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

The Acoustical Society of Korea (한국음향학회)
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Estimation of Nonlinear Parameter in Water - saturated Sandy Sediment by using Difference Frequency Acoustic wave

수중 모래 퇴적물에서 차 주파수 음파를 이용한 비선형 변수 추정

  • Kim Byoung-Nam (Acoustics Research Laboratory and BK21 Physics Research Division, Department of physics, Sungkyunkwan University) ;
  • Lee Kang Il (Acoustics Research Laboratory and BK21 Physics Research Division, Department of physics, Sungkyunkwan University) ;
  • Yoon Suk Wang (Acoustics Research Laboratory and BK21 Physics Research Division, Department of physics, Sungkyunkwan University) ;
  • Choi Bok Kyung (Ocean Climate and Environment Research Division, Korea Ocean Research and Development Institute)
  • 김병남 (성균관대학교 물리학과 음향학 연구실) ;
  • 이강일 (성균관대학교 물리학과 음향학 연구실) ;
  • 윤석왕 (성균관대학교 물리학과 음향학 연구실) ;
  • 최복경 (한국해양연구원 해양기후환경 연구본부)
  • Published : 2004.11.01
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Abstract

Nonlinear acoustic responses of water-saturated sediments are very important to understand nonlinear phenomena of gassy ocean sediments. Especially, the second harmonic, the sum and the difference frequency acoustic waves in water-saturated sediments can provide practical criteria to estimate the nonlinear parameter of gassy sediments. In this paper, the difference frequency acoustic wave in water-saturated sandy sediment was observed in a water tank experiment with a pulse transmission technique. Its pressure level was 12 dB higher than the background noise level at a maximum undistorted driving pressure of source acoustic transducer. The experimental results were compared with a theoretical estimation of the parametric acoustic array. The nonlinear parameter of water-saturated sandy sediment was also estimated as 73 with their comparison. This value can be utilized as the background information to estimate gas void fraction in the water-saturated gassy sandy sediment.

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