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

• 来源期刊: 中国物理（英文版）
• 关键词: tunable diode laser absorption spectroscopy multi-pass cell harmonic detection
• 年，卷（期）: 2006,（6）
• 页码范围: 1379-1383
• 页数: 5页
• 语种: 英文

摘要

A 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.