FMCW birefringent fiber strain sensor with two forward-coupled beams

Michael Campbell; Gang Zheng; Peter A. Wallace

doi:10.1117/12.248501

26 August 1996 FMCW birefringent fiber strain sensor with two forward-coupled beams

Michael Campbell, Gang Zheng, Peter A. Wallace

Proceedings Volume 2783, Micro-Optical Technologies for Measurement, Sensors, and Microsystems; (1996) https://doi.org/10.1117/12.248501
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

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.

Citation Download Citation

Michael Campbell, Gang Zheng, and Peter A. Wallace "FMCW birefringent fiber strain sensor with two forward-coupled beams", Proc. SPIE 2783, Micro-Optical Technologies for Measurement, Sensors, and Microsystems, (26 August 1996); https://doi.org/10.1117/12.248501

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KEYWORDS

Sensors

Polarization

Fiber optics sensors

Phase shifts

Mirrors

Semiconductor lasers

Environmental sensing

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