Design for Underwater Aplanatic Straubel Acoustic Mirror
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概要
- 論文の詳細を見る
An aplanatic Fresnel lens was developed in a previous study to reduce the thickness of underwater acoustic lenses. Showing better convergence properties than aplanatic biconvex and hyperbolic Fresnel lenses, the aplanatic Fresnel lens had limitations in terms of frequency and number of waves owing to its shape. An underwater aplanatic Straubel acoustic mirror, the concept o which is based on a Straubel mirror, was designed to remove the two limitations of aplanatic Fresnel lenses. When the lens is used for underwater imaging sonar, the range resolution deteriorates because of these problems. The shape of the aplanatic Straubel mirror was designed using a numerical optimization method, and its convergence properties were evaluated in simulations. The mirror could correct spherical and coma aberrations in accordance with ray theory. In a comparison of the aplanatic Straubel mirror with an aplanatic Fresnel lens, the mirror had less coma aberration and field curvature than the lens. Additionally, the aplanatic Straubel mirror did not have the two limitations of the lens. Therefore, the aplanatic Straubel mirror showed better convergence than the aplanatic Fresnel lens.
- 2011-07-25
著者
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Mizutani Koichi
Graduate School Of Systems And Information Engineering Univ. Of Tsukuba
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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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Wakatsuki Naoto
Graduate School Of Systems And Information Engineering University Of Tsukuba
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Mizutani Koichi
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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