Focused spherical transducers for ultrasonic imaging

Author

Alkoy, Sedat ; Lopath, P.D. ; Newnham, R.E. ; Hladky-Hennion, Anne-Christine ; Cochran, Joe K.

Author_Institution

Pennsylvania State Univ., University Park, PA, USA

Volume

2

fYear

1997

fDate

5-8 Oct 1997

Firstpage

991

Abstract

Spherically focused transducers were from miniature thin-wall lead zirconate titanate hollow spheres (BBs). The spheres were prepared from slurries of soft PZT powders using a coaxial nozzle process, and had diameters ranging from 1 to 6 mm and wall thickness from 12 to 150 μm. Two main vibrations modes, namely radial and thickness modes, were obtained around 1 MHz and 30-40 MHz, respectively. Focused transducers were prepared by machining sections of the hollow spheres. The transducers were characterized in pulse echo mode and by using finite element analysis (FEA). The results obtained from experiments were confirmed by FEA. The transducers were found to have a center frequency of ~48 MHz with a bandwidth of 22% and a minimum insertion loss of -44 dB

Keywords

finite element analysis; lead compounds; piezoceramics; piezoelectric transducers; ultrasonic focusing; ultrasonic imaging; ultrasonic transducers; 44 dB; 48 MHz; PZT; PbZrO3TiO3; bandwidth; center frequency; coaxial nozzle process; finite element analysis; focused spherical transducer; insertion loss; lead zirconate titanate hollow spheres; machining; pulse echo mode; radial mode; soft PZT powder slurry; thickness mode; ultrasonic imaging; vibration; Coaxial components; Finite element methods; Focusing; Machining; Powders; Slurries; Thin wall structures; Titanium compounds; Ultrasonic imaging; Ultrasonic transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE

Conference_Location

Toronto, Ont.

ISSN

1051-0117

Print_ISBN

0-7803-4153-8

Type

conf

DOI

10.1109/ULTSYM.1997.661747

Filename

661747