Fengxiang Ma, Yu Tian, Ke Chen, Bo Zhang, Chenxi Li, Guangyin Zhang, Min Guo, Beilei Yang, Yue Zhao. Detection Technology of H2S and CO2 Based on Fiber Amplifier Enhanced Photoacoustic Spectroscopy[J]. Acta Optica Sinica, 2021, 41(7): 0703002
- Acta Optica Sinica
- Vol. 41, Issue 7, 0703002 (2021)
Fig. 1. Absorption lines of H2S and CO2 in the near-infrared region and the simulated 2f signals. (a) Absorption lines of H2S and CO2 in the near-infrared region; (b) simulated 2f signals of H2S and CO2
Fig. 2. Structure diagram and photo of the fiber amplification enhanced photoacoustic spectroscopy based gas detection system. (a) Structure diagram; (b) photo
Fig. 3. Relationship between photoacoustic signal amplitude and modulation current. (a) H2S; (b) CO2
Fig. 4. Responses of this system to 2f signals generated by H2S/N2 gas mixtures with different H2S volume fractions. (a) 2f signals generated by H2S/N2 gas mixtures with different H2S volume fractions; (b) peak values of the 2f signals as a function of H2S volume fractions
Fig. 5. Responses of this system to 2f signals generated by CO2/N2 gas mixtures with different CO2 volume fractions. (a) 2f signals generated by CO2/N2 gas mixtures with different CO2 volume fractions; (b) peak values of the 2f signals as a function of CO2 volume fractions
Fig. 6. Interference of CO2 on H2S absorption. (a) Interference absorption spectrum; (b) long-term detection of H2S response and high-concentration CO2 interference
Fig. 7. Allan analysis results of H2S and CO2. (a) Allan deviation analysis to H2S when the photoacoustic cell is full of air, inset is long term equivalent H2S concentration; (b) Allan deviation analysis to CO2 when the photoacoustic cell is full of air, inset is long term equivalent CO2 concentration
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Table 1. Mixed gas measurement and correction results
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