Hybrid ultrasonic transducer

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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Details

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:
patent: 4354132 (1982-10-01), Borburgh et al.
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

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