Optical backscatter reflectometer to study the response of cascaded FBGs embedded in fibre reinforced polymer composites during flexural tests

Damien Kinet, Didier Garray, Alexey V. Faustov, François Narbonneau, Patrice Mégret, Christophe Caucheteur

Research outputpeer-review


Due to their high mechanical and corrosion resistance and their small dimensions, optical fibre sensors and more particularly fibre Bragg gratings have demonstrated their high potential in the composite material field for monitoring purpose when there are placed under constrain, vibration or temperature variation. In this paper, we evaluate the capability of an Optical Backscatter Reflectometer (OBR) to address two configurations of sensors. The first one is with FBGs of different wavelengths distributed along a unique optical fibre. The second one consists in a high number of identical Fibre Bragg Grating (FBG) sensors cascaded in a single optical fibre and embedded in fibre reinforced polymer composites. In this last case, the optical fibre was placed in such a way that the set of FBGs yields a mapping of the flexural strain applied on the composite sample. For this, the Bragg wavelength evolution of the different FBGs subject to flexion (three and four-points bending) is computed from the OBR trace. This equipment being used in these two special FBGs sensors distribution, we compare them and we present advantages and drawbacks of each others.

Original languageEnglish
Title of host publicationOptical Sensing and Detection III
PublisherSPIE - Society of Photo-optical Instrumentation Engineers
ISBN (Print)9781628410891
StatePublished - 2014
Externally publishedYes
Event2014 - SPIE Photonics Europe : Optical Sensing and Detection III - Brussels
Duration: 14 Apr 201417 Apr 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference2014 - SPIE Photonics Europe
Abbreviated titleSPIE

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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