On the improvement of strain measurements with FBG sensors embedded in unidirectional composites

Gilmar Ferreira Pereira, C. Frias, H. Faria, O. Frazão, A.T. Marques

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Optical fibre Bragg grating (FBG) sensors are now quite established and widely used in strain measurements of composites. However, insufficient understanding of the limitations of the embedment and measuring techniques often lead to inaccurate and inconclusive results. In this study, a novel method to improve the reliability and accuracy of the strain measurements on unidirectional composites using embedded FBG sensors was successfully developed. Using a carbon/epoxy prepreg system, test specimens were manufactured with longitudinally embedded FBG sensors. The combined behaviour of the sensors and the host material was characterized and a calibration rule (correction factor) was determined for the chosen material. The consistency of the results with both theoretical and empirical assumptions suggests that the proposed method is applicable to a wide range of FBG sensors and host materials.
Original languageEnglish
JournalPolymer Testing
Volume32
Issue number1
Pages (from-to)99-105
ISSN0142-9418
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Smart materials
  • Optical fibre Bragg Grating sensors
  • Non-destructive testing
  • Structural health monitoring

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