The role of piezocomposites in ultrasonic transducers

Smith, W.A.

doi:10.1109/ultsym.1989.67088

Cited by 223 publications

(82 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the other hand 1-3 and other piezocomposite technologies have received a large interest in low power applications like medical diagnostic [4] and non destructive testing.…”

Section: State Of the Art In Piezoceramic And Piezocomposite Technologymentioning

confidence: 99%

New piezocomposite transducers for therapeutic ultrasound

et al. 2003

View full text Add to dashboard Cite

The development of therapeutic applications of ultrasound depends notably on the availability of high-performance transducers. New piezocomposite technologies offer performances that have proved to be particularly well adapted for such applications thanks to high power density generation with high efficiency. Moreover this technology enables a wide variety of shapes and the design of array transducers for electronic focusing, scanning and steering of the beam. This article details these advantages as well as other interests such as a large bandwidth or the MRI compatibility allowing the imaging / therapy association. Furthermore, the feasibility of highly focused transducers and complex array structures will be illustrated through various examples.

show abstract

“…On the other hand 1-3 and other piezocomposite technologies have received a large interest in low power applications like medical diagnostic [4] and non destructive testing.…”

Section: State Of the Art In Piezoceramic And Piezocomposite Technologymentioning

confidence: 99%

New piezocomposite transducers for therapeutic ultrasound

et al. 2003

View full text Add to dashboard Cite

show abstract

“…One of the most interesting and elegant examples is a ceramic-polymer composite. The macroscopic engineering in piezoelectric composites is based on symmetry, connectivity, shape and the volume ratio of the two phases (2). The soft polymer matrix has multiple roles.…”

Section: Large Scale Engineeringmentioning

confidence: 99%

“…Properties of piezoelectric devices may be controlled in several ways, for example by intervening on piezoelectric material itself (by doping, solid solutions, grain-size and microstructure control) (1), by using advantages of composite structures (2), or by adjusting macroscopic structure and design of the piezoelectric element. On the most fundamental level, piezoelectric properties may be engineered by controlling the crystal-lattice (also called intrinsic) response.…”

Section: Introductionmentioning

confidence: 99%

Ingeniería de propiedades piezoeléctricas en cerámicas y láminas delgadas ferroeléctricas

Damjanović¹,

Chu²,

Taylor³

et al. 1999

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

The paper discusses different possibilities for controlling piezoelectric properties of ferroelectric materials and devices. The piezoelectric properties engineering can be made on different scales. Tuning of the piezoelectric response by controlling contributions from domain walls displacement is used to illustrate engineering on nanometer scale. Texture control in ferroelectric films and grain size control is discussed as an example of property control on micrometer scale. Finally, engineering on macroscopic (millimeter) scale is illustrated by amplification methods employed in multilayer actuators and different bimorph-type structures as well as by control of electro-mechanical properties in polymer-ceramic composites. Key Words: ferroelectric, piezoelectric, thin films, domain-wallsIngenier'a de propiedades piezoelŽctrias en cer ‡micas y l ‡minas delgadas ferroelŽctricas.El presente trabajo discute las diferentes posibilidades existentes en el control de las propiedades piezoelŽctricas de materiales ferroelŽctricos y dispositivos piezoelŽctricos. La ingenier'a de las propiedades piezoelŽctricas se puede llevar a cabo a diferentes niveles. El ajuste de dichas propiedades controlando las contribuciones del desplazamiento de paredes de dominios se usa para ilustrar el dise-o a escala nanomŽtrica. El control de la textura en l ‡minas delgadas ferroelŽctricas y el control del tama-o de grano ser ‡n tratados como un ejemplo del control de propiedades a nivel micromŽtrico. Por oeltimo, la ingenier'a de materiales a escala macrosc-pica (milimŽtrica) ser ‡ ilustrada mediante algunos mŽtodos de amplificaci-n empleados en actuadores multicapa y diferentes estructuras de tipo bimorfo, al igual que por mŽtodos de control de las propiedades electromec ‡nicas en materiales compuestos pol'merico-cer ‡micos.Palabras Clave: ferroelectricidad, piezoelectricidad, l ‡minas delgadas, paredes de dominios

show abstract

“…Mechanical forming to focus piezocrystal transducers has been achieved successfully using mechanical hard-press [15] and dimpling techniques [16], but reports are limited to single-element transducers. Other possibilities are to thermally form a 1-3 connectivity piezoelectric -polymer composite into the desired shape [17] or to use flexible polymers for flexible composites [18], but these may be difficult at the frequencies of interest here, below 1.0 MHz, and the values of volume fraction, e.g. VF > 50%, used in focused ultrasound applications.…”

Section: Introductionmentioning

confidence: 99%

Implementation of a PMN-PT piezocrystal-based focused array with geodesic faceted structure

Qiu

Démoré

et al. 2016

Ultrasonics

View full text Add to dashboard Cite

Abstract-The higher performance of relaxor-based piezocrystals compared with piezoceramics is now well established, notably including improved gain-bandwidth product, and these materials have been adopted widely for biomedical ultrasound imaging. However, their use in other applications, for example as a source of focused ultrasound for targeted drug delivery, is hindered in several ways. One of the issues, which we consider here, is in shaping the material into the spherical geometries used widely in focused ultrasound.Unlike isotropic unpoled piezoceramics that can be shaped into a monolithic bowl then poled through the thickness, the anisotropic structure of piezocrystals make it impossible to machine the bulk crystalline material into a bowl without sacrificing performance. Instead, we report a novel faceted array, inspired by the geodesic dome structure in architecture, which utilizes flat piezocrystal material and maximizes fill factor.Aided by 3D printing, a prototype with f#  1.2, containing 96 individually addressable elements was manufactured using 1-3 connectivity PMN-PT piezocrystal -epoxy composite. The fabrication process is presented and the array was connected to a 32-channel controller to shape and steer the beam for preliminary performance demonstration. At an operating frequency of 1 MHz, a focusing gain around 30 was achieved and the side lobe intensities were all at levels below -12 dB compared to main beam. We conclude that, by taking advantage of contemporary fabrication techniques and driving instrumentation, the geodesic array configuration is suitable for focused ultrasound devices made with piezocrystal.

show abstract

The role of piezocomposites in ultrasonic transducers

Cited by 223 publications

References 78 publications

New piezocomposite transducers for therapeutic ultrasound

New piezocomposite transducers for therapeutic ultrasound

Ingeniería de propiedades piezoeléctricas en cerámicas y láminas delgadas ferroeléctricas

Implementation of a PMN-PT piezocrystal-based focused array with geodesic faceted structure

Contact Info

Product

Resources

About