Method and apparatus for generating and detecting acoustic surfa

Details Method and apparatus for generating and detecting acoustic surfa Method and apparatus for generating and detecting acoustic surfa

1980-09-25

1982-07-13

Ruehl, Charles A.

Measuring and testing

Vibration

By mechanical waves

73644, 310313R, G01N 2900

Patent

active

043388205

ABSTRACT:
A method and apparatus for generating and detecting acoustic surface waves particularly useful in the non-destructive testing of materials. In this method, the acoustic surface wave is generated in the test sample by a generator transducer coupled to the test sample so as to cause the acoustic wave to impinge on it at the required critical angle. The acoustic surface wave is detected by a pair of spaced steel wedges having their narrow ends in contact with the surface of the test sample so as to detect the shear component of the acoustic surface wave and to generate bulk waves in the steel wedges which travel away from the plane of the contact surface to pick-up transducers. In one described embodiment, the steel wedges provide two spaced, rounded-surface, long-line contacts with the test sample; and in a second described embodiment, a three-member contact is provided in which two of the members are defined by rounded-surface short-line contacts of the wedges, and a third, stabilizing contact is provided by a ball.

REFERENCES:
patent: 3340953 (1967-09-01), Zemanek, Jr.
patent: 3580057 (1971-05-01), Seegmiller
patent: 4059989 (1977-11-01), Halsey
Gordon, Jr.-Measurement of Applied and Residual Stresses Using an Ultraso Instrumentation System-ISA Transactions, vol. 19, No. 2, 1980, pp. 33-41.

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