System for generating or sensing transverse elastic bulk waves i

Details System for generating or sensing transverse elastic bulk waves i System for generating or sensing transverse elastic bulk waves i

1971-12-10

1976-03-23

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

310 8, 310 98, 310 81, 333 30R, 73 675R, H01L 4104

Patent

active

039462560

ABSTRACT:
A device for generating or sensing transverse elastic bulk waves in solids includes a piezoelectric material engaging a surface of the solid and having a two-fold axis or equivalent symmetry extending parallel to the surface of the solid. A pair of electrodes are located on a surface of the transducer extending perpendicular to the surface of the solid which the material contacts. Each electrode has one or more conductive fingers elongated in a direction parallel to the two-fold axis of the material. The fingers of the electrodes are interlaced. When used as a generator of bulk waves, a source of alternating voltage excites the electrodes. The electrodes thus generate deep surface waves in the piezoelectric material which are transformed into bulk waves in the test solid. Similarly, bulk waves in the test solid are transformed into deep surface waves in the piezoelectric material which may then be sensed by the electrodes.

REFERENCES:
patent: 2587414 (1952-02-01), Valkenburg et al.
patent: 2921134 (1960-01-01), Greenspan et al.
patent: 3343105 (1967-09-01), Van Der Pauw
patent: 3360749 (1967-12-01), Sittig
patent: 3400340 (1968-09-01), Papadakas
patent: 3512400 (1970-05-01), Lynnworth
patent: 3518582 (1970-06-01), Pizzarello
patent: 3611203 (1971-10-01), Cooper
Surface Elastic Waves, by R.M. White, Proceedings of IEEE Vol. 58, No. 8, Aug. 1970, pp. 1238-1276.

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