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
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.
Key words:Fourier transform spectrometer;Collimation error;Reverse of contrast;Side slope noise
[1] WENG Shi-fu(翁诗甫). Fourier Transform Infrared Spectrometer(傅里叶变换红外光谱仪). Beijing: Chemical Industry Press(北京:化学工业出版社), 2005. 34. [2] SHI Jun-feng, HUI Mei, WANG Dong-sheng, et al(史俊峰,惠 梅,王东生,等). Optical Technique(光学技术), 2003, 29(1): 13. [3] KONG Yan-mei, LIANG Jing-qiu, LIANG Zhong-zhu, et al(孔延梅,梁静秋,梁中翥,等). Semiconductor Optoelectronics(半导体光电), 2008, 29(1): 1. [4] Jeongsik Sin, Woo Ho Lee, Dan Popa, et al. Proc. of SPIE, 2006, 6109(4): 1. [5] Reyes D, Schildkraut E R, Kim J, et al. Proc. of SPIE, 2008, 6888(D): 1. [6] WANG Bo, LIANG Zhong-zhu, KONG Yan-mei, et al(王 波,梁中翥,孔延梅,等). Acta Physica Sinica(物理学报), 2010, 59(2): 907. [7] ZHANG Zhi-yong, YANG Zu-ying(张志涌,杨祖樱). The Tutorial of MATLAB(MATLAB教程(R2008a)). Beijing: Beijing University of Aeronautics & Astronautics Press(北京: 北京航空航天大学出版社), 2008. 67.