Semi-analytical calculation model for multi-wavelength laser gas detection

Ruixue Li; Haoxu Wang; Guo Jin; Zhenfeng Hu; Lingchao Kong

doi:10.1117/12.2617875

15 February 2022 Semi-analytical calculation model for multi-wavelength laser gas detection

Ruixue Li, Haoxu Wang, Guo Jin, Zhenfeng Hu, Lingchao Kong

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121666O (2022) https://doi.org/10.1117/12.2617875
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology is widely used in the field of absorption spectrum gas detection because of high sensitivity, fast response speed, non-invasive and long distance measurement. The TDLAS direct absorption method uses the law of light absorption to obtain the concentration of gases. When measuring the concentration of multiple gases, mutual infection between different kinds of gases occurs, which makes the decoupling process time-consuming. In our previous work, we presented a multi-wavelength QCL laser system based on spatial parallel beam combinations of multiple QCL lasers, which could be used to detect three or even more kinds of gases. However, there is no theoretical model to calculate the gas concentration when multiple gases are detected simultaneously. This paper proposes a semi-analytical calculation model for multi-wavelength QCL lasers to detect multiple gases which can be realized by simple matrix operations, and avoid the time consuming decoupling process when three or more kinds of gases are measured simultaneously. It is suitable for rapid concentration analysis when detecting multiple gases online at the same time, and realizes the online analysis of multiple gases concentration.

Citation Download Citation

Ruixue Li, Haoxu Wang, Guo Jin, Zhenfeng Hu, and Lingchao Kong "Semi-analytical calculation model for multi-wavelength laser gas detection", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121666O (15 February 2022); https://doi.org/10.1117/12.2617875

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KEYWORDS

Gases

Quantum cascade lasers

Absorption

Signal detection

Gas lasers

Laser applications

Sensors

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