Ying LIU, Mai HU, Xingping WANG, Zhenyu XU, Yabai HE, Ruifeng KAN. Cavity ring-down spectrometer of CO2 with ppb detection sensitivity[J]. Optics and Precision Engineering, 2023, 31(20): 2921
- Optics and Precision Engineering
- Vol. 31, Issue 20, 2921 (2023)
Fig. 1. Schematic diagram of cavity ring-down spectroscopy
Fig. 2. Schematic diagram of measurement system
Fig. 3. Simulated absorption spectra of CO2， CH4 and H2O
Fig. 4. Structure of resonator
Fig. 5. Temperature control module
Fig. 6. Changes in gas temperature （a） and pressure （b） in the cavity over 24 hours
Fig. 7. Continuous measurement of ring-down time without absorption
Fig. 8. Allan variance analysis
Fig. 9. Correspondence between measured concentration of the system and standard gas concentration
Fig. 10. Results of comparison test between system and Picarro
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