Extraordinary acoustic transmission mediated by Helmholtz resonators

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ID: 39469
2014
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Abstract
We demonstrate perfect transmission of sound through a rigid barrier embedded with Helmholtz resonators. The resonators are confined within a waveguide and they are oriented such that one neck protrudes onto each side of the barrier. Perfect sound transmission occurs even though the open area of the necks is less than 3% of the barrier area. Maximum transmission occurs at the resonant frequency of the Helmholtz resonator. Because the dimensions of the Helmholtz resonators are much smaller than the resonant wavelength, the transmission is independent of the direction of sound on the barrier and of the relative placement of the necks. Further, we show that the transmitted sound experiences a continuous phase transition of π radians as a function of frequency through resonance. In simulations of adjacent resonators with slightly offset resonance frequencies, the phase difference leads to destructive interference. By expanding the simulation to a linear array of tuned Helmholtz resonators we show that it is possible to create an acoustic lens. The ability of Helmholtz resonator arrays to manipulate the phase of a plane acoustic wave enables a new class of sonic beam-forming devices analogous to diffractive optics.
Reference Key
koju2014extraordinaryaip Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Koju, Vijay;Rowe, Ebony;Robertson, William M.;
Journal aip advances
Year 2014
DOI
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URL
http://dx.doi.org/10.1063/1.4891849
Keywords Keywords not found

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