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Proceedings Paper

Fiber optic acoustic emission sensor based on a fused tapered coupler
Author(s): Crispin T. M. Doyle; Rongshen Chen; Tongyu Liu; Gangtie Zheng; Gerard Franklyn Fernando
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Paper Abstract

This paper introduces a new type of fiber-optic acoustic emission (AE) sensor, based on a fused tapered 2x2 coupler. Laser light is injected into one input fiber and variations in the splitting ratio, caused by the passage of an ultrasonic pulse through the coupling region, are measured via a differential detection scheme. The sensor was designed to be directly compatible with an existing AE instrumentation system (the MISTRAS system from Physical Acoustics). Sensors were mounted on the surface of and embedded within glass-reinforced polyester laminates. They were excited with simulated AE signals and their performance was compared to that of a conventional piezoelectric AE transducer. The characteristics of the response of the fiber-optic sensor were similar to those of a commercial piezoelectric transducer. A signal-to noise ratio of 45 dB was achieved.

Paper Details

Date Published: 27 June 2002
PDF: 8 pages
Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); doi: 10.1117/12.472633
Show Author Affiliations
Crispin T. M. Doyle, Cranfield Univ. (United Kingdom)
Rongshen Chen, Protodel Ltd. (United Kingdom)
Tongyu Liu, Bookham Technology Plc. (United Kingdom)
Gangtie Zheng, Harbin Institute of Technology (United Kingdom)
Gerard Franklyn Fernando, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4694:
Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems
Daniele Inaudi; Eric Udd, Editor(s)

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