摘要
提出了一种基于柔性铰链多级增敏的光纤应变传感器。通过将光纤光栅粘贴在具有桥式位移放大结构的基片上来提高灵敏度。介绍了该传感器的应变增敏原理,理论分析了应变传感器的应变传递模型,基于此理论模型,进行了有限元仿真分析。利用万能试验机对该传感器进行了应变标定实验。为验证该传感器是否可以准确监测结构的应变,进行了混凝土试件的现场拉伸试验。试验结果表明,该传感器具有良好的增敏特性,适用于混凝土结构的实时应变监测。
A fiber optic strain sensor with multi-stage sensitization using flexible hinges is proposed.By attaching fiber gratings to a substrate with a bridge displacement amplification structure,sensitivity is enhanced.The principle of strain sensitization is introduced,and a strain transmission model is theoretically analyzed and validated through finite element simulation.Calibration experiments using a universal testing machine and field tensile tests on concrete beams verify the sensor’s accuracy in real-time strain monitoring of concrete structures,demonstrating its excellent sensitization characteristics.
作者
宋涵
赵光耀
张锋
王振
张昆桥
SONG Han;ZHAO Guangyao;ZHANG Feng;WANG Zhen;ZHANG Kunqiao(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan 430070,China;CNNC Wuhan Nuclear Power Operation Technology Co.,Ltd.Wuhan 430000,China)
基金
湖北省核电运行工程技术研究中心应用基础科研资助项目(NO.B210507)
关键词
光纤光栅
应变增敏
桥式位移结构
结构监测
fiber grating
strain sensitization
bridge displacement structure
structural monitoring
