Simple model for piezoelectric ceramic/polymer 1–3 composites used in ultrasonic transducer applications

Chan, Helen Lai Wa; Unsworth, J.

doi:10.1016/0963-8695(92)90426-h

Cited by 23 publications

(40 citation statements)

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“…The calculated resonance frequency as a function of the width-to-thickness ratio for a PZT-5 rectangular plate agreed with the experimental data obtained [7]. Chan and Unsworth [5] and Chan et al [6] studied the coupled resonance characteristics of square ceramic rods in ceramic/epoxy 1-3 composites. The calculated resonance frequencies agreed well with the observed values for PZT-5H/epoxy, PZT-7A/epoxy 1-3 composites [5] and for modified lead titanate/epoxy 1-3 composite [6].…”

Section: Introductionsupporting

confidence: 84%

“…Chan and Unsworth [5] and Chan et al [6] studied the coupled resonance characteristics of square ceramic rods in ceramic/epoxy 1-3 composites. The calculated resonance frequencies agreed well with the observed values for PZT-5H/epoxy, PZT-7A/epoxy 1-3 composites [5] and for modified lead titanate/epoxy 1-3 composite [6]. In addition, they showed that, for medical imaging applications (operating frequency > 5 MHz), the width-to-length ratio of the ceramic rods should be larger than 1.5 for composites having a 0.075-mm polymer width and a 0.15-mm ceramic width [6].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, they showed that, for medical imaging applications (operating frequency > 5 MHz), the width-to-length ratio of the ceramic rods should be larger than 1.5 for composites having a 0.075-mm polymer width and a 0.15-mm ceramic width [6]. Bui et al [9] followed the work of Chan and Unsworth [5] to fabricate a dual-frequency (2 and 5 MHz) ultrasonic transducer using PZT-7A/epoxy 1-3 composites.…”

Section: Introductionmentioning

confidence: 99%

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Lead zirconate titanate/poly(vinylidene fluoride-trifluoroethylene) 1-3 composites for ultrasonic transducer applications

Kwok

Chan

Choy

1999

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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A new procedure for preparing lead zirconate titanate (PZT)/poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) 1-3 composites with both phases piezoelectrically active is described. Sintered PZT rods are inserted into a prepoled copolymer matrix, and the composite is repoled under a lower electric field. Using this new procedure, the dipoles in the two phases are aligned in either the same or opposite directions. Composite disks, of 12.7-cm diameter and 0.33- to 0.60-mm thicknesses, have been fabricated with PZT rods of 0.8 or 1 mm diameter distributed in a square pattern with 3 mm center-to-center separation. The ceramic volume contents of the composite disks are 3.6 and 5.6%, respectively. The resonance characteristics of the composite disks consist of the resonance modes of the two constituent phases, but they are dominated by the coupled longitudinal thickness mode (H-mode) of the PZT rods. The coupled radial mode (L-mode) resonance of the PZT rods is significant only for thin disks. The observed resonance frequencies of the H- and L-modes agree well with the values calculated from the coupling theory. The thickness mode resonance of the copolymer matrix (T-mode) is present but hardly observable in thick disks. The composite disks have been fabricated into transducers with air-backing and with no front face matching layer, and their performance characteristics have been evaluated in water. The transmitting and receiving voltage responses of a PZT/P(VDF-TrFE) composite transducer are better than those of a PZT/epoxy composite transducer. The transmitting and receiving voltage responses are improved when the PZT rods and copolymer matrix are poled in opposite directions, especially when the resonance frequencies of the H- and T-modes are approximately equal. When the phases are poled in the same direction and the resonance peaks associated with the Hand T-modes just overlap, the bandwidth is improved. Using 0.33-mm thick composite disks, a transducer can be produced with three operating frequencies by poling the constituent phases in the same direction, or with two operating frequencies at equal efficiency by poling the constituent phases in opposite directions. The PZT/P(VDF-TrFE) 1-3 composite transducer, especially the one with multiple operating frequencies, should be very promising in the applications of medical ultrasonic imaging.

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Section: Introductionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lead zirconate titanate/poly(vinylidene fluoride-trifluoroethylene) 1-3 composites for ultrasonic transducer applications

Kwok

Chan

Choy

1999

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…Piezoelectric 1–3 [13, 14] and 2–2 [15] composites are also commonly used in transducer technology. The higher k coefficients and better impedance matching can lead to higher transducer sensitivity and improved bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric single crystal ultrasonic transducers for biomedical applications

Zhou

Lam

Zheng

et al. 2014

Progress in Materials Science

334

174

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Piezoelectric single crystals, which have excellent piezoelectric properties, have extensively been employed for various sensors and actuators applications. In this paper, the state–of–art in piezoelectric single crystals for ultrasonic transducer applications is reviewed. Firstly, the basic principles and design considerations of piezoelectric ultrasonic transducers will be addressed. Then, the popular piezoelectric single crystals used for ultrasonic transducer applications, including LiNbO3 (LN), PMN–PT and PIN–PMN–PT, will be introduced. After describing the preparation and performance of the single crystals, the recent development of both the single–element and array transducers fabricated using the single crystals will be presented. Finally, various biomedical applications including eye imaging, intravascular imaging, blood flow measurement, photoacoustic imaging, and microbeam applications of the single crystal transducers will be discussed.

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“…The effective parameters of 1-3 composite in 1-3-2 composite could be calculated by Chan's model of 1-3 composite [11]. Eq.…”

Section: The Effective Properties Of 1-3-2 Piezoelectric Compositementioning

confidence: 99%

Researching on resonance characteristics influenced by the structure parameters of 1-3-2 piezocomposites plate

Qin

Wang³

et al. 2008

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The 1-3-2 composite is made of 1-3 composite and ceramic base. Its effective properties are calculated based on the linear piezoelectric theory and uniform field theory. The influence of piezoelectric phase volume fraction and composite aspect (thickness/width) on resonance characteristic of square 1-3-2 piezoelectric composite plate has been researched. In addition, some 1-3-2 composite samples were fabricated by dice-fill technology. The resonance frequency of samples was investigated. The results show that the experiment agrees well with the calculation. The pure thickness resonance mode of 1-3-2 composite will be gained when the volume fraction of ceramic bottom is less than 30%; that of ceramic rods is in the range of 30 approximately 80% and the ratio of thickness to width is less than 0.35.

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Simple model for piezoelectric ceramic/polymer 1–3 composites used in ultrasonic transducer applications

Cited by 23 publications

References 0 publications

Lead zirconate titanate/poly(vinylidene fluoride-trifluoroethylene) 1-3 composites for ultrasonic transducer applications

Lead zirconate titanate/poly(vinylidene fluoride-trifluoroethylene) 1-3 composites for ultrasonic transducer applications

Piezoelectric single crystal ultrasonic transducers for biomedical applications

Researching on resonance characteristics influenced by the structure parameters of 1-3-2 piezocomposites plate

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