Matching layer for front acoustic impedance matching of clinical ultrasonic tranducers
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United States of America Patent
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Jul 18, 1995
Grant Date -
N/A
app pub date -
Jun 15, 1993
filing date -
Jun 15, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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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