Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2827193
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It is shown that low-frequency elastic vibrations of near-surface planar defects cause high-frequency ultrasonic radiation in surrounding air. The frequency conversion mechanism is concerned with contact nonlinearity of the defect vibrations and provides efficient generation of air-coupled higher-order ultraharmonics, ultrasubharmonics, and combination frequencies. The nonlinear air-coupled ultrasonic emission is applied for location and high-resolution imaging of damage-induced defects in a variety of solid materials.(c) 2007 American Institute of Physics.
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