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Sensors 2017, 17(10), 2266; https://doi.org/10.3390/s17102266

Brillouin Optical Correlation Domain Analysis in Composite Material Beams

1
Faculty of Engineering and Institute for Nano-Technology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 5290002, Israel
2
Xenom Ltd., 4 Gluska st., Rishon LeTzion 7565004, Israel
3
Department of Civil Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
4
Doron Shalev Engineering Ltd., 23 Bar-Kochba st., Bnei-Brak 5126002, Israel
*
Author to whom correspondence should be addressed.
Received: 8 September 2017 / Revised: 29 September 2017 / Accepted: 30 September 2017 / Published: 2 October 2017
(This article belongs to the Special Issue Sensor Technologies for Health Monitoring of Composite Structures)
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Abstract

Structural health monitoring is a critical requirement in many composites. Numerous monitoring strategies rely on measurements of temperature or strain (or both), however these are often restricted to point-sensing or to the coverage of small areas. Spatially-continuous data can be obtained with optical fiber sensors. In this work, we report high-resolution distributed Brillouin sensing over standard fibers that are embedded in composite structures. A phase-coded, Brillouin optical correlation domain analysis (B-OCDA) protocol was employed, with spatial resolution of 2 cm and sensitivity of 1 °K or 20 micro-strain. A portable measurement setup was designed and assembled on the premises of a composite structures manufacturer. The setup was successfully utilized in several structural health monitoring scenarios: (a) monitoring the production and curing of a composite beam over 60 h; (b) estimating the stiffness and Young’s modulus of a composite beam; and (c) distributed strain measurements across the surfaces of a model wing of an unmanned aerial vehicle. The measurements are supported by the predictions of structural analysis calculations. The results illustrate the potential added values of high-resolution, distributed Brillouin sensing in the structural health monitoring of composites. View Full-Text
Keywords: structural health monitoring; optical fiber sensors; Brillouin sensors; composite materials; composite beams; strain measurements; Brillouin optical correlation domain analysis structural health monitoring; optical fiber sensors; Brillouin sensors; composite materials; composite beams; strain measurements; Brillouin optical correlation domain analysis
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Stern, Y.; London, Y.; Preter, E.; Antman, Y.; Diamandi, H.H.; Silbiger, M.; Adler, G.; Levenberg, E.; Shalev, D.; Zadok, A. Brillouin Optical Correlation Domain Analysis in Composite Material Beams. Sensors 2017, 17, 2266.

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