Multiple damage detection techniques by dynamic strain measurements using FBG sensors

Hyun-Jun Park; Ki-Young Koo; Chung-Bang Yun

doi:10.1117/12.715678

10 April 2007 Multiple damage detection techniques by dynamic strain measurements using FBG sensors

Hyun-Jun Park, Ki-Young Koo, Chung-Bang Yun

Proceedings Volume 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007; 65293J (2007) https://doi.org/10.1117/12.715678
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

The development of smart sensors for structural health monitoring and damage detection has been advanced remarkably in recent years. Nowadays fiber optic sensors, especially fiber Bragg grating (FBG) sensors, have attracted many researchers' interest for their attractive features, such as multiplexing capability, durability, lightweight and electromagnetic interference immunity. In this paper, two damage detection approaches by dynamic strain measurements using FBG sensors are presented. They are the modal strain-flexibility and the modal strain energy methods. An experimental study was conducted to investigate the feasibility of the methods for damage detection and localization. It has been found that the strain-based approaches using dynamic strain measurements from FBG sensors can successfully detect and localize multiple small damages near the sensors. However, the damage detection range of the present short-gage FBG sensors seems rather narrow. Long-gage FBG sensors would be a possible solution.

Citation Download Citation

Hyun-Jun Park, Ki-Young Koo, and Chung-Bang Yun "Multiple damage detection techniques by dynamic strain measurements using FBG sensors", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65293J (10 April 2007); https://doi.org/10.1117/12.715678

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