Abstract
To analyze the characteristics of the acoustical imaging utilizing higher harmonic components in the focused sound field, the influence of a diffracting edge put into the focal region on the fundamental and second harmonic fields is theoretically and experimentally investigated. A straight rigid edge put normal to the acoustic axis is assumed to diffract a focused Gaussian beam. The second harmonic sound generated both in front of and beyond the edge is taken into account to calculate the diffracted field through the manner using the Green’s function for the governing approximate equation. In the experiment, a knife edge is inserted normal to the sound beam formed by the 1.9-MHz focusing Gaussian source employing a concave piezoelectric transducer with an asteroid electrode. The axial field detected by a needle-type hydrophone as well as the signal obtained with another concave transducer is discussed regarding the amplitudes and phase difference of the fundamental and second harmonic components.
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