Method and apparatus for producing a pulse type ultrasonic wave

Details Method and apparatus for producing a pulse type ultrasonic wave Method and apparatus for producing a pulse type ultrasonic wave

1977-12-01

1978-10-24

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

041214692

ABSTRACT:
A method and apparatus for producing on the surface of a workpiece an ultrasonic pulse wave without physical contact comprise the use of a laser beam illuminating a small, striplike, portion of the workpiece surface and such portion being moved with uniform motion along a linear axis over a predetermined distance. The angle of propagation of the resulting ultrasonic wave is a function of the propagation velocity of sound in the workpiece and the velocity of the illuminated portion along the linear axis.

REFERENCES:
patent: 3978713 (1976-09-01), Penney

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