Title :
Electrostrictive transducers for medical ultrasonic applications
Author :
Chen, Jie ; Shurland, Abe ; Perry, Jodi ; Ossmann, Bill ; Gururaja, T.R.
Author_Institution :
Imaging Syst., Hewlett-Packard Co., Andover, MA, USA
Abstract :
Ultrasonic phased or sector array transducers were built using PMN-PT based electrostrictive materials. Large field-induced piezoelectric coefficients were obtained in these relaxor-type materials at relatively low DC bias (Kt=0.43-0.50 at 5 KV/cm). The electrostrictive transducers have similar sensitivity and bandwidth compared to conventional PZT transducers. By choosing the appropriate composition and process, the sensitivity variation of electrostrictive transducers can be minimized to within 3 dB over the operating temperature range. The clinical results demonstrate the benefit of using electrostrictive materials to obtain elevation aperture control
Keywords :
biomedical equipment; biomedical ultrasonics; electrostriction; lead compounds; piezoceramics; piezoelectric transducers; ultrasonic transducer arrays; DC bias; PMN-PT based electrostrictive materials; PMN-PbTiO3; PbMgO3NbO3-PbTiO3; bandwidth; electrostrictive transducers; elevation aperture control; large field-induced piezoelectric coefficients; medical ultrasonic applications; operating temperature range; relaxor-type materials; sector array transducers; sensitivity; ultrasonic phased array transducers; Acoustic applications; Bandwidth; Biomedical transducers; Electrostriction; Phased arrays; Piezoelectric materials; Piezoelectric transducers; Temperature distribution; Ultrasonic transducer arrays; Ultrasonic transducers;
Conference_Titel :
Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on
Conference_Location :
East Brunswick, NJ
Print_ISBN :
0-7803-3355-1
DOI :
10.1109/ISAF.1996.602704
