3-D FDTD Analysis of Sound Field Focused by Biconcave Acoustic Lens for Normal Incidence
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概要
- 論文の詳細を見る
Recently, the finite difference time domain (FDTD) method has been frequently used for the analysis of underwater sound propagation. There are demonstrated advantages of this FDTD method in terms of obtaining data regarding snapshots of sound pressure distribution and a series of waveforms at any point. In addition, the method facilitates the modeling of factors, such as the sound source and media into the analysis domain. In this study, a three-dimensional FDTD analysis was carried out in order to obtain the sound field focused by a biconcave acoustic lens specialized to measure the normal incidence of the spherical wave. Additionally, the results of the analysis were compared with experimental results obtained in a water tank. When the frequency of the sound source was 500 kHz, the range between the acoustic lens and the sound source was 1.78 m, and the attenuation constant was 0.5–1.0 dB/$\lambda$, the experimental results regarding the position of the focal point, the on-axis characteristics and the beam pattern were all found to agree well with the simulation results obtained by FDTD method.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-06-15
著者
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Hasegawa Akio
Department Of Applied Physics National Defense Academy
-
Mori Kazuyoshi
Department Of Earth And Ocean Sciences National Defense Academy
-
Yokoyama Tomoki
Department Of Applied Physics National Defense Academy
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Nakamura Toshiaki
Department Of Anesthesia Nagasaki Rosai Hospital
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Nakamura Toshiaki
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
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Yokoyama Tomoki
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
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Mori Kazuyoshi
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
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