1. All-Optical Photoacoustic Spectroscopy-Based Dual-Component Greenhouse Gas Analyzer
- Author
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Guo, Min, Zhou, Mengda, Yang, Beilei, Zhao, Xinyu, Li, Chenxi, Yu, Qing, Zhang, Guangyin, Fang, Zebo, and Chen, Ke
- Abstract
To achieve high sensitivity detection of dual-component greenhouse gases carbon dioxide and methane simultaneously, a multimechanism synergistic enhanced all-optical photoacoustic spectroscopy gas analyzer is presented. The acoustic resonance of the photoacoustic cell and the mechanical resonance of a fiber-optic cantilever acoustic sensor are used to enhance the photoacoustic signals of the dual-component gas. The optimized multipass beam reflection structure enhances the effective excitation power of the dual-component gas. The highly sensitive detection of carbon dioxide and methane at dual-frequency operating points is realized by dual-channel laser modulation combined with dual-input digital lock-in amplification technology. The Allan–Werle deviation analysis results show that with a 100 s average time, the minimum detection limits of carbon dioxide and methane are 76.5 and 1.9 ppb, respectively. The corresponding normalized noise equivalent absorption (NNEA) coefficients are 3.1 × 10–10and 2.9 × 10–10cm–1W/Hz1/2, respectively.
- Published
- 2024
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