Weak absorption detection method under broadband interference based on linear wavelength modulation spectroscopy

Renjie Li; Jing Li; Yan Liu; Fei Li; Xin Lin; Xilong Yu; Dongdong Meng

doi:10.1117/12.2656227

22 December 2022 Weak absorption detection method under broadband interference based on linear wavelength modulation spectroscopy

Renjie Li, Jing Li, Yan Liu, Fei Li, Xin Lin, Xilong Yu, Dongdong Meng

Author Affiliations +

Proceedings Volume 12459, Sixth International Symposium on Laser Interaction with Matter; 124590Z (2022) https://doi.org/10.1117/12.2656227
Event: Sixth International Symposium on Laser Interaction with Matter (LIMIS 2022), 2022, Ningbo, China

Abstract

In complex environments, the measurement of trace gases is inevitably greatly affected by broadband absorption (such as water absorption in combustion exhaust). Based on the study of high-order harmonics in linear wavelength modulation spectroscopy, a method for detecting target gases (trace, weak absorption) in the presence of broadband absorption interference is proposed. Theoretical analysis and numerical simulation work give the applicable conditions of this method. The effectiveness of this method is verified by NO2 measurement of combustion exhaust gas. This study proves the application potential of this method for the measurement of trace gases under broadband absorption interference.

Citation Download Citation

Renjie Li, Jing Li, Yan Liu, Fei Li, Xin Lin, Xilong Yu, and Dongdong Meng "Weak absorption detection method under broadband interference based on linear wavelength modulation spectroscopy", Proc. SPIE 12459, Sixth International Symposium on Laser Interaction with Matter, 124590Z (22 December 2022); https://doi.org/10.1117/12.2656227

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