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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1.3μm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%。
Differential absorption method is an important method for long-distance gas monitoring. According to the absorption characteristics of gas in the near infrared band, a new type of long-distance optical fiber gas sensor system is reported. Using 1.3μm superluminescent diode as light source, differential absorption measurement of gas was realized by using the excellent narrow-band filter characteristic of fiber Bragg grating (FBG). Compared with the traditional interference filter, the insertion loss of fiber grating filter is low and its preparation is simple. The system has all-fiber, simple structure, long working distance, good stability. Working distance of 10 km, measurement sensitivity of 0.1%, gas explosion limit of 2%.