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Acousto-ultrasonic sensing using fibre Bragg gratings

Betz, D. and Thursby, G.J. and Culshaw, B. and Staszewski, W. (2003) Acousto-ultrasonic sensing using fibre Bragg gratings. Smart Materials and Structures, 12 (1). pp. 122-128. ISSN 0964-1726

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Abstract

This paper describes a fiber-optic system which is able to detect ultrasound in structures. The aim of the sensing system is to monitor structures, in particular aircraft structures, by detecting ultrasonic Lamb waves. This type of monitoring technique has recently become a key topic in structural health monitoring. Most common approaches use piezoceramic devices to launch and receive the ultrasound. A new way of fiber-optic detection of Lamb waves is based on fiber Bragg grating sensors. In addition to the well known advantages of fiber-optic sensors, this new interrogation scheme allows the use of Bragg gratings for both high-resolution strain and high-speed ultrasound detection. The focus of the paper is on the ultrasonic part of the system. The theoretical approach and the implementation into a laboratory set-up are elaborated. Experiments have been carried out to calibrate the system and first results on simple structures show the feasibility of the system for sensing ultrasonic Lamb waves.

Item type: Article
ID code: 3549
Keywords: sensors, ultrasonic sensing, Bragg gratings, optoelectronics, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 14 Jun 2007
    Last modified: 16 Jul 2013 18:07
    URI: http://strathprints.strath.ac.uk/id/eprint/3549

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