Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1993-06-15
1995-07-18
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367152, 367155, 367157, 310320, 12866203, H04R 1700
Patent
active
054348277
ABSTRACT:
An ultrasonic probe having one or more piezoelectric ceramic elements, each having a respective bulk acoustic impedance. Each element has a respective front face and a respective piezoelectric ceramic layer integral therewith to provide efficient acoustic coupling between the probe and a medium under examination by the probe. The respective piezoelectric layer of each element includes shallow grooves disposed on the respective front face of each piezoelectric element. A groove volume fraction of the piezoelectric layer is selected to control acoustic impedance of the piezoelectric layer so as to provide a desired acoustic impedance match between the bulk acoustic impedance of the element and an acoustic impedance of a medium under examination by the probe. Electrodes extend into and contact the grooves, imposing electrical boundary requirements that support a desired electrical field distribution within the element.
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Eldred J. Woodrow
Hewlett--Packard Company
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