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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 원문보기

한국음향학회 2004년도 추계학술발표대회논문집 제23권 2호, 2004 Fall, 2004년, pp.429 - 432  

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)

Abstract ▼ AI-Helper 아이콘AI-Helper

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 no...

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대상 데이터

  • We used this driving method to get a condition of continuous waves with high amplitude. The signal sources were two function generators(Agilent 33250A) and the signals were amplified by 50 dB through a power amplified Amplifier Research AR 75A 250) before transmitted through the transducer. The transmitted signal was received by a hydrophone(B&K 8103) and it wasplaced at a distance of 400 mm from the sediment and thedistance was far field distance of the transducer.
  • We used this driving method to get a condition of continuous waves with high amplitude. The signal sources were two function generators(Agilent 33250A) and the signals were amplified by 50 dB through a power amplified Amplifier Research AR 75A 250) before transmitted through the transducer. The transmitted signal was received by a hydrophone(B&K 8103) and it wasplaced at a distance of 400 mm from the sediment and thedistance was far field distance of the transducer.
  • The signal sources were two function generators(Agilent 33250A) and the signals were amplified by 50 dB through a power amplified Amplifier Research AR 75A 250) before transmitted through the transducer. The transmitted signal was received by a hydrophone(B&K 8103) and it wasplaced at a distance of 400 mm from the sediment and thedistance was far field distance of the transducer. A movement of the hydrophone was controlled through the positioning system.
  • The transmitted signal was received by a hydrophone(B&K 8103) and it wasplaced at a distance of 400 mm from the sediment and thedistance was far field distance of the transducer.

이론/모형

  • In this paper, the generation of the difference frequency acoustic wave in water-saturated sandy sediments was observed by using pulse transmission techniques. The experimental results are predicted with the theory of the parametric acoustic array[7].
  • The difference frequency acoustic wave in the watersaturated sandy sediment was significantly observed due to the nonlinearity of the sediment. Its directivity beam pattern is predicted by using the theory of the parametric acoustic array. The nonlinearity parameter is also estimated by using the theory.
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