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Proceedings Paper

Ultrasonic condition monitoring of composite structures using a low-profile acoustic source and an embedded optical fiber sensor
Author(s): S. Gareth Pierce; Wieslaw J. Staszewski; Anthony Gachagan; I. R. James; Wayne R. Philip; Keith Worden; Brian Culshaw; Alistair McNab; Geoffrey R. Tomlinson; Gordon Hayward
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Paper Abstract

The purpose of this paper is to provide a concise introduction to the developments and recent findings of a BRITE-EURAM program of work (BRE2.CT94-0990 <SISCO>, structurally integrated system for the comprehensive evaluation of composites). The aim of the program has been to develop an acoustic/ultrasonic based structural monitoring system for composite structures using material compatible sensors. Since plate-like structures have been investigated, it has been a requirement to utilize the propagation of ultrasonic Lamb waves through the sample materials. Preliminary investigations utilized conventional piezo-electric sources coupled to the sample via perspex wedges. The Lamb waves generated by these sources were monitored using either a fully embedded or surface mounted optical fiber sensors. The system was tested with a variety of different carbon and glass fiber reinforced panels, and the interaction of the lamb waves with different defects in these materials was monitored. Conventional signal processing allowed the location of defects such as impact damage sites, delaminations and holes. Subsequent investigations have endeavored to refine the system. This paper reports the development of advanced wavelet based signal processing techniques to enhance defect visibility, the optical connectorization of composite panels, and the development of flexible low profile acoustic sources for efficient Lamb wave generation.

Paper Details

Date Published: 6 June 1997
PDF: 12 pages
Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); doi: 10.1117/12.275667
Show Author Affiliations
S. Gareth Pierce, Univ. of Strathclyde (United Kingdom)
Wieslaw J. Staszewski, Univ. of Sheffield (United Kingdom)
Anthony Gachagan, Univ. of Strathclyde (United Kingdom)
I. R. James, GEC Alsthom (United Kingdom)
Wayne R. Philip, Univ. of Strathclyde (Australia)
Keith Worden, Univ. of Sheffield (United Kingdom)
Brian Culshaw, Univ. of Strathclyde (United Kingdom)
Alistair McNab, Univ. of Strathclyde (United Kingdom)
Geoffrey R. Tomlinson, Univ. of Sheffield (United Kingdom)
Gordon Hayward, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 3041:
Smart Structures and Materials 1997: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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