| A high sensitivity spectrometer with tunable diode laser for ambient methane monitoring |
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| 作者姓名： | 阚瑞峰 刘文清 张玉钧 刘建国 王敏 陈东 陈玖英 崔益本 |
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| 作者单位： | Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Hefei 230031，Hefei 230031，Hefei 230031，Hefei 230031，Hefei 230031，Hefei 230031，Hefei 230031 |
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| 基金项目： | This work was supported by the National High Tech-nology Research and Development Program of China (No. 2005AA641010)，the National Natural Science Foundation of China (No. 50534050). |
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| 摘 要： | Tunable diode laser absorption spectroscopy (TDLAS) has been widely employed in atmospheric trace gases detection. In the measurement of these trace gases, harmonic detection combined with a multi-pass white cell could remarkably enhance the detection sensitivity. In this paper, a portable TDLAS system built specifically for long time monitoring methane in the atmosphere is introduced. The detection limit is below 100 ppb that is enough for the monitoring of ambient methane, and the long time monitoring results obtained in Beijing are given, which is well coincident with that of the Fourier transform infrared (FTIR) spectroscopy.
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