Skip to the content

Acoustic iridescence

Cox, TJ 2011, 'Acoustic iridescence' , The Journal of the Acoustical Society of America (JASA), 129 (3) , pp. 1165-1172.

[img]
Preview
PDF - Published Version
Download (2369kB) | Preview

    Abstract

    An investigation has been undertaken into acoustic iridescence, exploring how a device can be constructed which alter sound waves, in a similar way to structures in nature that act on light to produce optical iridescence. The main construction had many thin perforated sheets spaced half a wavelength apart for a specified design frequency. The sheets create the necessary impedance discontinuities to create backscattered waves, which then interfere to create strongly reflected sound at certain frequencies. Predictions and measurements show a set of harmonics, evenly spaced in frequency, for which sound is reflected strongly. And the frequency of these harmonics increases as the angle of observation gets larger, mimicking the iridescence seen in natural optical systems. Similar to optical systems, the reflections become weaker for oblique angles of reflection. A second construction was briefly examined which exploited a metamaterial made from elements and inclusions which were much smaller than the wavelength. Boundary element method predictions confirmed the potential for creating acous- tic iridescence from layers of such a material.(C) 2011 Acoustical Society of America.

    Item Type: Article
    Themes: Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Acoustics Research Centre
    Journal or Publication Title: The Journal of the Acoustical Society of America (JASA)
    Publisher: Acoustical Society of America
    Refereed: Yes
    ISSN: 0001-4966
    Related URLs:
    Depositing User: TJ Cox
    Date Deposited: 07 Apr 2011 09:49
    Last Modified: 03 Jul 2014 10:45
    URI: http://usir.salford.ac.uk/id/eprint/12997

    Document Downloads

    More statistics for this item...

    Actions (login required)

    Edit record (repository staff only)