Zhirong ZHANG, Hua XIA, Pengshuai SUN, Runqing YU, Xi YANG, Yuqing LIN, Bian WU, Tao PANG, Qiang GUO, Zhe LI, Xu LIU, Yongjun CAI, Markus W SIGRIST, Brain CALSHAW, Chimin SHU. Stable Gaseous Isotope Measurement Method Based on Highly Sensitive Laser Absorption Spectroscopy and Its Applications（Invited）[J]. Acta Photonica Sinica, 2023, 52(3): 0352108
- Acta Photonica Sinica
- Vol. 52, Issue 3, 0352108 (2023)
Fig. 1. The schematic of the TDLAS with multi-pass cell
Fig. 2. Description of cavity transmission and diagram of spot distributions of regular spherical mirrors
Fig. 3. The schematic of the principle of the cavity ring-down spectroscopy（CRDS）
Fig. 4. The simulated absorption spectrum of 5% H2O and 500 ppm CO2 isotope gases based on HITRAN database
Fig. 5. The simulated absorption spectrum of vapor isotope gases
Fig. 6. Temperature control box structure diagram and internal temperature distributions simulation results
Fig. 7. Flow chart of temperature and pressure control and fuzzy adaptive PID cycle control algorithm
Fig. 8. The continuous measurement results of temperature and pressure
Fig. 9. The experimental system based on TDLAS technology and its appearance diagram
Fig. 10. Simulation results of CH4 absorption spectra at different pressures near 1 658 nm
Fig. 11. The measurement results of CH4 isotope and Allan variance analysis of system stability
Fig. 12. The experimental system based on ICOS technology and its appearance diagram
Fig. 13. The direct absorption signals of 16O12C16O，16O13C16O and 16O12C18O
Fig. 14. The experimental system based on CRDS technology and its appearance diagram
Fig. 15. The photograph of cross-mode spot with infrared camera
Fig. 16. CRDS measurement results
Fig. 17. ICOS measurement results and isotopic abundance values
Fig. 18. Methane absorption spectra and isotopic abundance values
Fig. 19. Water isotope measurement results
Fig. 20. Comparison of isotopic values of water vapor with IRMS and Picarro instrument
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Table 1. Reference spectrums are selected for isotopic gases
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Table 2. Measurement Results from IRMS and LAS system
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