Numerical Analysis of Ultrasonic Beam of Variable-Line-Focus-Beam Film Transducer
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概要
- 論文の詳細を見る
In this study, the characteristics of an ultrasonic beam radiated by a variable-line-focus-beam transducer were numerically calculated by finite-difference time domain (FDTD) method and liquid-elastic wave reflection theory. The interference ripple caused by a leaky surface acoustic wave (SAW) was observed in the lens width vs received intensity curve. Reasonable results, the true-circle-arc-lens in the literature, were obtained. As in the conventional $\mathrm{V}(\mathrm{z})$ curve, the ripple changed according to the attenuation parameter $\alpha$ and the leaky SAW velocity. Unlike for the conventional true-circle-arc-lens, the ripples caused by the leaky SAWs are observed at both sides of the focal point.
- 2007-07-30
著者
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AOYAGI Takahiro
Center for Research and Development of Educational Technology, Tokyo Institute of Technology
-
Ueha Sadayuki
Precision And Intelligence Lab. Tokyo Inst. Of Technol.
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Nakamura Kentaro
Precision And Intelligence Lab. Tokyo Inst. Of Technol.
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Ueha Sadayuki
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Nakazawa Marie
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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