Design and Convergence Performance Analysis of Aspherical Acoustic Lens Applied to Ambient Noise Imaging in Actual Ocean Experiment
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概要
- 論文の詳細を見る
In this study, an aspherical lens with the aperture diameter of 1.0 m was designed for utilization in an actual ocean experiment of ambient noise imaging (ANI). It was expected that this ANI system would realize directional resolution, which is a beam width of 1° at the center frequency of 120 kHz. We analyzed the sound pressure distribution focused by the designed lens using the 3D finite difference time domain method. The frequency dependence of a $-3$ dB area was then compared between 120 kHz and the higher or lower frequency. The analysis results suggested that the designed lens has fine directional resolution over the center frequency of 120 kHz. We had measured the directivity of the designed lens in an actual ocean experiment in Uchiura Bay in November of 2010. It was verified that the ANI system with this lens realizes a beam width of 1° at 120 kHz.
- 2011-07-25
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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Tsuchiya Takenobu
Department of Electronics and Informatics Frontiers, Kanagawa University, Yokohama 221-8624, 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 Electronics and Informatics Frontiers, 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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