摘要
本文介绍了一种基于瑞利背向散射的高密度分布式光纤传感技术,并使用该技术测量了碳纤维增强FRP单向层合板静态弯曲状态下的应变分布,研究了不同情况下的应变分布规律。按照实验中光纤的铺设方法,测试分辨率设为2mm,每个单向层合板可以得到480个有效应变数据,应变大小与外加载荷呈正线性关系。同时在单向层合板上粘贴光纤布拉格光栅(FBG)传感器与分布式光纤传感器进行对比,二者测试结果一致,说明分布式光纤传感技术可以准确监测整个结构的应变,实现分布式测量,并且可以对FRP结构关键区域进行缺陷定位。
A High-density distributed fiber optic sensing technique based on Rayleigh backscattering effect is introduced here.This technique can assess the strain along the entire optical fiber length with a resolution in the submilimeter range.It was used to measure the strain of carbon fiber reinforced composite laminates under static bending tests,and the regularity of strain distribution under different conditions were studied.According to the experimental pavement mothed of the optic fiber,with 2 mm spatial resolution,480points' strain profiles were generated for each laminate,and positive linear relationship between loads and strain size was observed.Fiber Bragg Gratings(FBGs)were bonded to the laminates co-located with the distributed sensors for comparison.Very good agreement is obtained between strain measures for the laminates with the two kinds of sensors.It shows that the distributed sensing technique enables to monitor the strain very detailed in a global mapping of the entire structure, realizing distributed measurement,and demonstrates its high potential for damage detection of composite materials.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2013年第S1期247-250,共4页
Acta Materiae Compositae Sinica
基金
国家商用飞机制造工程技术研究中心创新基金项目<复合材料热压罐成型工艺热传递中的关键技术问题研究>SAMC12-JS-15-012
关键词
高密度
分布式
光纤传感器
应变监测
缺陷定位
复合材料
high-density
distributed
fiber optic sensors
strain monitoring
damage detection
composite materials
