Design and Numerical Evaluation of Off-Axis Aplanatic Straubel Mirror for Underwater Acoustic Imaging
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概要
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An aplanatic Straubel mirror was designed for underwater acoustic imaging. However, there was a problem in that incident sound waves coming into the aplanatic Straubel mirror were interrupted by a receiver array placed in front of the mirror. An off-axis Straubel mirror is proposed to solve this problem. In this study, an off-axis aplanatic Straubel mirror is designed and evaluated using numerical calculation to verify the feasibility of the off-axis design. Upon comparison of the off-axis and ordinary aplanatic Straubel mirrors, the off-axis mirror shows almost the same convergence property as the ordinary one when a receiver array exists. The off-axis aplanatic Straubel mirror is compared with an aplanatic Fresnel lens because this lens is not affected by the receiver. The results show that the off-axis mirror showed a smaller aberration than the aplanatic Fresnel lens at a wider angle of view.
- 2012-07-25
著者
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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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Mizutani Koichi
Faculty of Engineering, Information and Systems, University of Tsukuba
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Wakatsuki Naoto
Faculty of Engineering, Information and Systems, University of Tsukuba
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Sato Yuji
Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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