Hao Liu, Mai Hu, Xiang Chen, Hao Deng, Zhenyu Xu, Qiang Wang, Xiang Li, Ruifeng Kan, Xianyi Zhang. Sensitive Detection of CH4 and CO2 Using Frequency-Division-Multiplexing Based Quartz-Enhanced Photoacoustic Spectroscopy[J]. Acta Optica Sinica, 2021, 41(14): 1430003
- Acta Optica Sinica
- Vol. 41, Issue 14, 1430003 (2021)
Fig. 1. Simulated absorption spectra of different gases at different wavelengths. (a) 1654 nm; (b) 2004 nm
Fig. 2. Structural diagram of system
Fig. 3. Frequency response curve of QTF
Fig. 4. Spectral comparison of raw photoacoustic signals for CH4 and CO2 at different laser modulation frequencies
Fig. 5. Comparison of second harmonic signal amplitude under single beam and combined beam. (a) CH4; (b) CO2
Fig. 6. Second harmonic signal amplitudes of CH4 and CO2 at different scanning frequencies. (a) CH4; (b) CO2
Fig. 7. Second harmonic signal amplitudes of CH4 and CO2 decoded at different modulation current amplitudes. (a) CH4; (b) CO2
Fig. 8. Second harmonic signal amplitudes of CH4 and CO2 with different concentrations. (a) CH4; (b) CO2
Fig. 9. Second harmonic signal amplitude versus concentration for CH4 and CO2. (a) CH4; (b) CO2
Fig. 10. Allan deviation analysis of system. (a) CH4; (b) CO2
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