Cox, TJ 2011, 'Acoustic iridescence' , The Journal of the Acoustical Society of America (JASA), 129 (3) , pp. 1165-1172.
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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.
|Themes:||Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound
Subjects outside of the University Themes
|Schools:||Schools > School of Computing, Science and Engineering
Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre (SIRC)
|Journal or Publication Title:||The Journal of the Acoustical Society of America (JASA)|
|Publisher:||Acoustical Society of America|
|Depositing User:||TJ Cox|
|Date Deposited:||07 Apr 2011 08:49|
|Last Modified:||30 Nov 2015 23:56|
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