Journal ArticleDOI
Piezoelectric Composite Materials for Ultrasonic Transducer Applications. Part II: Evaluation of Ultrasonic Medical Applications
TLDR
In this paper, the electro-acoustic properties of lead zirconate titanate (PZT) rod-polymer composites relevant for ultrasonic transducer applications are reported.Abstract:
Abstmct-The electro-acoustic properties of Lead zirconate titanate (PZT) rod-polymer composites relevant for ultrasonic transducer applications are reported. Acoustic impedance of the composite materials was measured by three different techniques in the frequency range 0.33.5 MHz. Dependence of the acoustic impedance as a function of volume fraction of PZT and frequency was also modeled theoretically. Time-delay spectrometry was employed to calibrate the free-field transmitting and receiving voltage responses of the composite materials. The acoustic impedance of the composite materials was in the range of 3-10 M rayl. The figure of merit in the receiving mode of composite materials was three times that of PZT. The figure of merit for a 20percent PZT composite (2 = 7.3 M rayl) was further enhanced by 50 percent using a single-layer impedance transformer of lucite (2 =3.3 M rayl). These composite materials were molded into curved shapes by simple thermal process to fabricate focused transducers. The axial and lateral beam profiles of focused composite transducers are presented.read more
Citations
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Journal ArticleDOI
Simple model for piezoelectric ceramic/polymer 1-3 composites used in ultrasonic transducer applications
H.L.W. Chan,J. Unsworth +1 more
TL;DR: In this paper, a theoretical model is presented for combining parameters of 1-3 ultrasonic composite materials in order to predict ultrasonic characteristics such as velocity, acoustic impedance, electromechanical coupling factor, and piezoelectric coefficients.
Proceedings ArticleDOI
The role of piezocomposites in ultrasonic transducers
TL;DR: The dice-and-fill technique produces piezocomposites that can be readily formed into complex shapes to facilitate focusing the ultrasonic beam as mentioned in this paper, which provides high-quality clinical images of substantial diagnostic value to physicians.
Journal ArticleDOI
Piezoelectric composites for sensor and actuator applications
TL;DR: Computer-aided design (CAD)-based fabrication methods, which result in composites whose structural complexity surpass that of composites obtained with traditional methods, are described to introduce the reader to novel concepts in processing of piezocomposites.
Journal ArticleDOI
Overview of Fine-Scale Piezoelectric Ceramic/Polymer Composite Processing
Victor F. Janas,Ahmad Safari +1 more
TL;DR: In this paper, a review of fine-scale piezoelectric ceramic/polymer composites with different connectivities has been presented, and the current capabilities, strengths, and weaknesses of each method are compared.
Journal ArticleDOI
Single crystal PZN/PT-polymer composites for ultrasound transducer applications
TL;DR: Single crystal relaxor ferroelectrics of PZN-8%PT were investigated for potential application in ultrasound transducers and pulse-echo responses displayed good agreement with modeled results using the Redwood equivalent circuit.
References
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Journal Article
Piezoelectric and piezomagnetic materials and their function in transducers
Journal ArticleDOI
Measurement of Elastic Constants at Low Temperatures by Means of Ultrasonic Waves–Data for Silicon and Germanium Single Crystals, and for Fused Silica
TL;DR: In this article, the authors measured velocities of propagation and elastic constants in the 10-30 cm range of a fused silica rod, through polystyrene or silicone one-quarter wavelength seal, and into the solid specimen.
Journal ArticleDOI
Theory of Focusing Radiators
TL;DR: In this article, the authors derived an approximate theory of the sound field due to a concave spherical radiator, vibrating with uniform normal velocity, and showed that the ratio of the intensity at the center of curvature to the average intensity at radiating surface is nearly equal to (2πh/λ)2 where h is the depth of the concave surface and λ is the wave length.
Journal ArticleDOI
Piezoelectric Composite Materials for Ultrasonic Transducer Applications. Part I: Resonant Modes of Vibration of PZT Rod-Polymer Composites
TL;DR: In this paper, the PZT rod-polymer composites have been used for low-frequency hydrophone applications and the effect of temperature on the electromechanical properties of the composite has also been investigated.