一种新型FBG动态应变解调系统

A New FBG Based Dynamic-Strain Interrogation System

提出并演示了一种基于光纤布拉格光栅(FBG)三角形滤波器的动态应变解调系统。通过周期啁啾和折射率调制变迹,制作了FBG三角形滤波器,并利用该滤波器实现了一种新型的FBG动态应变解调方案。通过与传统应变片测量结果进行比较,结果表明,该系统能够准确地实现动态应变测量。由于系统紧凑、无源,因此可被制成便携式的解调模块。

A new dynamic-strain interrogation system based on a fiber Bragg grating（FBG） triangular filter is proposed and experimentally demonstrated in this paper. Through a chirp in grating period and an apodization in index modulation,we fabricated a FBG triangular filter,and utilized this filter to demodulate the dynamic-strain signal of another wavelength-matched FBG sensor. By comparing with the results measured by a commercial strain-gauge,this system is proved to have a good performance in the measurement of dynamic strain. Since the system is compact and passive,it is able to be integrated as a portable demodulation module.