针对特定场合对光声光谱气体检测系统中光声池特征频率的设计需求，利用有限元分析法，以一阶圆柱形共振光声池为研究对象进行声学模态仿真，获得了前8阶声学模态；仿真分析谐振腔、缓冲室的半径和长度对光声池特征频率和光声信号强度的影响。仿真结果表明：当谐振腔半径为3 mm时，谐振腔长度为120 mm，缓冲室的半径、长度分别为14.7 mm、60 mm是光声池特征频率在1 400 Hz附近的最佳尺寸。

In view of the design requirements of the characteristic frequency of the photoacoustic cell in the photoacoustic spectroscopy gas detection system in specific occasions, the first eight acoustic modes are obtained by using the finite element analysis method and taking the first order cylindrical resonant photoacoustic cell as the research object. This paper simulates and analyzes the influence of the radius and length of the resonant cavity and buffer chamber on the characteristic frequency and photoacoustic signal strength of the photoacoustic cell. The simulation results show that when the radius of the resonant cavity is 3 mm, the length of the resonant cavity is 120 mm, and the radius and length of the buffer chamber are 14.7 mm and 60 mm respectively, which are the optimal dimensions for the characteristic frequency of the photoacoustic cell around 1 400 Hz.