Design of an Absolutely Aplanatic Acoustic Lens
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概要
- 論文の詳細を見る
The underwater sonar system using an acoustic lens is receiving attention again because it does not need a complex electrical circuit and exhibits reduced volume and cost. However, in our former experiments, singlet spherical or aspherical lenses could not concentrate sound at a focal point completely because of aberrations. In this study, we tried to design a lens that can remove spherical and coma aberrations in a paraxial area using a ray tracing method, and two types of lens were designed. One is a biconcave acoustic lens with the refractive index of $n=0.56$, which corresponds to an acrylic resin, and the other is a biconvex acoustic lens with $n=1.5$, which corresponds to a silicon rubber. These lenses are evaluated by comparing of their sound pressure fields with those of a spherical lens and a plano-concave elliptic lens as calculated by a two-dimensional finite difference time domain (2D-FDTD) method. As a result, the biconcave aplanatic lens shows the best performance among these four lenses.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-07-30
著者
-
Mori Kazuyoshi
Department Of Earth And Ocean Sciences National Defense Academy
-
Nakamura Toshiaki
Department Of Anesthesia Nagasaki Rosai Hospital
-
Sato Yuji
Department Of Bacteriology National Institute Of Health
-
Nakamura Toshiaki
Department of Earth and Ocean Sciences, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
-
Miyazaki Ayano
Department of Earth and Ocean Sciences, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
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