Finite Difference Time Domain Analysis of Underwater Acoustic Lens System for Ambient Noise Imaging
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概要
- 論文の詳細を見る
Much attention has been paid to the new idea of detecting objects using ocean ambient noise. This concept is called ambient noise imaging (ANI). In this study, sound fields focused by an acoustic lens system constructed with a single biconcave lens were analyzed using the finite difference time domain (FDTD) method for realizing an ANI system. The size of the lens aperture that would have sufficient resolution—for example, the beam width is 1° at 60 kHz—was roughly determined by comparing the image points and $-3$ dB areas of sound pressure fields generated by lenses with various apertures. Then, in another FDTD analysis, we successfully used a lens with a determined aperture to detect rigid target objects in an acoustic noise field generated by a large number of point sources.
- 2006-05-30
著者
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Mori Kazuyoshi
Department Of Earth And Ocean Sciences National Defense Academy
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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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Ogasawara Hanako
Department of Earth and Ocean Sciences, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
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Miyazaki Ayano
Graduate School of Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan
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