Influence of dimensions on the sensitivity characteristics of thickness extensional mode piezoelectric ultrasonic transducers

If the thickness‐to‐width ratio of the thickness extensional mode piezoelectric ultrasonic transducer is not too large, the mode coupling will produce a complicated resonance system, and this will complicate the sensitivity characteristics, which is a basic characteristic of the ultrasonic transduce...

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Bibliographic Details
Published inElectronics & communications in Japan. Part 3, Fundamental electronic science Vol. 75; no. 11; pp. 67 - 76
Main Authors Kamata, Hiroshi, Chubachi, Noriyoshi
Format Journal Article
LanguageEnglish
Published New York Wiley Subscription Services, Inc., A Wiley Company 1992
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Summary:If the thickness‐to‐width ratio of the thickness extensional mode piezoelectric ultrasonic transducer is not too large, the mode coupling will produce a complicated resonance system, and this will complicate the sensitivity characteristics, which is a basic characteristic of the ultrasonic transducer. If the dimensional ratio is adapted in such a way that the lateral mode can be suppressed, so the single mode of the thickness extension can be simplified, then the sensitivity characteristics of the ultrasonic transducer can be simplified. On the basis of lumped parameter equivalent circuit of the three‐dimensional coupled piezoelectric transducer, the three‐dimensional coupling sensitivity vs. frequency characteristics are derived, and the relationship between dimensional ratio and receiving sensitivity is clearly provided. From the frequency condition of the maximum sensitivity, the antiresonance coupling factor of the parallel longitudinal mode and, thus, the dimensional ratio condition of the mode simplification are derived. Furthermore, the degree of coupling with receiving sensitivity of parallel longitudinal mode is used as a measure to define the sensitivity coupling factor; and, based on the sensitivity coupling factor, the condition to simplify the sensitivity characteristics of ultrasonic transducer is shown.
Bibliography:ArticleID:ECJC4430751107
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received a B.S. and M.S. in Electrical Engineering from Tohoku University, Sendai, Japan, in 1970 and 1972, respectively, and was awarded his Ph.D. at Tohoku University in 1991 for work carried out in the field of sonar transducer. Since 1972 he has been at Oki Electric Industry Co., Ltd., Japan, where he is presently General Manager of Marine Acoustic Department of Electronic Systems Laboratory. His main research interests are on the application of underwater acoustic transducers, particularly in the field of sonar system. Dr. Kamata is a member of I.E.I.C.E., of Japan, the Acoustic Society of Japan, and the Marine Acoustics Society of Japan.
Noriyoshi Chubachi
Hiroshi Kamata
received a B.S., M.S., and Ph.D. in Electrical Engineering from Tohoku University, Sendai, Japan, in 1956, 1962, and 1965, respectively. In 1965 he joined the Research Institute of Electrical Engineering, Tohoku University, where he was an Associate Professor from 1966 to 1978. Since 1979 he has been a Professor at the Department of Electrical Engineering, Tohoku University. He has worked on ultrasonic transducers and delay lines, surface‐acoustic devices, acoustoelectronics, piezoelectric materials, acoustic microscopy, and related problems. Dr. Chubachi is a member of the Electrical Society of Japan, I.E.I.C.E., of Japan, the Japan Society of Applied Physics, the Acoustical Society of Japan, the Japan Society of Ultrasonics in Medicine, and the Japan Society of Nondestructive Inspection. He served as chairman of Tokyo chapter of IEEE UFFC Society from 1987 to 1988. He received the Inaba Award in 1964 and the UFFC Outstanding Paper Award in 1989.
ISSN:1042-0967
1520-6440
DOI:10.1002/ecjc.4430751107