Pad-printed thick-film transducers for high-frequency and high-power applications

Wanda W. Wolny; Jeffrey A. Ketterling; Franck Levassort; Rasmus Lou-Moeller; Erwan Filoux; Jonathan Mamou; Ronald H. Silverman; Marc Lethiecq

doi:10.1117/12.878230

25 March 2011 Pad-printed thick-film transducers for high-frequency and high-power applications

Wanda W. Wolny, Jeffrey A. Ketterling, Franck Levassort, Rasmus Lou-Moeller, Erwan Filoux, Jonathan Mamou, Ronald H. Silverman, Marc Lethiecq

Author Affiliations +

Proceedings Volume 7968, Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy; 79681C (2011) https://doi.org/10.1117/12.878230
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

High-frequency-ultrasound transducers are widely used but are typically based either on planar piezoceramic sections that are lapped down to smaller thicknesses or on piezopolymers that may be deformed into more complex geometries. Piezoceramics then require dicing to obtain arrays or can be fractured into spherical geometries to achieve focusing. Piezopolymers are not as efficient for very small element sizes and are normally available only in discrete thicknesses. Thick-film (TF) transducers provide a means of overcoming these limits because the piezoelectric film is deposited with the required thickness, size and geometry, thus avoiding any subsequent machining. Thick-film transducers offer the potential of a wide range of geometries such as single-elements and annular or linear arrays. Here, a single-element focused transducer was developed using a piezoceramic composition adapted to high-power operation which is commonly used at standard MHz frequencies. After fabrication, the transducer was characterized. Using specific transmit-receive electronics and a water tank adapted to high-frequency devices, the transducer was excited using a short pulse to evaluate its bandwidth and imaging capabilities. Finally, it was excited by a one-period sine wave using several power levels to evaluate its capacity to produce high-intensity focused ultrasound at frequencies over 20 MHz.

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Wanda W. Wolny, Jeffrey A. Ketterling, Franck Levassort, Rasmus Lou-Moeller, Erwan Filoux, Jonathan Mamou, Ronald H. Silverman, and Marc Lethiecq "Pad-printed thick-film transducers for high-frequency and high-power applications", Proc. SPIE 7968, Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy, 79681C (25 March 2011); https://doi.org/10.1117/12.878230

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KEYWORDS

Transducers

Optical spheres

Acoustics

Electrodes

In vivo imaging

Ferroelectric materials

Heart

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