中国激光, 2005, 32 (4): 549, 网络出版: 2006-06-01
光纤光栅滤波的瓦斯传感系统的研究
Study on Fiber Methane Sensing System Using FBG Filters
摘要
差分吸收法是进行瓦斯远距离监测的重要方法,根据瓦斯在近红外波段的吸收特性,报道了一种新型的远距离光纤瓦斯传感系统。采用1.3 μm超辐射发光二极管为光源,利用光纤布拉格光栅(FBG)优良的窄带滤波特性实现了对瓦斯的差分吸收测量。和传统的干涉滤光片相比,光纤光栅滤波器插入损耗低、制备简单。系统具有全光纤化、结构简单、工作距离远、稳定性好的特点。工作距离10 km,测量灵敏度为0.1%,是瓦斯爆炸极限的2%。
Abstract
Differential absorption method is an important method for methane remote monitoring. Based on the methane absorption spectrum in near-infrared region, a novel kind of fiber remote sensing system utilizing fiber Bragg grating (FBG) filters and 1.31 μm superradiance light-emitting diode (SLED) was developed for real time absorption measurement. The highly sensitive technique was achieved employing the two-wavelength differential absorption method. FBG has low insert loss and can be produced easily compared with dielectric interference filters. This system has a number of advantages such as all-fiber sensor, high sensibility, simply construct and long-distance measurement. The measurement sensitivity is 0.1%. It is 2% of the lower explosion limit of methane density in air.
林枫, 蔡海文, 夏志平, 耿健新, 陈刚, 瞿荣辉, 方祖捷, 王向朝. 光纤光栅滤波的瓦斯传感系统的研究[J]. 中国激光, 2005, 32(4): 549. 林枫, 蔡海文, 夏志平, 耿健新, 陈刚, 瞿荣辉, 方祖捷, 王向朝. Study on Fiber Methane Sensing System Using FBG Filters[J]. Chinese Journal of Lasers, 2005, 32(4): 549.