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- W2003982699 abstract "In this paper, we describe the characteristics of an acoustic aplanat lens which can eliminate both spherical and coma aberrations. A singlet aplanat lens was designed using a ray theory in paraxial area. Sound pressure fields of the bi-concave aplanat lens and a spherical lens with 160 mm in diameter for the frequency of 500 kHz were evaluated by a three-dimensional finite difference time domain (3-D FDTD) method. The aplanetic lens showed better convergence characteristics than spherical lens. Two bi-concave lenses of aplanat and spherical lenses were made by acrylic resin and water tank experiment was conducted to compare the on-axis characteristics and beam patterns at the focus of them. As a result, the aplanat lens could focus higher sound pressure than the spherical one within the incident angle of 10 degrees." @default.
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- W2003982699 date "2008-05-01" @default.
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- W2003982699 title "Characteristics of sound pressure field focused by an acoustic aplanat lens" @default.
- W2003982699 doi "https://doi.org/10.1121/1.2935317" @default.
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