SONG Shao-lou, FAN Yong-feng, DING Yong-feng. Study on photoacoustic spectroscopy detection of coal mine gas[J]. 2013, 32(5): 64-67+73. DOI: 10.13873/j.1000-97872013.05.003.
煤矿瓦斯气体的光声光谱检测研究
摘要
煤矿瓦斯(CH4)是一种可用于诊断煤矿安全生产的特征气体。光声光谱技术是一种新型的气体检测技术
具有选择性好、灵敏度高、动态监测范围大、不消耗被测气体等优点
能很好地应用到CH4气体的在线监测。基于光声光谱技术的基本原理
利用分布反馈半导体激光器构建一种用以检测CH4的光声光谱装置
利用该装置研究了气体光声信号与CH4浓度、温度、斩波频率、激光功率、背景气体、以及压强之间的关系
并测得甲烷在2ν3带的R(3)支的光声光谱。
Abstract
Coal mine gas CH4 is a characteristic gas which can be used for the diagnosis of coal mine safety production.Photoacoustic spectroscopy(PAS)is a new method for gas detection
which has high selectivity
high sensitivity
large dynamic detection range and not consuming the measured gas
and can be well applied to on-line monitoring of coal mine gas.Distributed feedback semiconductor laser is used to construct a PAS device for CH4 detection by which the relation between photoacoustic signal varies with the CH4 concentration
temperature
chopped frequency
laser power
background gas and gas pressure are investigated
and the photoacoustic spectrum of R(3)in the 2ν3 band of methane is gotten.
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