研究目的
To investigate the laser power effect on the performance of a gas leak detector based on laser photo-acoustic spectroscopy for fast and sensitive trace gas detection.
研究成果
The study successfully designed and fabricated a photo-acoustic resonator for detecting trace gases with high sensitivity. The system's performance was validated for NO2, SO2, and SF6 detection, showing good agreement with photo-acoustic theory. The lighter buffer gas (helium) resulted in higher resonance frequencies. The photo-acoustic signal and SNR increased with laser power until reaching saturation.
研究不足
The laser used as a source does not possess a broad bandwidth. The method is limited by the dynamic range of the microphone and electronic noise.
1：Experimental Design and Method Selection:
The study involved designing and optimizing a photo-acoustic resonator for gas detection, simulating resonant frequency variations, and fabricating a gas leak detector.
2：Sample Selection and Data Sources:
NO2, SO2, and SF6 gases were used as samples with various buffer gases (argon, synthetic air, nitrogen, helium).
3：List of Experimental Equipment and Materials:
A CO2 laser, optical chopper, sensitive microphone, power meter, and oscilloscope were used.
4：Experimental Procedures and Operational Workflow:
The photo-acoustic cell was evacuated and filled with gas samples and buffer gases. The photo-acoustic signal and resonant frequency were recorded for different laser powers.
5：Data Analysis Methods:
The photo-acoustic signal and SNR were analyzed in terms of laser power and buffer gas type.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
