三相介质中的声wave front反转
Acoustic wave front reversal in a three-phase media
摘要：
声波阵面共轭的研究在一个沙质海洋沉积物，其中包含气泡在其流体部分。所考虑的相位共轭是一个四波非线性参量声相互作用过程所造成的非线性气泡振荡，这是已知的占主导地位的声学非线性相互作用在三相海洋沉积物。两种不同的相位共轭机制进行了研究。其中之一是基于共振气泡振荡的受激拉曼型声散射。第二个是与声音相互作用的气泡振荡的频率是远离共振气泡频率。导出了求解波前共轭问题的非线性方程组，得到了具有反向波前的声波振幅的表达式，并对不同频率的激励气泡振荡进行了比较。
英文摘要：
Acoustic wave front conjugation 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.
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