Beibei Si, Jiaxiang Liu, Ganshang Si, Zhengang Li, Zhiqiang Ning, Yonghua Fang. Methane Gas Detection Based on Anti-Resonant Hollow-Core Fiber[J]. Acta Optica Sinica, 2022, 42(19): 1906003
- Acta Optica Sinica
- Vol. 42, Issue 19, 1906003 (2022)
Fig. 1. Schematic diagram of ARROW model
Fig. 2. Absorption spectrum of methane
Fig. 3. Fiber cross section and relationship between fiber wavelength and loss. (a) Fiber cross section; (b) relationship between fiber wavelength and loss
Fig. 4. Fiber coupling device. (a) Schematic diagram; (b) physical diagram
Fig. 5. Structural diagram of detection device
Fig. 6. Second harmonic signal
Fig. 7. Concentration calibration curve
Fig. 8. Measurement accuracy of device. (a) Distribution of methane concentration; (b) histogram of concentration frequency distribution
Fig. 9. Amplitude change curve of second harmonic signal
Fig. 10. Allan variance curve
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