Jingyi LIU, Yue PAN, Lu YAO, Liting YU, Hui LI, Ruifeng KAN. Mid-infrared laser absorption spectroscopy CO2 spectrometer[J]. Optics and Precision Engineering, 2024, 32(9): 1330
- Optics and Precision Engineering
- Vol. 32, Issue 9, 1330 (2024)
Fig. 1. Absorption line of CO2 in range of 2-5 μm
Fig. 2. Absorbance curves of CO2， CH4 and H2O
Fig. 3. Schematic diagram of atmospheric CO2 detection devices
Fig. 4. Atmospheric CO2 detection devices
Fig. 5. Data processing flowchart
Fig. 6. Raw data and its fitting curve
Fig. 7. Voigt fitting and absorbance curves and their residual plots
Fig. 8. measured concentration and calibrated concentration results
Fig. 9. Linear relationship between measured concentration and calibrated concentration and residual results
Fig. 10. Allan variance method
Fig. 11. Comparison of TDLAS-CO2 self-developed instrument and commercial instrument
Fig. 12. Comparison data of CO2 instrument concentration
Fig. 13. Atmospheric CO2 concentration over eight-day period
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Table 1. CO2 absorption line parameters at 4.219 μm
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Table 2. Physical parameter of atmospheric CO2 detection system
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