基于波导CO_2激光器的光声光谱仪

基于波导CO2 激光器的光声光谱仪采用了激光谐振腔内置光声池结构、低噪声纵向共振光声池和计算机控制的多谱线多种气体成分测量分析系统。文中详细给出了波导CO2 激光器和光声池的设计参数 ,介绍了多种气体成分同时测量的原理和计算机控制测量软件的设计思想。实验中对有Brewster窗片和无窗片光声池的噪声特性和检测灵敏度极限作了分析比较。实验结果表明 ,该光谱仪对C2 H2 和O3的极限检测灵敏度分别达到 10 -11和 10 -9量级 ,能够对多种与大气污染和生物气体交换有关的微量气体进行高灵敏度、实时、连续、自动地监测。

Photoacoustic spectrometer based on CO_2 waveguide laser

Theintracavity photoacoustic spectrometer(PAS) based on CO 2 waveguide laser contains a longitudinal resonant photoacoustic cell and acomputer controlled multi-component measurement system.Thedesign parameters of the CO 2 waveguide laser and the PA cell areexhibited in detail.The principle of simultaneous multi-component detection and the schemes of the controlling-detction soft ware are introduced.The experimental results show the detection limits to O 3 and C 2H 4 are 1 ppbV and 10 pptV respectively.This highsensitive system can be used to monitor trace gases relevun to air pollution and biology gas exchange real time,continuously and automati cally.