Wenqing Liu, Xingping Wang, Guosheng Ma, Ying Liu, Zhihao Zhao, Xiang Li, Hao Deng, Bing Chen, Ruifeng Kan. Research of High Sensitivity Cavity Ring-Down Spectroscopy Technology and Its Application[J]. Acta Optica Sinica, 2021, 41(1): 0130003
- Acta Optica Sinica
- Vol. 41, Issue 1, 0130003 (2021)
Fig. 1. Schematic of atmospheric CO2 concentration measurement based on CRDS
Fig. 2. Results of long-time measurement of empty cavity. (a) Ring down measurement result; (b) result of Allen variance
Fig. 3. Spectral fitting of CO2 with concentration of 99×10-6 and its residual
Fig. 4. Schematic of high vacuum optical hygrometer based on CRDS[93]
Fig. 5. Integral absorption coefficients of the four absorption lines selected at dew-point temperature with different vapor pressures[93]
Fig. 6. Measurement results of trace water vapor absorption spectrum[93]
Fig. 7. Schematic of atmospheric methane measuring instrument based on CRDS[96]
Fig. 8. Results of continuous monitoring of atmospheric methane concentration[96]
Fig. 9. Methane vertical profile measurement system based on balloon-borne CRDS[89]. (a) System principle diagram; (b) physical diagram of the system
Fig. 10. The site of the second Qinghai-Tibet Plateau comprehensive scientific research test by captive balloon at Lulang[89]
Fig. 11. Spectral measurement and fitting results[89]. (a) At 5250 m altitude during the ascent; (b) at 5600 m altitude during the descent
Fig. 12. Measurement results of vertical distribution of methane concentration[89]. (a) During the ascent; (b) during the descent
Fig. 13. Schematic of in situ analysis system for deep-sea dissolved methane[88]
Fig. 14. 3D design drawing of optical cavity[88]
Fig. 15. In the case of water vapor interference, the results of methane spectral fitting and its residual[88]. (a) Without water vapor spectral fitting; (b) with water vapor spectral fitting
Fig. 16. Compared with the measurement results of atmospheric methane concentration by the AIOFM methanometer and the commercial Piccaro methanometer[88]
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