激光技术2011，Vol.35Issue(5)：618-621,625,5.DOI:10.3969/j.issn.1001-3806.2011.05.012
移相自平衡激光吸收光谱技术的研究
Study on phase shift auto-balanced laser absorption spectroscopy
摘要
Abstract
Tunable diode laser absorption spectroscopy (TDLAS) is a flexible and well-developed technology used for gas detection in open optical path. In order to improve the detection sensitivity in the direct absorbing method, and solve the adaptation of auto-balanced detection requiring two similar optical paths, a so-called phase shift auto-balanced detection was presented, in which after filtering, amplifying and phase shifting, the absorption signal could be obtained from two optical signals with phase shift difference of 180°; and then gas density could be calculated after processing the absorption signal and the direct current indicating the light intensity. The results show that phase shift auto-balanced detection can overcome the disadvantages of the auto-balanced detection for it can not be used in the same optical path. In addition, it is very sensitive to the subtle change of signal and the signal-to-noise ratio is improved greatly, 8 ~ 9 times higher than direct detection. The phase shift auto-balanced detection can provide a sensitive and stable approach to detect the long-range gas and may be used in wider areas in the future.关键词
光谱学/可调谐二极管体激光吸收光谱学/移相自平衡探测/气体探测Key words
spectroscopy/ tunable diode laser absorption spectroscopy/ phase shift auto-balanced detection/ gas detection分类
数理科学引用本文复制引用
束小文,张玉钧,耿辉,张帅,许振宇,张亮..移相自平衡激光吸收光谱技术的研究[J].激光技术,2011,35(5):618-621,625,5.基金项目
安徽省重大科技攻关项目资助项目(67010301023) （67010301023）
中国科学院知识创新工程重要方向项目资助项目(KJCX2-SW-W27) （KJCX2-SW-W27）
