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Remote Sens. 2009, 1(2), 68-79; doi:10.3390/rs1020068

Use of Macro Fibre Composite Transducers as Acoustic Emission Sensors

* ,
Cardiff School of Engineering, Queen’s Buildings, The Parade, Newport Road, Cardiff, CF24 3AA, U.K.
* Author to whom correspondence should be addressed.
Received: 13 March 2009 / Revised: 22 April 2009 / Accepted: 23 April 2009 / Published: 24 April 2009
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The need for ever lighter and more efficient aerospace structures and components has led to continuous optimization pushing the limits of structural performance. In order to ensure continued safe operation during long term service it is desirable to develop a structural health monitoring (SHM) system. Acoustic emission (AE) offers great potential for real time global monitoring of aerospace structures, however currently available commercial sensors have limitations in size, weight and adaptability to complex structures. This work investigates the potential use of macro-fibre composite (MFC) film transducers as AE sensors. Due to the inhomogeneous make-up of MFC transducers their directional dependency was examined and found to have limited effect on signal feature data. However, signal cross-correlations revealed a strong directional dependency. The sensitivity and signal attenuation with distance of MFC sensors were compared with those of commercially available sensors. Although noticeably less sensitive than the commercial sensors, the MFC sensors still had an acceptable operating range. Furthermore, a series of compressive carbon fiber coupon tests were monitored in parallel using both an MFC sensor and a commercially available sensor for comparison. The results showed good agreement of AE trends recorded by both sensors.
Keywords: Acoustic emission; sensors; macro-fibre composite Acoustic emission; sensors; macro-fibre composite
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Eaton, M.; Pullin, R.; Holford, K.; Evans, S.; Featherston, C.; Rose, A. Use of Macro Fibre Composite Transducers as Acoustic Emission Sensors. Remote Sens. 2009, 1, 68-79.

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