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Proceedings Paper

FMCW birefringent fiber strain sensor with two forward-coupled beams
Author(s): Michael Campbell; Gang Zheng; Peter A. Wallace
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Paper Abstract

This paper describes a new birefringent fiber strain sensor which is based on the FMCW technique. The sensor comprises a single length of elliptical core birefringent fiber with a mirror attached at the far end and a mode coupler in the middle. The strain variation of the fiber sensing probe can be measured by detecting the phase shift of the beat signal which is produced by two forward-coupled polarization mode beams. The experimental results demonstrated that the sensor has many advantages, such as (1) high resolution (2 microstrain), (2) large dynamic measurement range (5000 microstrain), (3) large signal intensity and good signal contrast, (4) long and length-adjustable sensing probe, (5) long and environment-insensitive lead-in and lead-out fiber, (6) simple signal processing, and (7) low cost.

Paper Details

Date Published: 26 August 1996
PDF: 4 pages
Proc. SPIE 2783, Micro-Optical Technologies for Measurement, Sensors, and Microsystems, (26 August 1996); doi: 10.1117/12.248501
Show Author Affiliations
Michael Campbell, Glasgow Caledonian Univ. (United Kingdom)
Gang Zheng, Glasgow Caledonian Univ. (United Kingdom)
Peter A. Wallace, Glasgow Caledonian Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 2783:
Micro-Optical Technologies for Measurement, Sensors, and Microsystems
Olivier M. Parriaux, Editor(s)

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