【作者】 阚瑞峰； 刘文清； 张玉钧； 刘建国； 王敏； 陈军； 王晓梅； 陈玖英； 崔益本；

【Author】 KAN Rui-feng LIU Wen-qing ZHANG Yu-jun LIU Jian-guo WANG Min CHEN Jun WANG Xiao-mei CHEN Jiu-ying CUI Yi-ben (Key Lab.of Environmental Optics & Technology,Anhui Institute of Optics and Fine Mechanics,the Chinese Academy of Sciences,Hefei,Anhui 230031,China)

【机构】 中国科学院安徽光学精密机械研究所环境光学与技术重点实验室；

【摘要】 利用分子红外光波段的吸收光谱特性,采用可调谐二极管激光吸收光谱技术(TDLAS)研究各种大气痕量气体分子的吸收特征是近年来的热门研究领域。TDLAS 系统的关键是利用激光二极管有很高光谱分辨率和可调谐性的特点,可以对特定分子在特定光谱范围内的一条振转线的光谱吸收进行测量而反演吸收气体的浓度,而且能够把待测分子与背景的干扰区分开来。利用可凋谐二极管激光光谱、多次反射池、微弱信号检测等先进技术研制出高灵敏、高精度的大气温室气体在线连续自动监测仪。检测限达到0．087 mg/m~3,检测上限高于17．5 mg/m~3, 满足了对环境空气中甲烷进行检测的需要(空气中甲烷体积质量为1．16 mg/m~3)。更多还原

【Abstract】 It is a pop field using molecular character of absorption spectrum in infrared and tunable diode laser absorption spectroscopy to study many atmospheric trace gases absorption spectrum.Most of the molecular characteristic absorption is very weak,and the absorption line width is very narrow that can’t be measured by traditional methods.Laser has become the perfect light source using in the atmosphere monitoring due to its monochromatic,directional and high power.The key technique of the tunable diode laser absorption spectroscopy (TDLAS) is the diode laser’s character of high resolution and ability of tunable,it cart even obtain the concentration of trace gas by measuring a single absorption line without interferes from others.A sensitive and precise atmosphere greenhouse gas continuous monitor is developed by combining the TDLAS with multi-pass cell and weak signal detect technique.The detect limit is lower than 0.087 mg/m~3,and it can up to 17.5 mg/m~3.that is enough for the ambient methane detection (1.16 mg/m~3 in the air).更多还原