Title :
A piezoceramic-piezopolymer composite transducer for improved near field imaging
Author :
Hamilton, R. ; Hayward, G.
Author_Institution :
Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK
Abstract :
The modeling, design, and appraisal of a novel piezoceramic-piezopolymer composite transducer for close range imaging are described. The transmitter utilizes the superior electromechanical coupling coefficient of piezoceramic materials in conjunction with appropriate aperture apodization, for the generation of the spatial characteristics required for enhanced near-field imaging. A separate integral piezopolymer array receiver is employed to provide wideband, sensitive reception and operational versatility. By configuring a polyvinylidene (PVDF) receiver as a one-dimensional multielement annular array the reception characteristics may be tailored to provide dynamic axial focusing. The incorporation of such a reception device, coupled with the axial focused field of an apodized transmitter, offers an attractive transduction option
Keywords :
acoustic arrays; acoustic imaging; acoustic receivers; ceramics; composite materials; focusing; piezoelectric transducers; polymers; ultrasonic applications; ultrasonic diffraction; ultrasonic transducers; PVDF receiver; aperture apodization; apodized transmitter; close range imaging; design; dynamic axial focusing; electromechanical coupling coefficient; integral piezopolymer array receiver; modeling; near field imaging; one-dimensional multielement annular array; piezoceramic-piezopolymer composite transducer; wideband reception; Apertures; Character generation; Diffraction; Electrodes; Focusing; Piezoelectric materials; Transmitters; Ultrasonic imaging; Ultrasonic transducers; Wideband;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234108
