Acoustic wave front conjugation in a three-phase mediaстатья
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Дата последнего поиска статьи во внешних источниках: 11 августа 2015 г.
Аннотация:Acoustic wave reversal is studied in a sandy marine sediment that contains air bubbles
in its fluid fraction. The considered phase conjugation is a four-wave nonlinear parametric
sound interaction process caused by nonlinear bubble oscillations which are known
to be dominant in acoustic nonlinear interactions in three-phase marine sediments.
Two various mechanisms of phase conjugation are studied. One of them is
based on the stimulated Raman-type sound scattering on resonance bubble oscillations.
The second one is associated with sound interactions with bubble oscillations
which frequencies are far from resonance bubble frequencies.
Nonlinear equations to solve the wave-front conjugation problem are derived, expressions for
acoustic wave amplitudes with a reversed wave front are obtained and compared for various frequencies of
the excited bubble oscillations.