Wenwen CHEN, Kaiyuan ZHENG, Yanwei CAO, Yixi CHEN, Chuantao ZHENG, Yiding WANG. Sensing System of Dissolved Methane in Water Based on Cavity-enhanced Laser Spectroscopy[J]. Acta Photonica Sinica, 2021, 50(9): 0930002
- Acta Photonica Sinica
- Vol. 50, Issue 9, 0930002 (2021)
Fig. 1. The absorption spectrum of CH4 and H2Oin the near-infrared
Fig. 2. The absorption spectrum of CH4， C2H6， C3H8， C2H2 and C2H4 within 6 030~6 055 cm-1
Fig. 3. Gas-liquid separation system
Fig. 4. Structure of the near-infrared methane sensor system based on OA-ICOS
Fig. 5. Curve of incident light intensity I 0， absorbed light intensity I and （I 0/I -1）
Fig. 6. Differential direct absorption amplitude at different concentration of CH4 gas
Fig. 7. Relationship between amplitude of differential direct absorption signal and measurement time under different CH4 concentration levels
Fig. 8. Fitting curve of CH4 gas concentration and the amplitude of the differential direct absorption signal
Fig. 9. Measurement results of CH4 concentration under N2 atmosphere
Fig. 10. Allan deviation curve
Fig. 11. The measured concentration results of the dissolved CH4 in tap water， rainwater and lake water using the developed CH4 sensor system
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