光纤布拉格光栅传感器与基于应变模态理论的结构损伤识别

Fiber Bragg Grating Sensor and Recognition of Structural Damage Based on Strain Modal Theory

介绍了光纤布拉格光栅传感器和应变模态理论的基本原理 ,综述了应变模态理论用于结构损伤识别的研究现状。由于基于应变模态理论的结构损伤识别受到传统应变检测手段的制约 ,因此 ,寻求一种高精度应变检测手段已成为应变模态理论用于现场结构损伤识别的前提。根据光纤光栅所具有的高精度绝对测量、准分布式数字测量、抗电磁干扰、构造简单、使用方便等诸多优点 ,提出用具有高精度的光纤光栅应变检测技术代替传统的应变片测量技术 。

The basic principles of Fiber Bragg Grating (FBG) sensor and the recognition of structural damage based on strain modal theory are introduced.The research progress of strain modal theory are briefly summarized.At the same time,the importance of seeking a strain measurement method with high precision is emphasized in applying the strain modal theory to the recognition of structural damage,owing to the limitation of traditional strain measurement ways of recognizing the structural damage based on the strain modal theory.To overcome the deficiency of the traditional strain measurement ways,the paper suggests a new technology,which have absolute measurement with high precision,quasi-distribution digital measurement,anti-electromagnetic interfere,simple structure,convenient of use and so on,replaces the strain gauge with the FBG strain detection technology,and discusses the possibility of utilizing the technology for the strain modal analysis.