Jpn. J. Appl. Phys. 24 (1985) Supplement 24-1 pp. 62-64 |Previous Article| |Next Article| |Table of Contents|
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(Received January 18, 1985)
Ultrasound focusing transducers with a toroidal radiating surface can generate a narrow-beam ultrasound over a large depth, while they produce high-level sidelobes. In this paper two types of modified toroidal transducers are proposed with improved sidelobe characteristics; one is a concave-toroidal hybrid transducer and the other is a dual-phase toroidal transducer. These transducers exhibit almost the same beamwidth characteristics as toroidal ones and a reduced fractional sidelobe level of 15–20% in a certain axial range, in contrast with 30–40% for toroidal transducers.
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http://jjap.jsap.jp/link?JJAPS/24S1/62/