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

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 (CH 4 ) and carbon dioxide (CO 2 ) gas absorption spectroscopy. The mechanical optical switch was us...

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Veröffentlicht in:Applied physics. B, Lasers and optics Lasers and optics, 2024-06, Vol.130 (6), Article 102
Hauptverfasser: Xu, Letian, Tang, Reiwei, Kang, Wenfeng, Sun, Xiaoyuan, Yu, Benli, Zhang, Guosheng, Zhou, Sheng
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Sprache:eng
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Zusammenfassung: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 (CH 4 ) and carbon dioxide (CO 2 ) 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 CH 4 and CO 2 weredetected and the limit of detection (LOD) of CRDS system was studied.The results of experiment demonstrated that the system could detect CO 2 and CH 4 in real time and had good stability. Allan deviation analysis shows that the LOD of CH 4 and CO 2 are 8 ppb and 0.85 ppm under the average number of 1. The LOD of CH 4 and CO 2 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.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-024-08241-w