Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-01-15
1995-02-14
Williams, Hezron E.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310334, 310800, 310327, 367158, 367165, H01L 4108
Patent
active
053898486
ABSTRACT:
An ultrasonic transducer employed for both transmitting ultrasonic acoustic energy into an immersion medium and for detecting acoustic energy reflected from an object under examination is provided, the transducer having a hybrid transmitter and receiver in which a ceramic piezoelectric material is used to construct a first piezoelectric element for transmitting the acoustic energy, and a polymer piezoelectric material is used to fabricate a second piezoelectric element for receiving the reflected acoustic energy. The hybrid ultrasonic transducer provides improved performance over prior transducers using only a single ceramic piezoelectric element, in that the good transmitting properties of the ceramic are preserved, while the better receiving properties of the polymer piezoelectric are used to improve the sensitivity of the transducer. The polymer piezoelectric has the further advantage of providing a closer match of acoustic impedance to the immersion fluid used in the evaluation of objects.
REFERENCES:
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patent: 4356422 (1982-10-01), van Maanen
patent: 4382201 (1983-05-01), Trzaskos
patent: 4383194 (1983-05-01), Ohigashi et al.
patent: 4427912 (1984-01-01), Bui et al.
patent: 4737939 (1988-04-01), Ricketts
patent: 5166573 (1992-11-01), Brown
Finley Rose M.
General Electric Company
Webb II Paul R.
Williams Hezron E.
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