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YUAN Kang-jie, ZHOU Yue-ting, GONG Ting, YAN Xiang, SUN Xiao-cong, QIU Xuan-bing, LI Chuan-liang. Multispectral analysis based on cavity ring-down spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2024-0207
Citation: YUAN Kang-jie, ZHOU Yue-ting, GONG Ting, YAN Xiang, SUN Xiao-cong, QIU Xuan-bing, LI Chuan-liang. Multispectral analysis based on cavity ring-down spectroscopy[J]. Chinese Optics. doi: 10.37188/CO.2024-0207

Multispectral analysis based on cavity ring-down spectroscopy

cstr: 32171.14.CO.2024-0207
Funds:  Supported by National Natural Science Foundation of China (No. 62475182, No. 52076145); National Key R&D Program of China (No. 2023YFF0718100); Special Funding for Shanxi Provincial Science and Technology Innovation Talent Team (No. 202304051001034); Key R&D Program of Shanxi Province (No. 202302150101017); Science and Technology Activities Project for Overseas Students in Shanxi Province (No. 20230031); Shanxi Provincial Fund-raising Funding Project for Returning Overseas Students (No. 2023-151); Science and Technology Innovation Program for Higher Education Institutions in Shanxi Province (No. 2024L227)
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  • Corresponding author: clli@tyust.edu.cn
  • Received Date: 14 Nov 2024
  • Accepted Date: 26 Jan 2025
  • Available Online: 27 Sep 2025
  • Laser absorption spectroscopy (LAS) has been widely applied in atmospheric monitoring, industrial production, medical diagnostics, and other fields due to its high sensitivity, rapid response, and real-time online detection capabilities. However, spectral overlap interference remains a major challenge in LAS. In this study, a multispectral analysis approach based on cavity ring-down spectroscopy (CRDS) is proposed. A CRDS gas detection system was developed using a custom-designed cage-type Fabry-Pérot cavity, and seven acetylene (C2H2) absorption lines in the range of 6452 cm−1 to 6453 cm−1 were selected for investigation. Experimental results demonstrate that the system can accurately measure and fit the C2H2 multispectral lines, achieving a minimum detectable limit of 3.517×10−8 cm−1, corresponding to a minimum detectable volume fraction of 4.37 ×10−6 for C2H2 gas. Additionally, the pressure in the cavity was precisely measured with a calibrated high-precision vacuum gauge, and the pressure-broadening effect in the absorption spectroscopy was used to calculate the pressure-broadening coefficients for three absorption lines, with relative deviation below 0.04. This study provides a novel method for multispectral analysis in LAS, improving measurement accuracy and broadening its applicability.

     

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