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.
Received: 05 August 2005
Revised: 19 January 2006
Accepted manuscript online:
Fund: 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).
Cite this article:
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) Application of $\alpha$-$\beta$-$\gamma$ filtering to real-time atmosphere methane concentration measurement 2006 Chinese Physics 15 1379
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