玛变换光谱成像仪的新仪器原理和设计。使用横向剪切干涉仪在不同光程差下获取所有哈达玛编码信息的干涉信号。然后对干涉图进行傅里叶变换和哈达玛变换方法以获取目标光谱。该成像仪的理论分析表明，干涉图的调制不受哈达玛编码掩模的形式和尺寸等因素影响，光谱分辨率也不受哈达玛编码掩模尺寸影响。此外，该技术不仅有效消除了色散哈达玛变换光谱成像仪中存在的空间信息和光谱信息错位问题，还便于进行高通量、高空间分辨率和高光谱分辨率的成像。
