Deng Yao, Tang Wen, Li Zhenghui, Zhong Shangwen, Zou Lichang, Lu Zhimin, Lin Jian, Yao Shunchun. Gas Concentration Inversion Method Based on Calibration of Direct Absorption Peak Value[J]. Laser & Optoelectronics Progress, 2021, 58(3): 3300021
- Laser & Optoelectronics Progress
- Vol. 58, Issue 3, 3300021 (2021)
Fig. 1. Line intensity of CO2, H2O, and O2 in the range from 6326.2 cm-1 to 6330.5 cm-1 at 296 K
Fig. 2. Simulated absorption spectra of CO2 in the range from 6326.2 cm-1 to 6330.5 cm-1 at 298 K and 101325 Pa
Fig. 3. A linear fitting between simulated absorption peak value and concentration
Fig. 4. Variation of simulated absorption peak value with temperature
Fig. 5. Experimental setup
Fig. 6. Reference light intensity obtained by the cubic polynomial of non-absorption area
Fig. 7. Measured absorption spectra of each concentration of CO2 at 298 K
Fig. 8. Calibration model of absorption peak value and concentration
Fig. 9. Fitting curves between absorption peak value and temperature
Fig. 10. Comparison of absolute relative error of CO2 concentration by two methods
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Table 1. Concentration inverted by absorption peak value calibration model
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Table 2. Inversion results of CO<sub>2</sub> concentration at different temperatures
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