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Nonlinear Sound Amplification and Directivity Due to Underwater Bubbles  

김병남 (성균관대학교 물리학과 음향학연구실.BK21 물리연구단)
최복경 (한국해양연구원 지구환경 연구본부)
윤석왕 (성균관대학교 물리학과 음향학연구실.BK21 물리연구단)
Publication Information
The Journal of the Acoustical Society of Korea / v.22, no.4, 2003 , pp. 250-260 More about this Journal
Abstract
Since a bubble in water is a highly nonlinear acoustic scatterer, the acoustic scattered waves from underwater bubbles show highly nonlinear acoustic properties. These acoustic scattered waves can be observed at the second or higher harmonics as well as at the fundamental primary frequency of incident acoustic wave. When two primary acoustic waves of different frequencies are incident on a bubble, the acoustic scattered waves can be also observed at the sum and the difference frequencies of the primary waves. In this study, when the two primary acoustic waves were incident on a bubble screen in water, we observed that the amplitude of difference frequency wave was amplified by the bubble nonlinearity and its directivity was oriented in the propagation directions of primary waves. The directivity of scattered difference frequency wave was analyzed as a coherent scattering for virtual source by using the directivity of the primary acoustic wave.
Keywords
Nonlinear; Bubble; Interaction; Difference frequency; Scattering;
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