基于光纤激光器的光纤Bragg光栅传感技术

The FBG Sensing Technology Based on Fiber Laser

分析了掺Er光纤激光器(EDFL)的基本原理和光纤Bragg光栅(FBG)传感机理,组建了一种基于环形腔EDFL的FBG传感系统,其中FBG既作为滤波器起波长选择、又充当传感器起感测外界温度压力变化的作用。实验研究了经过温度增敏工艺处理过的FBG温度特性,传感系统温度分辨率优于0.3℃。换用荧光光源和经悬臂梁粘贴增敏处理的FBG,对比了在相同作用力下采用该系统前、后输出传感信号的光谱形状,结果表明,该技术方法可以有效消除FBG的啁啾对传感信号的影响,方法简单、信噪比高,适用于中远距离的FBG传感测量系统。

Analyzing the principle of erbium-doped fiber laser（EDFL） and the sensing mechanism of fiber Bragg grating （FBG） ,the sensing system fo FBG based on ring EDFL was established. In this system,the FBG acted as not only a filter but a sensor to choice wavelength and sense the change of temperature or pressure. The temperature characteristics of the FBG sensor, that was processed by temperature sensitivity enhancing technique,was studied by experiment, and the temperature resolution was better than 0. 3 ~C. After insteading of using the fluorescence source and the FBG that was pasted on cantilever beam,the spectrum shape of output sensing signal was compared under idential acting force. The technical method could eliminate the influence of FBG＇s chirp to sensing signal effectively. This method had the features of simplicity and high signal-to-noise ratio,and suited for the FBG sensing system with middle and long distance.