基于光纤布拉格光栅传感器的光纤光栅智能夹层试验研究

Experimental Study of Fiber Grating Smart Layer System Based on Fiber Bragg Grating Sensors

传感元件与复合材料的一体化是智能结构研究的最终目标之一。设计一种具有自诊断功能的标准化、模块化光纤智能夹层系统,正是实现这种一体化最有潜力的技术途径。采用聚酰亚胺薄膜制作了基于光纤布拉格光栅(FBG)传感器的光纤光栅智能夹层,对智能夹层中光纤布拉格光栅传感器的应变、温度特性进行了标定试验,并建立了基于光纤布拉格光栅传感器光纤光栅智能夹层的应变、温度测量模型。试验表明,智能夹层内布拉格光栅波长偏移与应变、温度之间具有良好的线性关系。不过在温度测量时,必须考虑被埋入结构的热膨胀效应。利用光纤光栅智能夹层内光纤布拉格光栅传感器网络和先进信息处理技术,可以建立结构损伤主动、在线和实时监测系统。

One of the final research goals for smart structures is to integrate sensing elements with composite materials. It is the most potential technical approach that the standardization and modularization of fiber optic smart layer system with function of self-diagnosing is designed. The fiber grating smart layer （FGSL） with embedded fiber Bragg grating （FBG） sensors is fabricated using dielectric substrate of polyimide. The calibration test of embedded FBG sensors is conducted and the models of strain measurements and temperature measurements for FBG sensors embedded inside FGSL are set up. The experimental results show that the wavelength shift of Bragg grating is excellently linear with strain and temperature by embedded FBG sensors, but it is noted that the thermal characterization of the structure built-in FGSL should be investigated. The active and real time monitoring system would be established by fiber Bragg grating networks embedded inside FGSL and advanced information treatment technology.