Sound Pressure Fields Focused Using Biconcave Acoustic Lens for Normal Incidence
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概要
- 論文の詳細を見る
The underwater imaging sonar system with an acoustic lens is again receiving considerable attention because it does not require a complex beam-forming circuit. The lens system used in this type of sonar was designed by the ray theory or by a hybrid method of the ray and wave theories. In this report, a basic analysis was performed by an analytical method using a wave theory and by a numerical method using the parabolic equation (PE) method, to determine the convergent characteristics of a biconcave lens. The pressure field focused by the biconcave lens was measured in a water tank. The biconcave lens used in the experiment is made of acrylic resin with a radius of 20 cm and a radius of curvature of 20 cm. Measurements was conducted in a water tank at a frequency of 500 kHz. Sound pressure fields around the focal region measured by the experiments agreed well with the calculated ones by the analytical and PE methods.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-05-15
著者
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Anada Tetsuo
Department Of Electrical Electronics And Information Engineering Faculty Of Engineering Kanagawa Uni
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Kamakura Tomoo
Department Of Electrical Engineering University Of Electro-communications
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Nakamura Toshiaki
Department Of Anesthesia Nagasaki Rosai Hospital
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Sato Yuji
Department Of Bacteriology National Institute Of Health
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Anada Tetsuo
Department of Electrical Engineering, Kanagawa University, 3-27 Rokkakubashi, Yokohama 221-8686, Japan
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Kamakura Tomoo
Department of Electronic Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu 182-8585, Japan
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Sato Yuji
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
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