高灵敏探测甲烷气体的实验研究

马维光; 尹王保; 董磊; 李昌勇; 贾锁堂

中国激光, 2004, 31 (s1): 287, 网络出版: 2013-01-29

高灵敏探测甲烷气体的实验研究

Experimental Research of High-Sensitivity Detection of Methane

论文大纲

马维光 ^*尹王保董磊李昌勇贾锁堂

作者单位

山西大学物理电子工程学院,量子光学与光量子器件国家重点实验室, 山西太原 030006

应用光学直接吸收光谱谐波探测甲烷2v3带R(9)支 applied optics direct absorbance harmonic detection methane 2v3 band R(9) manifold

摘要

通过外腔二极管激光器探测了甲烷位于1.637 μm处的2v3带R(9)支的直接吸收光谱,利用直接吸收方法只获得了1.4×10-3的最小探测吸收,当采用谐波探测技术时,在最佳的调制幅度下2f,4f,6f分别获得了5.2×10-4,1.1×10-4,4.0×10-5的最小探测吸收,相对于直接吸收有了很大的提高,同时谐波次数越高其探测灵敏度越高.

Abstract

In this paper, the direct absorption spectrum of methane 2v3 band R(9) manifold near 1.637 mm was detected The minimum detectable absorbance of 1.4×10-3 was achieved, while the minimum detectable absorbencies of 5.2×10-4, 1.1×10-4, 4.0×10-4 were obtained by use of harmonic detection for respectively in the condition of optimized modulation. There is a great improvement relative to the direct absorbance. Meanwhile the higher is the order of harmonic, the higher is the detection sensitivity.

参考文献

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马维光, 尹王保, 董磊, 李昌勇, 贾锁堂. 高灵敏探测甲烷气体的实验研究[J]. 中国激光, 2004, 31(s1): 287. MA Wei-guang, YIN Wang-bao, DONG Lei, LI Chang-yong, JIA Suo-tang. Experimental Research of High-Sensitivity Detection of Methane[J]. Chinese Journal of Lasers, 2004, 31(s1): 287.

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