NOVEL SPECTRUM ABSORPTION OPTICAL FIBER METHANE SENSOR

摘要

＜正＞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.