Xiao-xiao CHENG, Jian-guo LIU, Liang XU, Han-yang XU, Ling JIN, Ming XUE. IR Spectral Inversion of Methane Concentration and Emission Rate in Shale Gas Backflow[J]. Spectroscopy and Spectral Analysis, 2021, 41(12): 3717
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 12, 3717 (2021)
Fig. 1. Optical path diagram of FTIR monitoring system
Fig. 2. Experimental measuring system
Fig. 3. Infrared spectral inversion process
(a): Characteristic absorption spectra of methane;(b): Measured spectrum;(c): Fit spectrum and original spectrum;(d): Residual spectrum
(a): Characteristic absorption spectra of methane;(b): Measured spectrum;(c): Fit spectrum and original spectrum;(d): Residual spectrum
Fig. 4. Sewage discharge real-time map
Fig. 5. Methane measurement during an hour
(a): Concentration; (b): Emission rate
(a): Concentration; (b): Emission rate
Fig. 6. Methane measurement in the day
(a): Concentration; (b): Emission rate
(a): Concentration; (b): Emission rate
Fig. 7. Methane observed continually for 80 hours
(a): Concentration; (b): Emission rate
(a): Concentration; (b): Emission rate
Fig. 8. Correlation of concentrations obtained by using FTIR and handheld instrument
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