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Sensors 2014, 14(4), 7394-7419; doi:10.3390/s140407394

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

1
Electromagnetism and Telecommunication Department, Faculty of Engineering, University of Mons, Boulevard Dolez 31, 7000 Mons, Belgium
2
Department of Electrical and Computer Engineering, Evans Hall Newark 202, University of Delaware, Newark, DE 19716-3130, USA
3
Source Photonics, 20550 Nordhoff Street, Chatsworth, CA 91311, USA
*
Author to whom correspondence should be addressed.
Received: 10 February 2014 / Revised: 4 April 2014 / Accepted: 18 April 2014 / Published: 23 April 2014
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [991 KB, uploaded 21 June 2014]   |  

Abstract

Nowadays, smart composite materials embed miniaturized sensors for structural health monitoring (SHM) in order to mitigate the risk of failure due to an overload or to unwanted inhomogeneity resulting from the fabrication process. Optical fiber sensors, and more particularly fiber Bragg grating (FBG) sensors, outperform traditional sensor technologies, as they are lightweight, small in size and offer convenient multiplexing capabilities with remote operation. They have thus been extensively associated to composite materials to study their behavior for further SHM purposes. This paper reviews the main challenges arising from the use of FBGs in composite materials. The focus will be made on issues related to temperature-strain discrimination, demodulation of the amplitude spectrum during and after the curing process as well as connection between the embedded optical fibers and the surroundings. The main strategies developed in each of these three topics will be summarized and compared, demonstrating the large progress that has been made in this field in the past few years. View Full-Text
Keywords: composite materials; sensors; optical fibers; fiber Bragg gratings; structural health monitoring; temperature; strain; interrogation techniques; connectors composite materials; sensors; optical fibers; fiber Bragg gratings; structural health monitoring; temperature; strain; interrogation techniques; connectors
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Kinet, D.; Mégret, P.; Goossen, K.W.; Qiu, L.; Heider, D.; Caucheteur, C. Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions. Sensors 2014, 14, 7394-7419.

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