Title :
Medical ultrasonic transducers with switchable frequency bands centered about f0 and 2f0
Author :
Gururaja, T.R. ; Shurland, Abraham ; Chen, Jie
Author_Institution :
Hewlett-Packard Co., Andover, MA, USA
Abstract :
We present a novel type of ultrasonic imaging transducer in which the operating frequency can be switched between two distinct bands centered about f0 and 2f0. In effect, we can achieve greater than 100% transducer bandwidth at the -6 dB level. The transducer is based on using DC bias induced piezoelectricity in electrostrictive materials such as lead magnesium niobate-lead titanate (PMN-PT) relaxor ferroelectric materials
Keywords :
acoustic impedance; biomedical transducers; biomedical ultrasonics; electrostriction; ferroelectric ceramics; ferroelectric devices; lead compounds; piezoceramics; piezoelectric transducers; ultrasonic transducers; DC bias induced piezoelectricity; PMN-PT relaxor ferroelectric materials; PMN-PbTiO3; PbMgO3NbO3-PbTiO3; electrostrictive materials; medical ultrasonic transducers; operating frequency; switchable frequency bands; transducer bandwidth; ultrasonic imaging transducer; Bandwidth; Biomedical imaging; Biomedical transducers; Ferroelectric materials; Frequency; Piezoelectric materials; Piezoelectric transducers; Piezoelectricity; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.663314
