Nonlinear Formation of Low-Frequency Field by Diffracting High-Frequency Wave Beams
O. V. Rudenkoa, b, c, *
aMoscow State University, Faculty of Physics, Moscow, Russia
bProkhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
cSchmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow, Russia
email: *rudenko@acs366.phys.msu.ru
Received 25 June, 2024
Abstract— The universal theory of “parametric” sound emitters is presented, taking into account the attenuation and diffraction of interacting waves in the quasi-optical approximation. Expressions are given that describe the structure of the low-frequency field excited by high-frequency waves with arbitrary amplitude and phase distributions on the surface of pump transducers. Universal formulas for calculating directivity patterns are given. The dynamics of pattern formation is described. The results of calculating the regime of highly distorted pump waves containing shock fronts are presented.
Keywords:
nonlinear generation,
low frequencies,
diffracting beams,
directivity pattern
DOI: 10.1134/S1063771025600123