Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1993-06-15
1995-02-21
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367157, 310334, 12866203, H01L 4102, H01L 4108
Patent
active
053922590
ABSTRACT:
An ultrasonic probe including one or more piezoelectric ceramic elements mounted on an acoustically damping support body. Desired acoustic signals are transmitted and received through a front portion of the probe while unwanted acoustic signals are dampened by the support body at the rear portion of the probe. Each element has a respective rear face and a respective piezoelectric ceramic layer integral therewith to provide efficient acoustic coupling between the element and the acoustically damping support body. The respective piezoelectric layer of each element includes shallow grooves disposed on the respective rear 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 a bulk acoustic impedance of the element and an acoustic impedance of the acoustically damping support body. 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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