光谱学与光谱分析 |
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Analysis of Collimation Error in Fourier Transform Infrared Spectrometer Based on Step Mirrors |
Lü Jin-guang1,2, LIANG Zhong-zhu1, FU Jian-guo1,2, LIANG Jing-qiu1* |
1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The collimation error in Fourier transform spectrometer has many effects on the interferogram and the spectrogram. By means of modulation, the authors found the reverse of contrast in the interferogram and the side slope noise in the spectrogram due to the collimation error. The authors analyzed the signal-to-noise ratio and resolution at different factor of beam divergence. When the factor of the beam divergence is 0.15°·mm-1, the signal-to-noise ratio can reduce to 6 dB and the resolution can go bad to 13.4 cm-1.
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Received: 2010-11-26
Accepted: 2011-03-30
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Corresponding Authors:
LIANG Jing-qiu
E-mail: liangjq@ciomp.ac.cn
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