Journal ArticleDOI
Performance of a Linear Array Transducer of Vinylidene Fluoride Trifluoroethylene Copolymer
TLDR
In this paper, a 5-MHz 64-element linear array transducer composed of vinylidene fluoride and trifluoroethylene copolymer (P(VDF-TrFE)) has been developed and its performance studied.Abstract:
A 5-MHz 64-element linear array transducer composed of vinylidene fluoride and trifluoroethylene copolymer (P(VDF-TrFE)) has been developed and its performance studied. The transducer has high resolution in both lateral and depth directions and has energy conver- sion efficiency high enough to be used for practical applicalions. The electroacoustic conversion loss (CL) is 6 dB at 5 MHz, and the pulse- echo ring-down period at -20 dB is 1.0 PS. These experimental values are in good agreement with theoretical ones calculated with Mason's equivalent circuit in which the internal losses of a piezoelectric material are taken into account. The ultrasonic field distribution from the array is also in good agreement with the simulations obtained using a numer- ical Huygens' wavelet approach for pulse waves. The maximum cross coupling voltage between the nearest neighbor elements is len percent of the driving voltage. This degree of cross coupling does not appreci- ably degrade the ultrasonic field distribution. A medical echogram taken with this transducer is shown. Its lateral and depth resolutions nn the focal plane are 1.5 mm and 0.75 mm, respectively.read more
Citations
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Journal ArticleDOI
Ultrasound transducer models for piezoelectric polymer films
L.F. Brown,D.L. Carlson +1 more
TL;DR: Comparisons between the models and actual film transducers show excellent broadband simulation of both electrical input impedance and ultrasonic pulse-echo performance.
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A dual frequency ultrasonic probe for medical applications
Shiroh Saitoh,M. Izumi,Y. Mine +2 more
TL;DR: In this article, a dual frequency probe using a multilayer ceramic is proposed for simultaneously obtaining a high resolution B mode and a high sensitivity Doppler mode image, which consists of two layers in which the poling directions are opposite and the individual thicknesses are different.
Proceedings ArticleDOI
Ferroelectric polymers: current and future ultrasound applications
TL;DR: Ferroelectric polymers have been used for both nondestructive testing (NDT) and medical ultrasound as mentioned in this paper, and their future need in such applications as embedded sensors for structural NDT and health monitoring, extremely high-frequency broadband materials characterization, and 'disposable' invasive medical imaging.
Journal ArticleDOI
Generation of very high‐frequency ultrasonic waves using thin films of vinylidene fluoride‐trifluoroethylene copolymer
Kuniko Kimura,Hiroji Ohigashi +1 more
TL;DR: In this article, the properties of thin films of vinylidene fluoride-trifluoroethylene copolymer [P(VDF•TrFE)] and their application to ultrasonic transducers were studied in the frequency range of 50-250 MHz at room temperature.
References
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Journal ArticleDOI
Electromechanical properties of polarized polyvinylidene fluoride films as studied by the piezoelectric resonance method
TL;DR: In this paper, the piezoelectric resonance was observed in free vibrators of uniaxially oriented polyvinylidene fluoride films polarized at high electric fields.
Journal ArticleDOI
Ferroelectric Behavior in the Copolymer of Vinylidenefluoride and Trifluoroethylene
TL;DR: In this paper, the linear and nonlinear dielectrical and depolarization processes of the copolymer of vinylidene fluoride and trifluoroethylene have been measured.
Journal ArticleDOI
Piezoelectricity of vinylidene fluoride-trifluoroethylene copolymers
TL;DR: In this paper, the authors measured the piezoelectric properties of copolymers of vinylidene fluoride (VDF) and trifluoro-ethylene (TrFE) with a wide range of monomer compositions.
Journal ArticleDOI
Ferroelectric Copolymers of Vinylidenefluoride and Trifluoroethylene with a Large Electromechanical Coupling Factor
Hiroji Ohigashi,Keiko Koga +1 more
TL;DR: A large electromechanical coupling factor kt of about 0.3 has been found in vinylidenefluoride and trifluoroethylene copolymers containing 70-80 mol% VDF.
Journal ArticleDOI
Piezoelectric and ferroelectric properties of P (VDF-TrFE) copolymers and their application to ultrasonic transducers
TL;DR: 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.
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