中文摘要：

设计制作了适合中红外激光光声光谱气体检测用的圆柱形光声腔,采用有限元法对其声信号的传输和探测进行了模拟分析并与实际测量结果进行了系统的比较.结果表明此光声腔中的二阶纵模在4.2KHz附近具有最大的共振幅度和适中的Q值,十分适合中红外光声光谱气体传感应用.

英文摘要：

A cylinder shape photoacoustic（PA） cell has been designed and fabricated for mid-infrared laser photoacoustic spectroscopy（MIR-PAS） gas sensing application.A complete modeling of the acoustic signal transmission and detection in the PA cell using FEM have been performed to simulate its characteristics and compared systemtically with the measured data.Results show that the second longitudinal mode of the PA cell has the highest resonance amplitude around 4.2 KHz with moderate Q value,so this mode is quite suitable for MIR-PAS gas sensing purpose.