强激光与粒子束, 2011, 23 (9): 2369, 网络出版: 2011-10-27
中心波长2.33 μm附近CO和CH4分子的同时探测
Simultaneous trace detection of carbon monoxide and methane at 2.33 μm
直接吸收光谱 离散型多通吸收池 探测极限 direct absorption spectroscopy astigmatic mirror multipass absorption cell carbon monoxide CO CH4 methane detection limit
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100 m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2.33 μm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 8 cm-1位置的吸收谱线和CH4在4 287.650 15 cm-1处的吸收谱线进行痕量探测,在40 698 Pa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)。
Abstract
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 multipass 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 (signaltonoise ratio is about 216) and 18.48×10-6 for methane (signaltonoise ratio is about 147).
赵辉, 刘锟, 蔡廷栋, 谈图, 汪磊, 高晓明. 中心波长2.33 μm附近CO和CH4分子的同时探测[J]. 强激光与粒子束, 2011, 23(9): 2369. Zhao Hui, Liu Kun, Cai Tingdong, Tan Tu, Wang Lei, Gao Xiaoming. Simultaneous trace detection of carbon monoxide and methane at 2.33 μm[J]. High Power Laser and Particle Beams, 2011, 23(9): 2369.