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Optical Engineering

Fiber Bragg gratings as transient thermal gradient sensors
Author(s): Drew A. Hackney; Kara J. Peters; Richard J. Black; Joannes M. Costa; Behzad Moslehi
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Paper Abstract

We experimentally subject a fiber Bragg grating to an unknown, variable temperature gradient. We use the full-spectral response of the grating to determine the magnitude of the gradient over the length of the grating via the full width at quarter maximum bandwidth. The experimental bandwidth and spectrum deformation were compared with a numerical model consisting of an analytical heat transfer model, a finite element analysis model, and the transfer matrix (T-matrix) method. The numerical model showed excellent agreement with the experimental results when the T-matrix method was modified to include the slope of the gradient in addition to the magnitude of the gradient.

Paper Details

Date Published: 16 November 2016
PDF: 10 pages
Opt. Eng. 55(11) 114102 doi: 10.1117/1.OE.55.11.114102
Published in: Optical Engineering Volume 55, Issue 11
Show Author Affiliations
Drew A. Hackney, North Carolina State Univ. (United States)
Kara J. Peters, North Carolina State Univ. (United States)
Richard J. Black, Intelligent Fiber Optic Systems Corp. (United States)
Joannes M. Costa, Intelligent Fiber Optic Systems Corp. (United States)
Behzad Moslehi, Intelligent Fiber Optic Systems Corp. (United States)

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