927903.pdf (2.75 MB)
Download file

Bioinspired low-frequency material characterisation

Download (2.75 MB)
journal contribution
posted on 24.10.2012, 08:55 by C. Hopper, S. Assous, M. A. Lovell, P. B. Wilkinson, D. A. Gunn, P. D. Jackson, J. G. Rees, R. L. O'Leary
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.

History

Citation

Advances in Acoustics and Vibration, 2012 (2012), 927903

Version

VoR (Version of Record)

Published in

Advances in Acoustics and Vibration

Publisher

Hindawi Publishing Corporation

issn

1687-6261

eissn

1687-627X

Copyright date

2012

Available date

24/10/2012

Publisher version

http://www.hindawi.com/journals/aav/2012/927903/

Language

en

Usage metrics

Categories

Keywords

Exports