Frequency-selective ultrasonic sandwich transducer

Details Frequency-selective ultrasonic sandwich transducer Frequency-selective ultrasonic sandwich transducer

1994-09-07

1995-10-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310327, 310340, 310345, H01L 4108

Patent

active

054573530

ABSTRACT:
For certain applications, such as detecting of glass breakage, it is advantageous to use frequency-selective ultrasonic transducers. In this case, one can dispense with using costly filter configurations to filter out relevant frequency components of the received ultrasonic spectrum. An ultrasonic sandwich transducer, which shows a high sensitivity for certain predetermined frequencies, can be produced by selectively adapting at least one of its geometric dimensions to the frequency selectivity which is required of the transducer. The ultrasonic sandwich transducer preferably has a piezoelectric-ceramic wafer, which is surrounded on at least one of its two wafer surfaces by a layer of low acoustical impedance. The piezoelectric-ceramic wafer is effectively rectangular, resulting in a block-shaped member. One of the dimensions of height, length and width is fixed to correspond to a desired fundamental frequency.

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