Fig. 1. Schematic diagram of photoacoustic spectroscopy gas detection principle.光声光谱气体检测原理示意图

Fig. 2. Photoacoustic spectroscopy gas detection device.光声光谱气体检测实验装置图

Fig. 3. Acoustic physical model of photoacoustic cell cavity.光声池空腔声学物理模型

Fig. 4. Acoustic mode simulation of photoacoustic cell cavity: (a)The first mode (265 Hz); (b) the second mode (1659 Hz); (c) the third mode (3125 Hz); (d) the fourth mode (3490 Hz); (e) the fifth mode (3680 Hz); (f) the sixth mode (4966 Hz) ; (g) the seventh mode (5123 Hz); (h) the eighth mode (6207 Hz).光声池空腔声学模态仿真云图

Fig. 5. Two dimensional axisymmetric physical model of photoacoustic cell.光声池二维轴对称物理模型

Fig. 6. Detail drawing of mixed meshes in the middle of resonator.谐振腔中部混合网格剖分细节图

Fig. 7. Simulation curve of photoacoustic cell's coarse frequency response.光声池粗频响应仿真曲线

Fig. 8. Simulation curve of photoacoustic cell's fine frequency response.光声池细频响应仿真曲线

Fig. 9. Sound pressure characteristic curve of cavity geometry of photoacoustic cell.光声池谐振腔母线声压特性曲线

Fig. 10. Temperature rise characteristic curve of orthogonal center line of photoacoustic cavity resonator axis.光声池谐振腔轴线正交中心线温升特性曲线

Fig. 11. Comparison of calculation results: (a) Resonance frequency; (b) quality factor; (c) pool constant; (d) boundary layer thickness.计算结果比较

Fig. 12. Optimum design parameters of photoacoustic cell.光声池参数优化设计选取

Fig. 13. Pareto optimal solution frontier distribution map.Pareto最优解前沿分布图