An optical fiber remote methane gas on-line monitoring system
We report on a fiber optic infrared methane gas detection system,which is based on distributed feedback (DFB) laser diode at around 1665 nm.The gas sensor is made of normal telecommunication fiber,signal also transmitted via fiber link,hence free of electricity and intrinsically safe.The system is capable of self-referencing of the absorption line and self-correction of the intensity fluctuation.It can be used for remote monitoring over 10 km range.The injection current of the DFB laser diode is modulated with a saw-tooth wave to provide wavelength scanning across a methane absorption line at around 1665 nm.The methane gas sensor has been designed to minimize the effect of dust,moisture and vibration.It is constructed with fiber pigtailed graded index (GRIN) lenses and operating in reflection mode for convenient access.This instrument is currently undergoing site trials in a coal mine in Shandong province,China.Long term accuracy of 0.05% has been achieved.This new remote online methane monitoring system exhibits significant potential for coal mine methane gas monitoring in the future.
Optical fiber sensor Methane gas sensor Coal mine safety
Ni Jiasheng Li Yanfang Liu Tongyu Wang Qian Han Xiaohua
Laser Institute,Shandong Academy of Science,Jinan,Shandong province,China 250014
国际会议
The 2007 International Conference on Mine Hazards Prevention and Control(2007矿山灾害预防与控制国际学术会议)
青岛
英文
672-676
2007-10-17（万方平台首次上网日期，不代表论文的发表时间）