研究了一种利用放大自发辐射(ASE)光源线性段做边缘滤波器进行光纤Bragg光栅(FBG)解调的新方法,可实现在传感波长变化3 nm范围内的波长解调。系统采用了全光纤结构,无需机械部件调谐,提高了光纤传感系统的解调速度及稳定性,具有反应迅速快、性能价格比高等优点,应变测量范围可达2 500με。
A new demodulation method for fiber Bragg grating sensing signal,which uses the edge of linear filter of an amplified spontaneous emission(ASE) light source,is designed and realized.Using this method the linear demodulation with a bandwidth of 3 nm is achieved.This high-speed demodulation system is an all-fiber system.The advantages of this system are rapid response and high ratio of cost performance.The strain measuring range is about 2 500 με.