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Title: Bioinspired low-frequency material characterisation
Authors: Hopper, C.
Assous, S.
Lovell, M. A.
Wilkinson, P. B.
Gunn, D. A.
Jackson, P. D.
Rees, J. G.
O'Leary, R. L.
First Published: 2012
Publisher: Hindawi Publishing Corporation
Citation: Advances in Acoustics and Vibration, 2012 (2012), 927903
Abstract: New-coded signals, transmitted by high-sensitivity broadband transducers in the 40–200 kHz range, allow subwavelength material discrimination and thickness determination of polypropylene, polyvinylchloride, and brass samples. Frequency domain spectra enable simultaneous measurement of material properties including longitudinal sound velocity and the attenuation constant as well as thickness measurements. Laboratory test measurements agree well with model results, with sound velocity prediction errors of less than 1%, and thickness discrimination of at least wavelength/15. The resolution of these measurements has only been matched in the past through methods that utilise higher frequencies. The ability to obtain the same resolution using low frequencies has many advantages, particularly when dealing with highly attenuating materials. This approach differs significantly from past biomimetic approaches where actual or simulated animal signals have been used and consequently has the potential for application in a range of fields where both improved penetration and high resolution are required, such as nondestructive testing and evaluation, geophysics, and medical physics.
DOI Link: 10.1155/2012/927903
ISSN: 1687-6261
eISSN: 1687-627X
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2012 C. Hopper et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Appears in Collections:Published Articles, Dept. of Geology

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