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

Brillouin Optical Correlation Domain Analysis in Composite Material Beams

Faculty of Engineering and Institute for Nano-Technology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 5290002, Israel
Xenom Ltd., 4 Gluska st., Rishon LeTzion 7565004, Israel
Department of Civil Engineering, Technical University of Denmark, Kongens Lyngby 2800, Denmark
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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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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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