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

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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.
Original languageEnglish
Article number2266
Issue number10
Number of pages14
Publication statusPublished - 2017


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

Cite this

Stern, Y., London, Y., Preter, E., Antman, Y., Diamandi, H. H., Silbiger, M., Adler, G., Levenberg, E., Shalev, D., & Zadok, A. (2017). Brillouin optical correlation domain analysis in composite material beams. Sensors, 17(10), [2266].