Evaluating Directional Resolution of Aplanatic Acoustic Lens for Designing Ambient Noise Imaging System
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概要
- 論文の詳細を見る
In our previous studies, it was verified that a spherical biconcave lens with an aperture diameter of 2.0 m has a sufficient directional resolution (e.g., a beam width of 1° at 60 kHz) for realizing an ambient noise imaging (ANI) system. In this study, an aplanatic lens that corrects both spherical and coma aberrations with the same aperture was designed for an ANI system, and its directional resolution was evaluated. First, in order to predict the resolution, we performed a numerical analysis using the finite difference time domain (FDTD) method. Second, the numerical analysis results were verified by a small-scale trial of one-fifth of full size in a water tank. The shapes of the $-3$ dB areas were similar between the numerical analysis and experimental results at small incidence angles, and the $-3$ dB areas do not overlap at 1° increments of incidence angle. The resolution of the aplanatic lens was closer to that of an ideal lens than to that of the spherical lens. Finally, it was satisfied that the present lens has sufficient directional resolution for use in an ANI system.
- 2009-07-25
著者
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Mori Kazuyoshi
Department Of Earth And Ocean Sciences National Defense Academy
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Nakamura Toshiaki
Department Of Anesthesia Nagasaki Rosai Hospital
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Sato Yuji
Graduate School Of Medicine And Pharmaceutical Sciences University Of Toyama
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Tsuchiya Takenobu
Department of Electronics and Informatics Frontiers, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
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Tsuchiya Takenobu
Department of Electrical and Electronic Information Engineering, Kanagawa University, Yokohama 221-8624, Japan
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Endoh Nobuyuki
Department of Electrical and Electronic Information Engineering, Kanagawa University, Yokohama 221-8624, Japan
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Ogasawara Hanako
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
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Sato Yuji
Graduate School of Systems and Information Engineering, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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