The use of a homemade gas leak detector based on laser photo-acoustic spectroscopy for fast and sensitive trace gas detection is reported. To obtain optimal acoustic resonator dimensions, resonant frequency variations in terms of resonator's length and radius were simulated, and then a gas leak detector based on photo-acoustic theory was designed and fabricated. The system limit of detection to trace NO₂, SO₂ and SF₆ was 92, 270 and 8 ppb respectively. Therefore, this system can be used as a sensitive gas sensor for detecting partial leakage of some environmental and industrial pollutants. Variations of the resonant frequency versus various concentrations of NO₂, SO₂ and SF₆ in the presence of different buffer gases were studied, and results showed that the lighter buffer gas gives a higher resonance frequency. Also, variations of the photo-acoustic signal and SNR of these gas samples in terms of various CO₂ laser powers in the presence of different buffer gases were investigated, and the saturation laser power for each experiment was obtained. Finally, it was shown that experimental results are in good agreement with photo-acoustic theory.

据报道，基于激光光声光谱法的自制气体泄漏检测器可用于快速，灵敏的痕量气体检测。为了获得最佳的声谐振器尺寸，模拟了谐振器长度和半径的谐振频率变化，然后设计并制造了基于光声理论的气体泄漏检测器。痕量NO ₂，SO ₂和SF ₆的检测系统极限分别为92、270和8 ppb。因此，该系统可用作检测某些环境和工业污染物部分泄漏的灵敏气体传感器。共振频率随NO ₂，SO ₂和SF ₆浓度的变化在存在不同缓冲气体的条件下进行了研究，结果表明，较轻的缓冲气体具有较高的共振频率。此外，研究了在不同缓冲气体存在下，这些气体样品的光声信号和SNR在各种CO ₂激光功率方面的变化，并获得了每个实验的饱和激光功率。最后，表明实验结果与光声理论吻合良好。