Published in
Acoustical Society of America, The Journal of the Acoustical Society of America, 3(127), p. 2014
DOI: 10.1121/1.3385240
American Institute of Physics, Applied Physics Letters, 20(95), p. 204102
DOI: 10.1063/1.3263949
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Sound control by temperature gradients
,
Mitko I. Angelov,
Francisco Cervera,
Liang-Wu Cai
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Abstract
This work reports experiments showing that airborne sound propagation can be controlled by temperature gradients. A system of two heated tubes is here used to demonstrate the collimation and focusing of an ultrasonic beam by the refractive index profile created by the temperature gradients existing around the tubes. Numerical simulations supporting the experimental findings are also reported.