中心波长2.33μm附近CO和CH_4分子的同时探测  

Simultaneous trace detection of carbon monoxide and methane at 2.33 μm

作　　者：赵辉[1] 刘锟[1] 蔡廷栋[1,2] 谈图[1] 汪磊[1] 高晓明[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031 [2]徐州师范大学物理与电子工程学院,江苏徐州221116

出　　处：《强激光与粒子束》2011年第9期2369-2372,共4页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目(2009AA06Z204);安徽省自然科学基金项目(11040606M147)

摘　　要：采用分布反馈式半导体激光器作为探测光源,结合程长为100m的离散型多通吸收池,采用直接吸收光谱技术,对室温下中心波长2.33μm附近各种低体积分数的CO及混合气体(CO,CH4和N2)的直接吸收光谱进行了测量。选择CO在4 288.289 8cm-1位置的吸收谱线和CH4在4 287.650 15cm-1处的吸收谱线进行痕量探测,在40 698Pa的总压力下,实验测得CO的探测极限为8.15×10-6(信噪比约为216),CH4的探测极限为18.48×10-6(信噪比约为147)。The spectrum of a series of low concentration carbon monoxide and mixed gas（carbon monoxide,methane and nitrogen） was obtained around 2.33 μm using a tunable distributed feedback semiconductor laser with an astigmatic mirror multi-pass absorption cell（optical path length 100 m） at room temperature through direct absorption technique.The absorption lines of carbon monoxide at 4 288.289 8 cm-1 and methane at 4 287.650 15 cm-1 were chosen for trace detection.At the total pressure of 40 698 Pa,the detection limits of carbon monoxide and methane were gotten respectively,i.e.8.15×10-6 for carbon monoxide（signal-to-noise ratio is about 216） and 18.48×10-6 for methane（signal-to-noise ratio is about 147）.

关 键 词：直接吸收光谱 离散型多通吸收池 CO CH4 探测极限 

分 类 号：O433.1[机械工程—光学工程]