Abstract
A parametric acoustic source is comprised of a high-amplitude radiated sound field of two frequencies. Because of fluid nonlinearities, this primary field generates a secondary sound field at the difference frequency. Using a simplified mode[ for the primary sound field of a piston transducer, the secondary source levels and directivities generated by such a parametric source have been predicted. The extent of the primary field is assumed to be limited by linear and nonlinear absorption, and this limit is considered to occur in either the collimated-beam or the spherically spreading portions of the primary field. Numerical values have been computed for a variety of conditions and compare favorably with the experimental data obtained to date.
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