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Bioinspired low-frequency material characterisation

Hopper, Clare and Assous, Said and Wilkinson, Paul and Gunn, David and Jackson, Peter and Rees, John and O'Leary, Richard and Lovell, Mike (2012) Bioinspired low-frequency material characterisation. Advances in Acoustics and Vibration, 2012. ISSN 1687-6261

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    Abstract

    New carefully created signals, transmitted by high sensitivity broadband transducers in the 40-200 kHz range, allow material discrimination and thickness determination of polypropylene, polyvinylchloride and brass samples to sub-wavelength resolution. Analysis of frequency domain spectra, acquired experimentally using a water coupled through transmission experiment, enable material and thickness measurements that agree well with modelled data, with sound velocity prediction errors of less than 1 %, and thickness discrimination of at least wavelength/15. The accuracies found using our technique were similar to those obtained with higher frequencies; therefore, the lower frequency experiment demonstrates comparable performance to datasets obtained using devices possessing higher frequencies. This is advantageous when dealing with highly attenuating materials. The proposed signals and experimental approach will have an impact in the fields of non-destructive evaluation and imaging related to geophysics, and medical physics, where improving penetration whilst maintaining resolution is highly desired.

    Item type: Article
    ID code: 38284
    Keywords: material characterisation, ultrasound, thickness measurement, bio-inspired, signal procesiing, Electrical engineering. Electronics Nuclear engineering, Acoustics and Ultrasonics, Mechanics of Materials, Building and Construction
    Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
    Department: Faculty of Engineering > Electronic and Electrical Engineering
    Technology and Innovation Centre > Sensors and Asset Management
    Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 07 Mar 2012 15:57
    Last modified: 06 Sep 2014 01:11
    URI: http://strathprints.strath.ac.uk/id/eprint/38284

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