Machine Vision

Nie, Yonggang; Ishii, Idaku; Tanaka, Akane; Matsuda, Hiroshi

doi:10.5772/25319

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Comparison With Aplanatic Fresnel Lens1

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2012

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“…It is considered that the resolution of the off-axis mirror at large incident angles can be improved with image sharpening, which is a type of image processing, because the À3 dB areas of the off-axis mirror show almost circular shapes. 34)…”

Section: Comparison With Aplanatic Fresnel Lensmentioning

confidence: 99%

Design and Numerical Evaluation of Off-Axis Aplanatic Straubel Mirror for Underwater Acoustic Imaging

Sato

Mizutani

Wakatsuki

et al. 2012

Jpn. J. Appl. Phys.

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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. #

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Section: Comparison With Aplanatic Fresnel Lensmentioning

confidence: 99%