Haolong WU, Yamin WANG, Mengmeng TAO, Sheng WANG, Guohua LI, Jingfeng YE, Zhenjie WU, Lijun WANG. Measurement and Analysis of CO2 Hyperspectral Absorption Spectroscopy at High Pressure in the 2 µm Band[J]. Acta Photonica Sinica, 2024, 53(7): 0730001
- Acta Photonica Sinica
- Vol. 53, Issue 7, 0730001 (2024)
Fig. 1. Distribution of CO2 absorbance near 1.96 μm at room temperature （8% CO2 mole fraction， 120 cm absorption length）
Fig. 2. Schematic of CO2 hyperspectral absorption measurement experiment
Fig. 3. Typical raw signals of CO2 hyperspectral absorption at different pressures
Fig. 4. Baseline extraction of CO2 hyperspectral absorption signal utilizing the weak absorption region
Fig. 5. Wavelength calibration of CO2 hyperspectral absorption signal at 152 kPa
Fig. 6. Simultaneous fitting result of CO2 hyperspectral absorption data at 152 kPa
Fig. 7. Direct baseline fitting processing result of CO2 hyperspectral absorption data at 426 kPa
Fig. 8. Simultaneous fitting result of CO2 hyperspectral absorption data at 426 kPa
Fig. 9. Simultaneous fitting result of CO2 hyperspectral absorption data at 932 kPa
Fig. 10. Comparison of the theoretical and measured spectra of CO2 absorption at different pressures
Fig. 11. P， T and X variation curves with gauge pressure retrieved from hyperspectral absorption spectra.
Fig. 12. Relative error of P， T and X retrieved from hyperspectral absorption spectra at different pressures.
Fig. 13. Comparison of wideband and narrowband inversion of CO2 absorption spectra
Fig. 14. Curves of 1 965.98 nm spectral absorption area variation with pressure for wideband and narrowband fit
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