基于单片机实现的光纤光栅应力传感器

提出了一种用单片机控制光介质薄膜干涉滤波器探测光纤光栅波长偏移量的方法,并构建了对外界应力实时检测的光纤光栅应力传感系统。实验中采用了一种超磁致伸缩材料(GMM) ,使光纤布拉格光栅( FBG)产生有效的B ragg波长偏移,用控制电流来调控FBG的应变和Bragg波长偏移;电流加到1A～5A之间时,反射峰的中心波长的偏移量随所加电流呈线性增加的趋势,偏移量达到1. 10nm ( 1551. 94nm～1553. 04nm) 。该系统具有对应力测量结果分辨率高、精度高等优点。

A Fiber Bragg Grating Strain Sensor Based on Micro-controller

A novel method to control thin-film filter and detect the Bragg wavelength offsets of fiber Bragg grating (FBG) with microcontroller has been demonstrated.The real-time measurements of the strains have been experienced within a FBG strain sensing system.A high performance giant magnetostrictive material (GMM) is utilized to produce significant Bragg wavelength shifts in FBGs,When current changes from 1A to 5A,the offsets of the center wavelength reaches 1.1nm (1551.94nm~1553.04nm),and it increases linearly with the current.Programmable current are used to controllably strain and shift of the Bragg wavelength of the FBGs.This system has many advantages,such as high resolution and high precision.