Multiphase backing materials for piezoelectric broadband transdu

Details Multiphase backing materials for piezoelectric broadband transdu Multiphase backing materials for piezoelectric broadband transdu

1983-05-09

1984-11-13

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, H01L 4108

Patent

active

044828357

ABSTRACT:
An acoustical transducer is provided with an acoustically absorbant backing material having an acoustical impedance precisely matching the impedance of the piezoelectric element in the transducer. The backing material is a multiphase mixture of selected materials, such as a low melting point alloy (InPb) and one or more powders having high impedance characteristics (tungsten and copper). The slope of the curve impedance versus volume fraction of the backing components is low, thus allowing the impedance of the material to be precisely controlled. The backing material is preferably electrically conductive and is fuzed to one surface of the piezoelectric element to further improve the output characteristics of the transducer.

REFERENCES:
patent: Re29785 (1978-09-01), Leschek et al.
patent: 2736823 (1956-02-01), Sheppard et al.
patent: 3553501 (1971-01-01), Thill

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