Single crystal metal wedges for surface acoustic wave propagatio

Details Single crystal metal wedges for surface acoustic wave propagatio Single crystal metal wedges for surface acoustic wave propagatio

1980-05-09

1982-01-26

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310336, 73627, 73644, H01L 4108

Patent

active

043130704

ABSTRACT:
An ultrasonic testing device has been developed to evaluate flaws and inhomogeneities in the near-surface region of a test material. A metal single crystal wedge is used to generate high frequency Rayleigh surface waves in the test material surface by conversion of a slow velocity, bulk acoustic mode in the wedge into a Rayleigh wave at the metal-wedge test material interface. Particular classes of metals have been found to provide the bulk acoustic modes necessary for production of a surface wave with extremely high frequency and angular collimation. The high frequency allows flaws and inhomogeneities to be examined with greater resolution. The high degree of angular collimation for the outgoing ultrasonic beam permits precision angular location of flaws and inhomogeneities in the test material surface.

REFERENCES:
patent: 2912854 (1959-11-01), Schubring
patent: 3515911 (1970-06-01), Byram et al.
patent: 3654500 (1972-04-01), Claiborne

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