Research on decoupling Cl2 and PM slow-changing noise in open-path UV-DOAS detection

Tonghua Jia; Guangxu Cheng; Sheng Chen; Jiacong Yang

doi:10.1117/12.3045656

13 December 2024 Research on decoupling Cl₂ and PM slow-changing noise in open-path UV-DOAS detection

Tonghua Jia, Guangxu Cheng, Sheng Chen, Jiacong Yang

Author Affiliations +

Proceedings Volume 13494, AOPC 2024: Optical Spectroscopy and Applications; 1349403 (2024) https://doi.org/10.1117/12.3045656
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

Ultraviolet differential optical absorption spectroscopy (UV-DOAS) has been successfully applied in long-distance detection of polluting gases in atmosphere. However, the traditional DOAS method will fail if gas absorption signals are annihilated in noisy signals. To address this issue, chlorine (Cl₂) was selected as the target gas. In this paper, a DOAS experimental system for open-path detection was developed, and an algorithm for decoupling slow-changing signals of Cl₂ and particle matters (PM) was proposed. Firstly, the weight analysis of full spectrum band was carried out based on synergy interval partial least squares (Si-PLS). As a result, low SNR band, Cl₂ feature absorption band and non-feature band were matched according to their contribution. Secondly, an equivalent scattering model was established to obtain the light intensity attenuation of PM in the non-feature band. Finally, the signal decoupling was realized by deducting the PM attenuation spectrum from the absorption band of Cl₂. This study provides a new feasible method for large scale detection of Cl₂ leakage in open environments.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Tonghua Jia, Guangxu Cheng, Sheng Chen, and Jiacong Yang "Research on decoupling Cl₂ and PM slow-changing noise in open-path UV-DOAS detection", Proc. SPIE 13494, AOPC 2024: Optical Spectroscopy and Applications, 1349403 (13 December 2024); https://doi.org/10.1117/12.3045656

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