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
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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,CHCH4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 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).
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