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Synchronous detection of CO2 and CH4 gas absorption spectroscopy based on TDM and optimized adaptive Whittaker-Henderson filtering algorithm

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Abstract

A cavity ring-down spectroscopy (CRDS) system based on the time-division multiplexing (TDM) and an improved Whittaker-Henderson (W-H) filtering algorithm was proposed to synchronous detect of methane (CH4) and carbon dioxide (CO2) gas absorption spectroscopy. The mechanical optical switch was used to quickly switch distributed feedback (DFB) lasers with different wavelengths in the optical path.And the adaptive W-H filtering algorithm combined with convolutional neural network (CNN) could quickly and accurately obtain the best weight parameters to achieve effective denoising of absorption spectrum.In addition, the gradient concentration of CH4 and CO2weredetected and the limit of detection (LOD) of CRDS system was studied.The results of experiment demonstrated that the system could detect CO2 and CH4 in real time and had good stability. Allan deviation analysis shows that the LOD of CH4 and CO2 are 8 ppb and 0.85 ppm under the average number of 1. The LOD of CH4 and CO2 can be optimized to 2 ppb and 0.16 ppm under the optimal average number. In short, the proposed system had high sensitivity, good stability and could measure various gases synchronously, which had important application potential in the field of gas monitoring.

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Acknowledgements

This work is partly supported by the National Natural Science Foundation of China (61905001), and University Natural Science Research Project of Anhui Province (2023AH050066, 2023AH050088).

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Authors and Affiliations

  1. Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, 230601, China

    Letian Xu, Reiwei Tang, Xiaoyuan Sun, Benli Yu, Guosheng Zhang & Sheng Zhou

  2. Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education, School of Physics and Opto Electronic engineering, Anhui University, Hefei, 230601, China

    Letian Xu, Reiwei Tang, Xiaoyuan Sun, Benli Yu, Guosheng Zhang & Sheng Zhou

  3. Hebei Zi Yue Machinery Equipment Co. LTD, Shijiazhuang, 050000, China

    Wenfeng Kang

  4. School of Materials Science and Engineering, Anhui University, Hefei, 230601, China

    Guosheng Zhang

Authors
  1. Letian Xu
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  2. Reiwei Tang
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  3. Wenfeng Kang
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  4. Xiaoyuan Sun
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  5. Benli Yu
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  6. Guosheng Zhang
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  7. Sheng Zhou
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Contributions

L.X Writing the origin manuscript, experiment analysis; R.T Investigation; W.K Equipment provided; X.S Software; B.Y Project administration; G.Z Review, editing; S.Z Methodology, review and editing; All authors reviewed the manuscript.

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Correspondence to Guosheng Zhang or Sheng Zhou.

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Xu, L., Tang, R., Kang, W. et al. Synchronous detection of CO2 and CH4 gas absorption spectroscopy based on TDM and optimized adaptive Whittaker-Henderson filtering algorithm. Appl. Phys. B 130, 102 (2024). https://doi.org/10.1007/s00340-024-08241-w

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