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Proceedings Paper

Transverse strain sensitivity of fiber Bragg grating sensors
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Paper Abstract

This article presents an integrated formulation for the calculation of the spectral response of a fiber Bragg grating sensor embedded in a host material system, as a function of the loading applied to the host structure. In particular, the calculation of the transverse strain sensitivity of a fiber Bragg grating sensor through the calculation of the change in effective index (or indices) of refraction of the fiber cross-section due to the applied load is presented in detail. For the calculation of the fiber propagation constants, a two-step finite element formulation is used moeling the optical, geometric and material properties of the cross-section. Once the propagation constants and principle optical axes are known along the fiber, a modified transfer matrix method is applied to calculate the spectral response of the FBG. It is shown that the inclusion of the change in index of refraction throughout the cross-section yields close agreement with previous methods. However the current method provides the potential to evaluate the effects of high strain gradients across the optical fiber core for some loading applications.

Paper Details

Date Published: 16 May 2005
PDF: 12 pages
Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); doi: 10.1117/12.598844
Show Author Affiliations
Mohanraj Prabhugoud, North Carolina State Univ. (United States)
Kara Peters, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 5758:
Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems
Eric Udd; Daniele Inaudi, Editor(s)

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