Metal working – Piezoelectric device making
Patent
1987-11-30
1988-11-29
Hall, Carl E.
Metal working
Piezoelectric device making
264 22, 264225, 264275, 264320, 310365, 310371, 310800, H01L 4122
Patent
active
047871261
ABSTRACT:
A dark field ultrasonic transducer is constructed with an outer annular spherical or conical transducer element and an inner spherical element. The outer annular element is excited and insonifies a small portion of a part surface near a discontinuity or crack with longitudinal waves or with surface waves. The inner dark field element is not focused to be sensitive to either reflected sound or waves reradiated from the surface waves, but detects sound scattered from surface discontinuities such as a crack edge. When surface waves strike a crack edge and restrike it after reflection from the bottom of the crack, two pulses are received and the time delay between them is a measure of crack depth. The crack shape and crack depth profile are determined as the part is scanned. A sphere-cone transducer, the preferred embodiment, is fabricated by stretching thin piezoelectric polymer film over a tool having a ball embedded in a conical surface.
REFERENCES:
patent: 2616198 (1952-11-01), Sewell
patent: 4346505 (1982-08-01), Lemonon et al.
patent: 4384394 (1983-05-01), Lemonon et al.
Campbell Donald R.
Davis Jr. James C.
General Electric Company
Hall Carl E.
Webb II Paul R.
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