Miyo Suzuki
Toray Industries
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Publication
Featured researches published by Miyo Suzuki.
Ferroelectrics | 1984
Hiroji Ohigashi; K. Koga; Miyo Suzuki; Toshiharu Nakanishi; K. Kimura; N. Hashimoto
Abstract The copolymers of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) have been found to be effective ultrasonic transducer materials because of their large electromechanical coupling factor kt . On the basis of the results obtained by SEM, X-ray diffraction, and ferroelectric polarization reversal studies of copolymer films, the large kt is ascribed to their high remanent polarization, which may originate from high crystallinity and preferential orientation of well-grown crystallites. Various single element transducers for medical ultrasound imaging have been developed utilizing PVDF and P(VDF-TrFE) films. The performance of these transducers is in good agreement with a theoretical prediction in which their dielectric and mechanical losses are taken into account. The P(VDF-TrFE) transducers have a two-pathway sensitivity 10 dB higher than that of PVDF transducers. They give high resolution medical images much superior in quality to those obtained with conventional ceramic transducers. Linear ...
Japanese Journal of Applied Physics | 1988
Hiroji Ohigashi; Toru Itoh; K. Kimura; Toshiharu Nakanishi; Miyo Suzuki
Piezoelectric polymers have large dielectric and mechanical internal losses. In this study, we introduced internal losses into Masons equivalent circuit, and analyzed the effects of these losses on the transducer response, mainly in the frequency domain. To prove the validity of the theoretical analysis, we fabricated polymer transducers of several backing load types which are effective for practical use, using vinylidene fluoride and trifluoroethylene copolymer films, and evaluated their frequency and impulse responses. The experimental results are in good agreement with the theoretical prediction. We conclude that a consideration of the internal losses is essential for the proper design and correct evaluation of polymer transducers.
Journal of the Acoustical Society of America | 1984
Hiroji Ohigashi; Toshiharu Nakanishi; Miyo Suzuki
Archive | 1980
Toshiharu Nakanishi; Miyo Suzuki; Hiroji Ohigashi
Archive | 1980
Hiroji Ohigashi; Joshiharu Nakanishi; Miyo Suzuki
Archive | 1980
Hiroji Ohigashi; Toshiharu Nakanishi; Miyo Suzuki
Archive | 1980
Toshiharu Nakanishi; Miyo Suzuki; Hiroji Ohigashi
Archive | 1980
Koji Daito; Toshiharu Nakanishi; Miyo Suzuki
Archive | 1979
Koji Daito; Toshiharu Nakanishi; Miyo Suzuki
Archive | 1979
Koji Daito; Toshiharu Nakanishi; Miyo Suzuki