Bilayer ultrasonic transducer having reduced total electrical im

Details Bilayer ultrasonic transducer having reduced total electrical im Bilayer ultrasonic transducer having reduced total electrical im

1994-11-21

1997-01-28

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310327, 310331, 310366, H01L 4108

Patent

active

055980511

ABSTRACT:
An ultrasonic transducer having reduced total electrical impedance is constructed by stacking a plurality of piezoelectric transducer element arrays on top of each other. For a given thickness, the electrical impedance of a multilayer stack of piezoelectric transducer element arrays is a function of the number of layers. If the number of layers equals two, then the electrical impedance of the total stack-up of layers is reduced by a factor of one-quarter relative to the electrical impedance of a single layer of equal thickness. This facilitates matching the overall transducer impedance to that of the connecting cable.

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Goldberg et al., "Multi-Layer PZT Transducer Arrays for Improved Sensitivity", IEEE Ultrasonics Symposium, (1992), pp. 551-554.

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