Dr. Aleksandra Jedynska Profile

Dr. Aleksandra Jedynska

at TNO

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Proceedings Article | 27 March 2019 Paper

Test results of lateral load insensitive FBGs embedded in composites to suppress spectral distortion

Lun-Kai Cheng, Ronald Hagen, Amir Vosteen, Bilim Atli-Veltin, Peter Toet, Freek Molkenboer, Floris van Kempen, Oana van der Togt, Aleksandra Jedynska, Rob Jansen

Proceedings Volume 10970, 109701Y (2019) https://doi.org/10.1117/12.2513761

KEYWORDS: Fiber Bragg gratings, Composites, Structured optical fibers, Distortion, Carbon, Optical fibers, Manufacturing, Reflection, Glasses, Finite element methods

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Composite constructions are indispensable in current and future society. Fiber Bragg Gratings (FBGs) embedded in composite need to be carefully aligned with the material fibers to reduce inhomogeneous lateral load exerted onto the FBG which occurs due to the inhomogeneous nature of composite materials. Inhomogeneous load causes distortion of the reflection spectrum. We proposed to solve the FBG spectral distortion by incorporating a dedicated design structure inside the optical fiber. This allows the FBG to sense the strain in the axial direction accurately regardless of the optical fiber alignment with respect to the composite matrix. In this paper, the basic design will be discussed and the results of the first prototype of this structured fiber will be presented. Prototype FBGs are embedded in different composite samples of various thicknesses and materials (glass or carbon fiber based). The spectrum before and after curing is measured and direct comparisons are performed with embedded standard commercial FBG to verify the improvement. Effects of depth of the embedding and FBG direction with respect to the composite material fiber are investigated. Bending and tension tests are performed to ensure the special FBG in the structured fiber has the directional sensitivity to the strain applied. During all experiments, the special FBG is found to have a better or comparable spectrum than the standard FBGs. The improvement varies for the different tests. This can be caused by the unknown orientation of the structure inside the fiber. According to the first FEM analysis, this affects the effectiveness depending on the detail design of the structure. Information of the FEM analysis will be used to further optimize the design and for the development of a prototype.

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