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Proceedings Paper

Fiber optic Bragg intra-grating strain gradient sensing
Author(s): Michel LeBlanc; Shang Yuan Huang; Raymond M. Measures
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Paper Abstract

By looking at the full reflection spectrum of a Bragg grating strain sensor, one cal tell when strain gradients are presented along the sensing length and estimate their magnitude. Furthermore, if certain conditions of monotonicity of the strain profile along the sensor are met, complex strain profile shapes can be interpreted from the grating's spectrum. We show how this technique can be applied to the study of the strain transfer at the tip of an embedded fiber. A fiber embedded in epoxy was loaded up to 2.5% strain, which induced fiber end-zone damage. The strain profile along the fiber, estimated from the reflection spectrum of the grating, gives details about the failure process which could not be obtained by any other known method.

Paper Details

Date Published: 20 April 1995
PDF: 12 pages
Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); doi: 10.1117/12.207668
Show Author Affiliations
Michel LeBlanc, Univ. of Toronto (Canada)
Shang Yuan Huang, Univ. of Toronto (Canada)
Raymond M. Measures, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 2444:
Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation
William B. Spillman Jr., Editor(s)

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