1-3 single-crystal composites for ultrasonic transducer arrays

Timothy A. Ritter; K. Kirk Shung; Seung Eek Eagle Park; Xuecang Geng; Thomas R. Shrout

doi:10.1117/12.308008

1 May 1998 1-3 single-crystal composites for ultrasonic transducer arrays

Timothy A. Ritter, K. Kirk Shung, Seung Eek Eagle Park, Xuecang Geng, Thomas R. Shrout

Proceedings Volume 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering; (1998) https://doi.org/10.1117/12.308008
Event: Medical Imaging '98, 1998, San Diego, CA, United States

Abstract

The development of single crystal relaxor-PT piezoelectrics is an exciting advance in ultrasound transducer technology. The high electromechanical coupling coefficients and variable dielectric constant could be used to significantly enhance bandwidth and sensitivity of array transducers. In this study 1-3 composites of single crystal material were engineered and applied to an array design. Both predicted and actual performances are reported and compared to array designs using PZT-5H based 1-3 composite material. In order to take advantage of the performance enhancement of single crystal materials a 1-3 composite connectivity was selected. Two techniques were used to tile together small pieces of crystal into a larger composite plate suitable for array applications. A coupling coefficient of .81 and an acoustic impedance of 15.6 Mrayls were obtained using a 58% volume fraction of single crystal. A comparable PZT composite displayed a coupling coefficient of .66 and an acoustic impedance of 1 7.0 Mrayls. A sufficiently fine spatial scale resulted in lateral resonances being well above the thickness mode resonance for both materials. One-dimensional modeling using the Redwood equivalant circuit in PSpice was used to investigate matching and backing. An optimization scheme resulted in a modeled bandwidth of 134% and a -6 dB pulse length of only one cycle using a single front matching layer and a castable backing. Eight element arrays of single crystal and PZT-5H composite were constructed to verify the theoretical results.

Citation Download Citation

Timothy A. Ritter, K. Kirk Shung, Seung Eek Eagle Park, Xuecang Geng, and Thomas R. Shrout "1-3 single-crystal composites for ultrasonic transducer arrays", Proc. SPIE 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering, (1 May 1998); https://doi.org/10.1117/12.308008

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available