Characteristics of a Discretely Weighted Conical Transducer for Generation of Limited Diffraction Beams

元データ 1996-05-30 社団法人応用物理学会

概要

We proposed discretely weighted conical transducers as a simple and practical method of generating Bessel-type limited diffraction beams. In this paper we present the design and fabrication of a discretely weighted conical transducer and examine its capability of generating narrow-beam ultrasound. The transducer has eight annular electrodes, to which position-dependent discrete voltages are applied to create approximately the desired velocity distribution of vibration. It is shown experimentally that an almost uniform -6 dB beamwidth of 6-9 wavelengths is obtained in the axial range of z = 10 mm to 200 mm using a transducer 25 mm in diameter operating at 3.6 MHz.

著者

Koike T Toshiba Corp. Yokohama Jpn
Yamada Kazushi Department Of Polymer Science And Engineering Kyoto Institute Of Technology
NAKAMURA Kiyoshi Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku Unive
YAMADA Ken Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku Unive
Nakamura K Department Of Electrical Engineering School Of Engineering Nagoya University
Yamada Keiichi Department Of Electrical Engineering Hiroshima University
Yamada Koichi Advanced Technology R&d Center Mitsubishi Electric Corporation
山田 顕 東北学院大院工
KOIKE Takashi Department of Applied Biochemistry, Faculty of Applied Biological Science, Hiroshima University
Koike T Shizuoka Univ. Shizuoka Jpn
Koike Takashi Department Of Applied Biochemistry Faculty Of Applied Biological Science Hiroshima University
Nakamura Kiyoshi Department Of Electircal Communications Faculty Of Engineering Tohoku University
Nakamura Kiyoshi Department Of Chemistry Faculty Of Science Shinshu University
Yamada Ken Department Of Applied Chemistry Faculty Of Science And Technology Keio University

関連論文

▼もっと見る