An easy-realizable fiber methane gas sensor with high sensitivity is demonstrated based on the near infrared spectral absorption of methane.The modulating characteristic of diode laser and the principle of harmonic detection are analysed.The mathematical model of sensor is built up.Distribute feed back laser diode is used as a light source.The gas cell used is made up with grin lens.The referenced optical path and referenced gas cell are appended so that the center wavelength of the diode laser is locked in the absorption peak of methane.Gas concentration harmonic detection is achieved by light source modulation.The experiment result of the methane detection system is shown.
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褚衍平,张景超,管立君.光纤甲烷气体传感器的研究[J].激光与红外,2008,38(7):684~687 CHU Yan-ping, ZHANG Jing-chao, GUAN Li-jun. Research on Fiber Methane Gas Sensor[J]. LASER & INFRARED,2008,38(7):684~687