Jinguo CHAI, Shancheng YU, Dandan ZHU, Lixin KANG, Zhengtai WANG, Lulu XU, Yuxuan REN, Kai TONG. Detection method for calibration of gas concentrations based on absorption peaks in frequency domain[J]. Journal of Applied Optics, 2024, 45(1): 142
- Journal of Applied Optics
- Vol. 45, Issue 1, 142 (2024)
Fig. 1. CO2 absorption line ranging from 6 313 cm−1 to 6 410 cm−1
Fig. 2. Selected CO2 absorption lines
Fig. 3. Flow chart of Levenberg-Marquardt algorithm
Fig. 4. Schematic diagram of experimental setup of wavelength scanning method
Fig. 5. Schematic diagram of test system
Fig. 6. Absorption signal
Fig. 7. Signal processing process
Fig. 8. Relationship of CO2 absorption values and concentration
Fig. 9. Fitting residuals
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