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Proceedings Paper

Analysis of FBG reflection spectra under uniform and non-uniform transverse loads
Author(s): Luigi Fazzi; Aydin Rajabzadeh; Alberto Milazzo; Roger M. Groves
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Paper Abstract

Loads applied transversely on the external surface of waveguides change their circular cross-sectional geometry generating birefringence. Due to this effect the reflected spectrum of a Fibre Bragg grating (FBG) undergoes a splitting of the single peak of the Bragg wavelength. In this work, we employed the Transfer Matrix Method (TMM) for x- and y-polarized wave-modes to model the uniform FBG reflection spectra for uniform and non-uniform transverse loads. We also performed experimental measurements for two different transverse load scenarios. The load profiles chosen for these experiments were applied on the FBG sensor through a block of steel and a roll bearing pin. Then, the modelled and experimental results were compared resulting in good agreement of 85% (on average). Finally, during the roll bearing pin loading test, different responses were observed depending how the FBGs were surface mounted. To investigate this, the glue layer influence on the reflected spectrum was further studied experimentally.

Paper Details

Date Published: 27 March 2019
PDF: 9 pages
Proc. SPIE 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019, 109701X (27 March 2019); doi: 10.1117/12.2513795
Show Author Affiliations
Luigi Fazzi, Delft Univ. of Technology (Netherlands)
Palermo Univ. (Italy)
Aydin Rajabzadeh, Delft Univ. of Technology (Netherlands)
Alberto Milazzo, Palmero Univ. (Italy)
Roger M. Groves, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 10970:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019
Jerome P. Lynch; Haiying Huang; Hoon Sohn; Kon-Well Wang, Editor(s)

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