Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)

The Acoustical Society of Korea (한국음향학회)
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Nonlinear Scattering of Difference Frequency Acoustic Wave in Water-Saturated Sandy Sediment

수중 모래퇴적물에서 차주파수 음파의 비선형 산란

  • Kim Byoung-Nam (Acoustic Research Laboratory and BK21 Physics Research Division, Department of Physics, SungKyunKwan University) ;
  • Lee Kang Il (Acoustic Research Laboratory and BK21 Physics Research Division, Department of Physics, SungKyunKwan University) ;
  • Yoon Suk Wang (Acoustic Research Laboratory and BK21 Physics Research Division, Department of Physics, SungKyunKwan University) ;
  • Choi Bok Kyoung (Global Environment Research Laboratory, Korea Ocean Research and Development Institute)
  • 김병남 (성균관대학교 물리학과 음향학연구실, BK21 물리연구단) ;
  • 이강일 (성균관대학교 물리학과 음향학연구실, BK21 물리연구단) ;
  • 윤석왕 (성균관대학교 물리학과 음향학연구실, BK21 물리연구단) ;
  • 최복경 (한국해양연구원 지구환경연구본부)
  • Published : 2004.05.01
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Abstract

Nonlinear scattering of difference frequency acoustic wave in a water-saturated sandy sediment was investigated. Difference frequency acoustic wave was observed to be scattered due to the nonlinearity of water-saturated sandy sediment when the collinear acoustic waves with two different fundamental frequencies are incident on the sediment. The pressure level of the difference frequency acoustic wave was 6 dB higher than the background noise level. It seems very useful to evaluate the nonlinear parameter of water-saturated sandy sediment without disturbing the sediment. Such nonlinear acoustic response of water-saturated sandy sediment can be used as background acoustic data for estimating the gas void fraction in marine gassy sandy sedimen.

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