光谱学与光谱分析 |
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Analysis and Correction of Spectral Curvature in Hadamard Transform Spectrometer with DMD |
QUAN Xiang-qian1,2, LIU Hua1*, LU Zhen-wu1, WANG Xiao-duo1,2, DANG Bo-shi1, CHEN Xiang-zi1,2, WANG Fang1 |
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033,China 2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Due to the advantages of its low cost and high utilization rate of light energy and no moving parts,Hadamard transform spectrometer with DMD has become a focus in the research of spectrometer. In order to solve the reduction of spectral resolution caused by the spectral curvature of Hadamard transform spectrometer with DMD (Digital Micro-mirror Device), the spectral aliasing in the spectrometer was investigated. Firstly, the mathematical relationship of spectral aliasing to radius of spectral curvature was deduced. Then, two procedures were proposed to solve the spectral aliasing. One is making the DMD encoded spectral band accordant with the standard spectral band as far as possible by adjusting the DMD-encoded stripe,and another is correcting remaining spectral aliasing by means of data processing. Finally,by analyzing and correcting spectral curvature in six situations of the curvature radius of 15.8×104,7.8×104,9.7×104 μm and etc,we fit out the relationship of spectral aliasing and spectrum correction effect of spectral curvature to the curvature radius. The simulation indicates that the spectral resolution increases to the resolution of optical system. It shows that the proposed methods are universal, simple and effective in the improvement of spectral resolution.
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Received: 2014-07-17
Accepted: 2014-11-09
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Corresponding Authors:
LIU Hua
E-mail: girlliuhua@sohu.com
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