Fiber optic acoustic emission sensor based on a fused tapered coupler

Crispin T. M. Doyle; Rongshen Chen; Tongyu Liu; Gangtie Zheng; Gerard Franklyn Fernando

doi:10.1117/12.472633

27 June 2002 Fiber optic acoustic emission sensor based on a fused tapered coupler

Crispin T. M. Doyle, Rongshen Chen, Tongyu Liu, Gangtie Zheng, Gerard Franklyn Fernando

Proceedings Volume 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems; (2002) https://doi.org/10.1117/12.472633
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

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.

Citation Download Citation

Crispin T. M. Doyle, Rongshen Chen, Tongyu Liu, Gangtie Zheng, and Gerard Franklyn Fernando "Fiber optic acoustic emission sensor based on a fused tapered coupler", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); https://doi.org/10.1117/12.472633

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