摘要
干涉仪速度波动是影响光谱信噪比的重要因素之一,为了进一步提高光谱信噪比,对干涉仪速度波动与光谱信噪比之间的关系进行了研究。文中从旋转角度、反馈速度测量、电路噪声等方面定量分析了倾斜式干涉仪光程差速度波动的成因,在此基础上,通过理论分析和实验验证了光程差速度不稳定性对光谱信噪比的影响规律。实验结果表明,在同一波数区间,光程差速度稳定性越高,光谱信噪比越好,速度稳定性提高5%时,光谱信噪比提高约14%—16%。当光程差速度恒定时,低波数段的光谱信噪比明显优于高波数段,2100~2200 cm^(-1)波段比2500—2600 cm^(-1)波段的信噪比高约20%。该研究成果为高信噪比光谱仪的设计提供了理论基础。
The velocity fluctuation of the interferometer is one of the important factors affecting the spectral signal-to-noise ratio.To further improve the spectral signal-to-noise ratio,the relationship between the velocity fluctuation of the interferometer and the spectral signal-to-noise ratio is studied.In this paper,the causes of optical path difference velocity fluctuation of the tilt compensation interferometer are quantitatively analyzed from the aspects of rotation angle,velocity feedback testing,and circuit noise.On this basis,the influence law of optical path difference velocity instability on the spectral signal-to-noise ratio is verified through theoretical analysis and experiments.The experimental results show that in the same wavenumber range,the higher the velocity stability of optical path difference,the better the spectral signal-to-noise ratio.When the velocity stability is increased by 5%,the spectral signal-to-noise ratio is increased by about 14%—16%.When the optical path difference velocity is constant,the spectral signal-to-noise ratio in the low wavenumber band is significantly better than that in the high wavenumber band,and the signal-to-noise ratio in the 2100—2200 cm^(-1) band is about 20%higher than that in the 2500—2600 cm^(-1) band.The research results provide a theoretical basis for the design of a high signal-to-noise ratio spectrometer.
作者
秦玉胜
李相贤
韩昕
童晶晶
高闽光
刘淑芬
QIN Yusheng;LI Xiangxian;HAN Xin;TONG Jingjing;GAO Minguang;LIU Shufen(Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,Anhui 230031,China;University of Science and Technology of China,Hefei,Anhui 230026,China;Taian Ecological Environment Monitoring Center of Shandong Province,Taian,Shandong 271000,China)
出处
《光电子．激光》
CAS
CSCD
北大核心
2022年第5期449-457,共9页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(42075135)
安徽省重点研究与开发计划项目(202104a05020026)资助项目。
关键词
干涉仪
速度波动
光谱仪
波数
信噪比
interferometer
velocity fluctuation
spectrometer
wavenumber
signal-to-noise ratio
作者简介
李相贤(1983一),男,副研究员,博士,主要从事环境光学仪器方面的研究,E-mail:lixx@aiofm.ac.cn。
