The Influence of CO2 Molecular Relaxation Dynamics on Photoacoustic Signal in Near Infrared (NIR) Range
LI Jin-song1,LIU Kun1,ZHANG Wei-jun1,CHEN Wei-dong2,GAO Xiao-ming1
1. Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. Laboratoire de Physicochimie de l’Atmosphre, Universite du littoral Cǒe d’Opale, 145 AV. Maurice Schumann, 59140 Dunkerque, France
Abstract：Photoacoustic spectroscopy (PAS) based on tunable diode laser (TDLPAS) is a widely recognised method for its excellent performance in trace gas monitoring and spectral analysis. This spectral technique provides many advantages such as high selectivity and sensitivity, on-line, real time and contactless measurements in a compact experimental arrangement. In the present paper, a resonant PA spectrometer based on a low-power near infrared distributed feedback (DFB) diode laser and a home-made resonant PA cell operating on its first longitudinal mode is developed, and the PA system has the advantage of simple experimental setup, easy operation, and low-cost, room temperature operating, etc. By investigating the performances of the PA cell at first, a good agreement was achieved between experimental and theoretical results; we have systematically investigated the influence of molecular relaxation effect on the PA detection of CO2 molecule near 1.573 μm, and presented the relevant analysis in theory. The research result shows that the detection sensitivity of the system based on PAS technique can be effectively improved by using the molecular relaxation effect.
李劲松1,刘锟1,张为俊1,陈卫东2,高晓明1 . 近红外波段CO2分子弛豫动力学效应对光声信号的影响[J]. 光谱学与光谱分析, 2008, 28(09): 1953-1957.
LI Jin-song1,LIU Kun1,ZHANG Wei-jun1,CHEN Wei-dong2,GAO Xiao-ming1. The Influence of CO2 Molecular Relaxation Dynamics on Photoacoustic Signal in Near Infrared (NIR) Range. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(09): 1953-1957.
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