Harmonic ultrasound fields through layered liquid media.

TitleHarmonic ultrasound fields through layered liquid media.
Publication TypeJournal Article
Year of Publication2004
JournalIEEE transactions on ultrasonics, ferroelectrics, and frequency control
Date Published2004 Feb
AbstractHarmonic field generation through a layered liquid media is studied experimentally and theoretically. Lateral and axial beam profiles of the fundamental to the 4th harmonic component of the field from a focused, 19-mm diameter transducer were measured using a calibrated hydrophone in a water tank. Measurements were performed before and after the insertion of a cylindrical phantom containing vegetable oil. A frequency domain numerical solution to the "KZK" equation was used to calculate the beam profile, taking into account the acoustic properties of the medium and phantom. Effects of nonlinear propagation, diffraction, attenuation, and reflection are include in the calculation. Agreement within 5% was obtained between measurements and theoretical predictions throughout the mid- and far-field of the transducer for both the uniform path and the layered media. Measurements also were carried out using an unfocused transducer as a receiver. The shape of the axial beam profile using this receiver agreed very well with the theoretical prediction using the "KZK" equation, after accounting for phase variations over the finite-sized detector in the calculated field.
PubMed Linkhttp://www.ncbi.nlm.nih.gov/pubmed/15055804?dopt=Abstract
Short TitleIEEE Trans Ultrason Ferroelectr Freq Control