DocumentCode :
3229847
Title :
Novel concept of array transducer element using combined resonance between oscillations of hemispherical piezoceramic shell and bulk water
Author :
Otsu, Kenji ; Yoshizawa, Shin ; Umemura, Shin-ichiro
Author_Institution :
Dept. of Biomed. Eng., Tohoku Univ., Sendai, Japan
fYear :
2011
fDate :
18-21 Oct. 2011
Firstpage :
2181
Lastpage :
2184
Abstract :
For therapeutic ultrasound array transducers, it is required to reduce the electrical impedance of their elements so that the transducer can produce high ultrasonic power at a relatively low drive voltage. For this purpose, we are investigating a new concept of piezoceramic element using its breathing mode. Numerical simulation showed that a concave hemispherical piezoceramic shell with a diameter on the order of a wavelength in water is effective for obtaining good acoustic matching with water. High acoustical coupling was achieved by utilizing the combined resonance between the breathing-mode oscillation of the piezoceramic shell and the volume oscillation of a water sphere half enclosed by the shell.
Keywords :
biomedical materials; biomedical transducers; biomedical ultrasonics; oscillations; piezoceramics; ultrasonic transducer arrays; water; acoustic matching; acoustical coupling; array transducer element; breathing mode; bulk water; combined resonance; concave hemispherical piezoceramic shell; electrical impedance; high ultrasonic power; numerical simulation; oscillations; piezoceramic element; therapeutic ultrasound array transducers; water sphere; Acoustics; Arrays; Ceramics; Impedance; Oscillators; Resonant frequency; Transducers; array transducer; breathing mode; bulk water sphere; hemispherical shell; piezocermic;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium (IUS), 2011 IEEE International
Conference_Location :
Orlando, FL
ISSN :
1948-5719
Print_ISBN :
978-1-4577-1253-1
Type :
conf
DOI :
10.1109/ULTSYM.2011.0541
Filename :
6293407
Link To Document :
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