Ultrasonic transducer with selectable center frequency

Details Ultrasonic transducer with selectable center frequency Ultrasonic transducer with selectable center frequency

1993-12-20

1995-01-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, 310337, 310 26, H01L 4108

Patent

active

053810686

ABSTRACT:
An ultrasonic transducer with a selectable center frequency is provided. The transducer is made of a composite including a piezoelectric base and a plurality of elongated rods made of a material having a coefficient of elasticity substantially responsive to a control signal applied thereto. In one embodiment the rod material is a suitable magnetostrictive alloy in which case the control signal is a magnetic field. In another embodiment, the rod material is a suitable shape memory alloy in which case the control signal is a thermal signal. In either case, the level of the respective control signal, i.e., the level of the magnetic field or the temperature level, allows for selectively shifting the center frequency of the ultrasound beam produced by the transducer.

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