Tongyu Liu, Zhaowei Wang, Zhen Li, Guangxian Jin, Jiqiang Wang, Jie Hu, Yanfang Li, Yubin Wei, Yanong Ning, Qingshan Yang. Advance of Laser and Fiber Optic Sensors for Applications of Coal Mine Safety Monitoring and Early Warning[J]. Laser & Optoelectronics Progress, 2021, 58(13): 1306016
- Laser & Optoelectronics Progress
- Vol. 58, Issue 13, 1306016 (2021)
Fig. 1. Absorption spectra of methane gas in the 1650 nm region
Fig. 2. Physical map. (a) Laser CH4 sensor module; (b) laser CH4 portable instrument
![Laser CO detection data via 2.3 μm absorption spectral analysis[47]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Laser CO detection data via 2.3 μm absorption spectral analysis[47]
Fig. 4. Absorption peaks of CO, CH4, and CO2 gases in the 1566 nm wavelength region
Fig. 5. Absorption peaks of CO and CH4 gas in the 2.33 μm wavelength region
Fig. 6. Absorption spectra of CO gas with 4.6 μm wavelength region
Fig. 7. Fiber wind velocity sensor. (a) Schematic of fiber hot-wire wind velocity sensor; (b) wavelength of hot-wire sensor changes with temperature and time[62]
Fig. 8. Photo of fiber wind velocity sensor installation at coal mine site
Fig. 9. Measurement data of fiber wind velocity sensor at the coal mine site
Fig. 10. Data of successful hot zone detection and positioning of coal mine goaf in Northeast China in March 2019
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