Tengfei YANG, Wenyun KANG, Wenyue ZHU, Qiang LIU, Xianmei QIAN, Haiping MEI, Jie CHEN, Tao YANG, Jianjie ZHENG. All-optical photoacoustic spectroscopy device for CH4 leak detection[J]. Infrared and Laser Engineering, 2024, 53(11): 20240314
- Infrared and Laser Engineering
- Vol. 53, Issue 11, 20240314 (2024)
Fig. 1. Absorption spectrum of CO2, CH4 and H2O
Fig. 2. Diagram of the experimental device
Fig. 3. (a) Simulation chart of cantilever beam (The lower right is the physical diagram of the cantilever beam); (b) The relationship between the first-order resonance frequency and the thickness and length of the cantilever
Fig. 4. Diagram of the internal structure of the cantilever microphone （The lower right is the physical diagram of the cantilever microphone）
Fig. 5. (a) Diagram of the experimental device for program control; (b) Comparison diagram before and after Q -point stabilization program control
Fig. 6. Frequency response of a photoacoustic measurement device
Fig. 7. (a) The photoacoustic measurement device tests the 2f-WMS signal at different concentrations of CH4; (b) Response of photoacoustic device to the CH4 concentration
Fig. 8. (a) Background noise of photoacoustic device within 1 000 s; (b) Allan variance results
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