Brillouin optical correlation domain analysis in composite material beams

Yonatan Stern, Yosef London, Eyal Preter, Yair Antman, Hilel Hagai Diamandi, Maayan Silbiger, Gadi Adler, Eyal Levenberg, Doron Shalev, Avi Zadok

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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.

Original languageEnglish
Article number2266
Issue number10
StatePublished - Oct 2017

Bibliographical note

Funding Information:
Acknowledgments: This research was supported in part by the Chief Scientist Office, Israel Ministry of Economy, through the MAGNETON program. The authors thank R. Cohen, O. Shlomi, L. Efraim and A. Froochzad of Bar-Ilan University for assistance in data acquisition.

Publisher Copyright:
© 2017 by the authors. Licensee MDPI, Basel, Switzerland.


  • Brillouin optical correlation domain analysis
  • Brillouin sensors
  • Composite beams
  • Composite materials
  • Optical fiber sensors
  • Strain measurements
  • Structural health monitoring


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