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Fiber Methane Gas Sensor and Its Application in Methane Outburst Prediction in Coal Mine |
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| Authors: | Jia-Sheng Ni Jun Chang Tong-Yu Liu Yan-Fang Li Yan-Jie Zhao Qian Wang |
| Affiliation: | 1. Laser Institute, Shandong Academy of Science, Jinan, 250014, China;School of Information Science and Technology, Shandong University, Jinan, 250100, China 2. School of Information Science and Technology, Shandong University, Jinan, 250100, China 3. Laser Institute, Shandong Academy of Science, Jinan, 250014, China |
| Abstract: | Fiber optic methane gas detecting system based on distributed feedback (DFB) laser wavelength scanning technique is demonstrated. Wavelength scan of methane absorption peak at 1665.9 nm is realized by saw tooth modulation of current which is injected to DFB laser. A reference methane gas cell is used to find the methane absorption peak around 1666 rim, and normalization is used to reduce the outside affection such as power drift, fiber loss. Concentration is got by arithmetic processing absorption coefficient of the methane gas. In-situ test is carried out in coal mine and long time precision of 0.05% is achieved. Some spot data of coal mine is introduced. By the system, methane outburst can be measured. |
| Keywords: | Methane outburst prediction optical absorption wavelength scan |
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