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Proceedings Paper

Localized long-gauge-length fiber optic sensor demodulated with wavelength tuning technique
Author(s): Ning Yao Fan; Shang Yuan Huang; Raymond M. Measures
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Paper Abstract

A novel single-ended fiber optic sensor capable of making absolute displacement measurements over arbitrarily long distance (a few centimeters to meters) is demonstrated. The sensor's gauge length is defined by an in-fiber broad bandwidth Bragg grating and a mirror coated at the end of the same fiber. This sensor has been demodulated optoelectronically by means of a laser wavelength scanning technique. The absolute measurement of perturbation is achieved by measuring the perturbation induced optical path difference (OPD) changes with respect to the OPD of a reference interferometer that can be isolated from environmental perturbations and remain constant. This sensor is well suited for structural applications, especially the measurement of hoop stress changes in concrete columns that are wrapped within layers of advanced composite material for rehabilitation or strengthening.

Paper Details

Date Published: 6 June 1997
PDF: 6 pages
Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997); doi: 10.1117/12.275756
Show Author Affiliations
Ning Yao Fan, Univ. of Toronto (Canada)
Shang Yuan Huang, Univ. of Toronto (Canada)
Raymond M. Measures, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 3042:
Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation
Richard O. Claus, Editor(s)

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