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

A real time $alpha$--$beta$--$gamma$ filtering technique is applied tothe monitoring of atmosphere CH可调二极管激光吸收光谱 谐波检测 物理光学 激光技术tunable diode laserabsorption spectroscopy, multi-pass cell, harmonic detectionProject supported by the National Natural Science Foundation of China (Grant No 10274080) and theNational High Technology Research and Development Program of China (Grant No 2003AA641010).8/5/2005 12:00:00 AM2005-08-052006-01-19A real time α-β-γ filtering technique is applied to the monitoring of atmosphere CH4 based on a tunable diode laser spectrum system operating at 1.654μm. This technique is developed for improving the sensitivity and precision of CH4 concentration measurement with slow concentration change. The effectiveness of this technique is evaluated by performing CH4 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 α-β-γ real time filter.

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

A real time $alpha$--$beta$--$gamma$ filtering technique is applied tothe monitoring of atmosphere CH$_{4}$ based on a tunable diode laserspectrum system operating at 1.654,$mu$m. This technique isdeveloped for improving the sensitivity and precision of CH$_{4}$concentration measurement with slow concentration change. Theeffectiveness of this technique is evaluated by performing CH$_{4}$concentration measurement and using it to monitor the varyingmethane level in the atmosphere. It wasproved that signal noise ratio enhancement factor is 4.25.The comparison between this filter and moving average is alsoincluded in this article. It indicates the advantage ofthe $alpha$--$beta$--$gamma$ real time filter.