中国物理B ›› 2006, Vol. 15 ›› Issue (6): 1379-1383.doi: 10.1088/1009-1963/15/6/042

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Application of α--β--γ filtering to real-time atmosphere methane concentration measurement

阚瑞峰, 刘文清, 张玉钧, 刘建国, 陈东, 王敏   

  1. Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2005-08-05 修回日期:2006-01-19 出版日期:2006-06-20 发布日期:2006-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10274080) and the National High Technology Research and Development Program of China (Grant No 2003AA641010).

Application of $\alpha$-$\beta$-$\gamma$ filtering to real-time atmosphere methane concentration measurement

Kan Rui-Feng (阚瑞峰), Liu Wen-Qing (刘文清), Zhang Yu-Jun (张玉钧), Liu Jian-Guo (刘建国), Chen Dong (陈东), Wang Min (王敏)   

  1. Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Hefei 230031, China
  • Received:2005-08-05 Revised:2006-01-19 Online:2006-06-20 Published:2006-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10274080) and the National High Technology Research and Development Program of China (Grant No 2003AA641010).

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摘要： A real time $\alpha$--$\beta$--$\gamma$ filtering technique is applied to the monitoring of atmosphere CH$_{4}$ based on a tunable diode laser spectrum system operating at 1.654\,$\mu$m. This technique is developed for improving the sensitivity and precision of CH$_{4}$ concentration measurement with slow concentration change. The effectiveness of this technique is evaluated by performing CH$_{4}$ concentration measurement and using it to monitor the varying methane level in the atmosphere. It was proved that signal noise ratio enhancement factor is 4.25. The comparison between this filter and moving average is also included in this article. It indicates the advantage of the $\alpha$--$\beta$--$\gamma$ real time filter.

关键词: tunable diode laser absorption spectroscopy, multi-pass cell, harmonic detection

Abstract: A real time $\alpha$-$\beta$-$\gamma$ filtering technique is applied to the monitoring of atmosphere CH$_{4}$ based on a tunable diode laser spectrum system operating at 1.654 $\mu$m. This technique is developed for improving the sensitivity and precision of CH$_{4}$ concentration measurement with slow concentration change. The effectiveness of this technique is evaluated by performing CH$_{4}$ concentration measurement and using it to monitor the varying methane level in the atmosphere. It was proved that signal noise ratio enhancement factor is 4.25. The comparison between this filter and moving average is also included in this article. It indicates the advantage of the $\alpha$-$\beta$-$\gamma$ real time filter.

Key words: tunable diode laser absorption spectroscopy, multi-pass cell, harmonic detection

中图分类号:  (Laser spectroscopy)

  • 42.62.Fi
42.55.Px (Semiconductor lasers; laser diodes)