| Large scale gas leakage monitoring with tunable diode laser absorption spectroscopy |
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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，Key Laboratory of Environmental Optics & Technology，Key Laboratory of Environmental Optics & Technology，Key Laboratory of Environmental Optics & Technology，Key Laboratory of Environmental Optics & Technology，Key Laboratory of Environmental Optics & Technology，Key Laboratory of Environmental Optics & Technology，Key Laboratory of Environmental Optics & Technology Anhui Institute of Optics and Fine Mechanics，Chine se Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031 |
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| 基金项目： | This project was supported by the National Natural Science Foundation of China (No. 10274080)
the National High Technology Research and Development Program of China (No. 2003AA641010). |
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| 摘 要： | Tunable diode laser absorption spectroscopy (TDLAS) has been widely employed in atmospheric trace gases detecting and industrial control due to its high sensitivity, selectivity, and rapidity of response. An open path TDLAS system is developed for monitoring large scale methane leakage around the oil refinery. The tunable distributed feedback (DFB) diode laser emits at 1.65 fun. In order to enhance the sensitivity, a system combining long open path and second harmonic detection technique is developed. The test results show that the time resolution is less than 0.1 second and the detection limit is lower than 3.6 ppmv. This system is adapted for monitoring a large scale methane concentration changing trend instead of measuring its absolute concentration.
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