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Proceedings Paper

Effect of temperature on CO2 absorption spectrum near 1432nm
Author(s): Honglian Li; Shuai Di; Wenjing Lv; Yaqing Jia; Lide Fang
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Paper Abstract

As the most important greenhouse gas, CO2 has caused a lot of climate change problems. Therefore, the measurement of CO2 is of great significance. Based on the tunable diode laser absorption spectroscopy (TDLAS), the effect of temperature on the absorption spectrum of CO2 was studied. A DFB laser with the center wavelength of 1430 nm was selected. The absorption line of CO2 near 1432 nm at different temperatures (293-373 K, interval 10K) was measured by wavelength modulation spectroscopy (WMS). By comparing S-G filtering method, FFT filtering method and P-F filtering method, the spectral data was preprocessed, and the optimal preprocessing method was determined. The measurement error caused by noise was reduced effectively, the second harmonic signal of CO2 at different temperatures was obtained, and the influence of temperature on the absorption spectrum of CO2 was analyzed. The goodness of fit of temperature and signal strength under different orders was evaluated. Finally, the second-order polynomial fitting was chosen as the optimal model of CO2. The experimental results complement and improve the existing database to ensure the accuracy of CO2 inversion, which has an important reference significance for the measurement of CO2 in practical applications.

Paper Details

Date Published: 12 March 2020
PDF: 5 pages
Proc. SPIE 11438, 2019 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology, 1143814 (12 March 2020); doi: 10.1117/12.2555129
Show Author Affiliations
Honglian Li, Hebei Univ. (China)
Shuai Di, Hebei Univ. (China)
Wenjing Lv, Hebei Univ. (China)
Yaqing Jia, Hebei Univ. (China)
Lide Fang, Hebei Univ. (China)


Published in SPIE Proceedings Vol. 11438:
2019 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology
Guohai Situ; Xun Cao; Wolfgang Osten, Editor(s)

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