Title :
5C-3 A 40 MHz Linear Array based on a 1-3 Composite with Geometric Elevation Focussing
Author :
Needles, A. ; Foster, F.S. ; Brown, J.A. ; Lockwood, G.R.
Abstract :
The fabrication and performance of a high-frequency (40 MHz) linear array is described. A PZT-polymer composite material was fabricated in order to serve as a flexible piezoelectric substrate. The array pattern was created using photolithography to define the electrodes, and ultrasonic wire bonding to make electrical contacts. 256 linear elements were defined with 40-micron pitch. A geometric elevation focus was formed with a 6 mm radius of curvature. The two-way -6 dB bandwidth of the resulting transducer was 50%. The one-way directivity for a single array element was found to be 24 degrees and the -3dB oneway elevation beamwidth was measured as 112 mum
Keywords :
composite materials; polymers; ultrasonic focusing; ultrasonic transducer arrays; 40 MHz; PZT-polymer composite; electrical contacts; electrodes; geometric elevation focusing; photolithography; piezoelectric substrate; transducer array; ultrasonic wire bonding; Bandwidth; Bonding; Composite materials; Contacts; Electrodes; Fabrication; Lithography; Piezoelectric transducers; Ultrasonic transducer arrays; Wire;
Conference_Titel :
Ultrasonics Symposium, 2006. IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
1-4244-0201-8
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2006.77