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- Title
Synchronous detection of CO<sub>2</sub> and CH<sub>4</sub> gas absorption spectroscopy based on TDM and optimized adaptive Whittaker-Henderson filtering algorithm.
- Authors
Xu, Letian; Tang, Reiwei; Kang, Wenfeng; Sun, Xiaoyuan; Yu, Benli; Zhang, Guosheng; Zhou, Sheng
- 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.
- Subjects
GAS absorption &; adsorption; CONVOLUTIONAL neural networks; ADAPTIVE filters; IMAGE denoising; CAVITY-ringdown spectroscopy; OPTICAL switches; SPECTROMETRY
- Publication
Applied Physics B: Lasers & Optics, 2024, Vol 130, Issue 6, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-024-08241-w