Development of a Long-Focal-Range Annular Array Ultrasonic Transducer

Korai, Yusuke; Baba, Atsushi

doi:10.7567/jjap.51.07gc03

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Our previous studies of unfocused transducer on polyethyleneimine (PEI) substrate showed a resonance frequency at ∼λ/2 which is higher than λ/4 resonance mode [18]. Ferroelectric PVDF and its copolymer PVDF trifluoroethylene P(VDF-TrFE) are widely used to make ultrasonic sensors and transducers [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The application of P(VDF-TrFE) piezoelectric copolymer has been broadened from hydrophone fabrication to ultrasonic imaging and further to photoacoustic imaging of the microstructures of tissue, dermatology, ophthalmology, and biomicroscopy imaging [18,24,[29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of adhesive-free focused high-frequency PVDF copolymer transducers fabricated on spherical cavities

Habib

Wagle

Decharat

et al. 2020

Smart Mater. Struct.

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A layer-by-layer deposition method for fabricating a focused ultrasonic transducer from piezoelectric copolymers has been developed. The fabrication process involves engraving a spherical cavity of 2 mm diameter on polyethyleneimines (PEI) polymer substrate. Surface roughness of the engraved spherical cavity is measured and compared with simulated line scan. Then, the transducer response was investigated by observing the acoustic pulse reflection from the glass plate used as reflector in a focal point. The average central frequency responses were measured to be 48.5 MHz, with a lower and upper −6 dB frequencies of approximately 25 and 76.5 MHz, yielding a bandwidth of 94.2%. A scanning hydrophone system has been employed to determine the focal zone of the transducer and compared with simulation using COMSOL Multiphysics. Two-dimensional surface scanning was performed on the test sample to provide the ultrasonic imaging of the transducer prototype and compare the image with commercial PVDF transducer with a center frequency of (48.5 ± 1) MHz.

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Section: Introductionmentioning

confidence: 99%

Evaluation of adhesive-free focused high-frequency PVDF copolymer transducers fabricated on spherical cavities

Habib

Wagle

Decharat

et al. 2020

Smart Mater. Struct.

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show abstract

“…2) PVDF and its copolymers are found suitable for high frequency array transducers applied to medical imaging for instance, in dermatology, ophthalmology and cardiovascular. 14,15) For these application the wide bandwidth and small wavelengths help improving the lateral and the axial resolution. 16,17) However, one of the major challenges of for high frequency array transducers is to obtain sufficient uniformity between the individual array elements, e.g., measured in in terms of bandwidth and signal strength.…”

mentioning

confidence: 99%

Evaluation of adhesive-free crossed-electrode poly(vinylidene fluoride) copolymer array transducers for high frequency imaging

Wagle¹,

Decharat²,

Habib³

et al. 2016

Jpn. J. Appl. Phys.

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High frequency crossed-electrode transducers have been investigated, both as single and dual layer transducers. Prototypes of these transducers were developed for 4 crossed lines (yielding 16 square elements) on a polymer substrate, using a layer-by-layer deposition method for poly(vinylidene fluoride–trifluoroethylene) [P(VDF–TrFE)] with intermediate sputtered electrodes. The transducer was characterized using various methods [LCR analyzer, a pulse–echo experimental setup, and a numerical Finite element method (FEM) model] and evaluated in terms of uniformity of bandwidth and acoustical energy output. All 16 transducer elements produced broad-banded ultrasonic spectra with small variation in central frequency and −6 dB bandwidth. The frequency responses obtained experimentally were verified using a numerical model.

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Development of a Long-Focal-Range Annular Array Ultrasonic Transducer

Cited by 2 publications

References 7 publications

Evaluation of adhesive-free focused high-frequency PVDF copolymer transducers fabricated on spherical cavities

Evaluation of adhesive-free focused high-frequency PVDF copolymer transducers fabricated on spherical cavities

Evaluation of adhesive-free crossed-electrode poly(vinylidene fluoride) copolymer array transducers for high frequency imaging

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