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Proceedings Paper

Phase-based Bragg intra-grating sensing of strain gradients
Author(s): Myo Myint Ohn; Simon Sandgren; Shang Yuan Huang; Robert Maaskant; Raoul Stubbe; Bengt Sahlgren; Raymond M. Measures; Helge Storoy
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Paper Abstract

Light reflected from chirped fiber Bragg gratings possess both phase and amplitude information which is unique. In this paper we report for the first time the use of the relative phase to determine the strain-induced linear chirp. By measuring this intramodal (chromatic) dispersion induced on the incident wave, the wavelength dependent penetration depth and therefore the strain gradient can be found by using a closed-form approximation. Moreover, the error can be reduced by selecting the appropriate grating properties like the writing induced chirp and the index variation parameters.

Paper Details

Date Published: 20 April 1995
PDF: 9 pages
Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); doi: 10.1117/12.207667
Show Author Affiliations
Myo Myint Ohn, Univ. of Toronto (Canada)
Simon Sandgren, Institute of Optical Research (Sweden)
Shang Yuan Huang, Univ. of Toronto (Canada)
Robert Maaskant, Univ. of Toronto (Canada)
Raoul Stubbe, Institute of Optical Research (Sweden)
Bengt Sahlgren, Institute of Optical Research (Sweden)
Raymond M. Measures, Univ. of Toronto (Canada)
Helge Storoy, Norwegian Technical Institute (Norway)

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

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