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本文对气体红外激光光声光谱的理论进行探讨,并以分子运动论的物理模型对气体光声信号进行推导。为了提高气体光声系统灵敏度,设计了亥姆霍兹共振光声池,并作了实验验证,其实验数据与理论值基本相符。对乙烯、苯、甲醇、二氯甲烷、氨等微量气体进行了实验检测,得到了它们的光声光谱。实验结果证明,我们建立的气体红外激光光声光谱装置,可对痕量气体进行检测。为大气污染的检测提供了一种先进的高灵敏而又可靠的检测方法。
In this paper, the theory of gas infrared laser photoacoustic spectroscopy is discussed, and the gas photoacoustic signal is deduced from the physical model of molecular motion theory. In order to improve the sensitivity of the gas photoacoustic system, a Helmholtz resonant photoacoustic tank is designed and experimentally verified. The experimental data are in good agreement with the theoretical values. Experiments were carried out on the trace gases of ethylene, benzene, methanol, methylene chloride and ammonia, and their photoacoustic spectra were obtained. The experimental results show that the gas infrared laser photoacoustic spectrometer set up by us can detect trace gases. For the detection of air pollution provides an advanced high sensitivity and reliable detection methods.