Analysis of the Side-lobes of FBG Reflection Spectra From Matrix Cracks in Composites

Rajabzadeh, Aydin; Heusdens, Richard; Hendriks, Richard C.; Groves, Roger M.

doi:10.1364/ofs.2018.tue97

Cited by 1 publication

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References 7 publications

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“…In this study, expanding work first presented at the 26th Optical Fiber Sensors Conference, OFS-26 [12], we will analyse the effect of transverse cracks on FBG reflection spectra from a new perspective. We will present a mathematical model for the analysis of FBG reflection spectra from sensors that are affected by transverse cracks, and we will show that the information regarding the formation of cracks lies within the side-lobes of these spectra.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Transverse Matrix Cracks in Composite Materials Using Fibre Bragg Grating Sensors

Rajabzadeh

Heusdens

Hendriks

et al. 2019

J. Lightwave Technol.

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In this paper we propose a novel approach to characterise barely visible transverse matrix cracks in composite structures using fibre Bragg grating optical sensors. Matrix cracks are one of the most prevalent types of damage in composite structures, and detecting them in the internal layers of composites has remained a challenge. In this paper, we will show that the formation of cracks in the internal layers of composite structures alters the side-lobes of the reflection spectra of FBG sensors by adding new harmonics to them. We argue that the spread and the location of these harmonics depends on both the mechanical properties of the composite material and the location of the crack along the length of the FBG sensor. Via computer simulations and experimental measurements we validate our hypotheses, and the results are in agreement with our model.

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Section: Introductionmentioning

confidence: 99%