Fiber Monitoring Network of Methane Concentration Based on Space Division Multiplexing in Coal Mine
ZHANG Ji-long1, 2, WANG Peng2, WANG Zhi-bin1, 2, LI Xiao1, 2*, WANG Zhi-wen2
1. National Key Laboratory of Science and Technology on Electronic Test and Measurement, Taiyuan 030051, China 2. Engineering Technology Research Center of Shanxi Province for Opto-Electronic Information and Instrument, North University of China, Taiyuan 030051, China
Abstract：Methane explosion accidents occur frequently, and accurate and real-time detection and early warning of methane concentration are the effective means of preventing these accidents. The research was based on the spectrum absorption properties of methane, and a near-infrared tunable DFB laser diode of 1.65 μm wave band was used. With the mode-hopping features of laser diode, a differential absorption of double-wavelength and single-fiber optical sensor network was designed. Sixteen methane sensors were multiplexed in this system with space division multiple access technology and optical switch, and the key technologies of anti-dust in gas absorption cell were researched. All signals were gathered by the PCI data acquisition card，and information of each way was analyzed and displayed with virtual instrument. The results of experiment show that the method can reach the sensitivity of 0.05% even without using a phase-locked amplifier and the absorption light path is only 10 centimeters. Long-time accuracy and stability of all sensors could meet the practical demands, and the response time of each sensor was less than 1 seconds. With the replacement of lasers, the network can be used for the real-time detection of other gases.
张记龙1，2，王 鹏2，王志斌1，2，李 晓1，2*，王智文2 . 基于空分复用的矿井瓦斯浓度光纤检测网络研究[J]. 光谱学与光谱分析, 2010, 30(06): 1722-1726.
ZHANG Ji-long1, 2, WANG Peng2, WANG Zhi-bin1, 2, LI Xiao1, 2*, WANG Zhi-wen2 . Fiber Monitoring Network of Methane Concentration Based on Space Division Multiplexing in Coal Mine. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(06): 1722-1726.
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