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Acoustic iridescence.

Trevor J Cox1

  • 1Acoustics Research Centre, University of Salford, Newton Building, Salford, Greater Manchester M5 4WT, United Kingdom. t.j.cox@salford.ac.uk

The Journal of the Acoustical Society of America
|March 25, 2011
PubMed
Summary
This summary is machine-generated.

Researchers created a device mimicking natural optical iridescence using perforated sheets to manipulate sound waves. This acoustic iridescence device strongly reflects sound at specific frequencies and angles, similar to how natural structures reflect light.

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Area of Science:

  • Acoustics
  • Wave Phenomena
  • Materials Science

Background:

  • Natural systems exhibit optical iridescence by manipulating light waves.
  • Acoustic iridescence, the manipulation of sound waves similarly, is an area of emerging research.

Purpose of the Study:

  • To investigate acoustic iridescence.
  • To design and analyze a device capable of producing acoustic iridescence.
  • To explore the potential of metamaterials for acoustic iridescence.

Main Methods:

  • Construction of a device with multiple thin perforated sheets spaced at half-wavelength intervals.
  • Utilizing impedance discontinuities to generate backscattered sound waves.
  • Employing the boundary element method for metamaterial analysis.

Main Results:

  • Observed strong sound reflection at specific, evenly spaced harmonic frequencies.
  • Demonstrated that harmonic frequencies increase with the angle of observation.
  • Noted that sound reflection intensity decreases at oblique angles, mirroring optical iridescence.

Conclusions:

  • The perforated sheet construction effectively produces acoustic iridescence.
  • The device mimics natural optical iridescence in its frequency and angular dependence.
  • Metamaterials show promise for creating acoustic iridescence.