Temperature and strain effects discrimination inside composite materials with embedded weakly tilted fibre Bragg grating

D. Kinet; D. Garray; P. Mégret; C. Caucheteur

doi:10.1117/12.2025841

20 May 2013 Temperature and strain effects discrimination inside composite materials with embedded weakly tilted fibre Bragg grating

D. Kinet, D. Garray, P. Mégret, C. Caucheteur

Author Affiliations +

Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87942R (2013) https://doi.org/10.1117/12.2025841
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

Abstract

Fibre Bragg gratings (FBGs) are strain sensors that can be embedded into composite materials, without affecting their mechanical performances. In this study, we report the use of a short and weakly tilted FBG inscribed in a single mode highly germanium doped photosensitive optical fibre to discriminate, with a good spatial resolution, strain and temperature effects for structural health monitoring (SHM) application. The transmission spectrum of a weakly tilted FBG (TFBG) presents three regions of interest: the Bragg resonance, the ghost mode resonance and all other cladding mode resonances that are not exploited in this work. We make use of the differential temperature sensitivity of the Bragg mode and the ghost mode to discriminate between temperature and strain effects inside composite materials.

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D. Kinet, D. Garray, P. Mégret, and C. Caucheteur "Temperature and strain effects discrimination inside composite materials with embedded weakly tilted fibre Bragg grating", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87942R (20 May 2013); https://doi.org/10.1117/12.2025841

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