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Based on spectrum principle and analyzing the infrared absorption spectrum of methane, a kind of optical fiber methane gas sensor and its system are developed. DFBLD(Distributed feedback laser diode) in 1 300 nm waveband is used as illuminant and phase-detecting technology is used to cany out harmonic wave detecting the concentration of methane. The sensitivity can arrive at 10-5. Experiments results show that the performance targets of the sensor such as sensitivity can basically satisfy the requests of methane detection.
Based on spectrum principle and analyzing the infrared absorption spectrum of methane, a kind of optical fiber methane gas sensor and its system are developed. DFBLD (Distributed feedback laser diode) in 1 300 nm waveband is used as illuminant and phase-detecting technology is used The cany out harmonic wave detecting the concentration of methane. The sensitivity can arrive at 10-5. Experiments results show that the performance targets of the sensor such as sensitivity can substantially required the methane detection.