Influence of molecular relaxation dynamics on quartz-enhanced photoacoustic detection of CO2 at λ =2 μm

被引：0
作者：
G. Wysocki
A.A. Kosterev
F.K. Tittel
机构：
[1] Rice University,Department of Electrical and Computer Engineering
来源：
Applied Physics B | 2006年 / 85卷
关键词：
Photoacoustic Spectroscopy; Photoacoustic Signal; Quartz Tuning Fork; Diode Laser Source; QEPAS Signal;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Carbon dioxide (CO2) trace gas detection based on quartz enhanced photoacoustic spectroscopy (QEPAS) using a distributed feedback diode laser operating at λ=2 μm is performed, with a primary purpose of studying vibrational relaxation processes in the CO2-N2-H2O system. A simple model is developed and used to explain the experimentally observed dependence of amplitude and phase of the photoacoustic signal on pressure and gas humidity. A (1σ) sensitivity of 110 parts-per-million (with a 1 s lock-in time constant) was obtained for CO2 concentrations measured in humid gas samples.
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页码：301 / 306
页数：5
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