Method and apparatus for producing pulse-shaped acoustic waves o

Details Method and apparatus for producing pulse-shaped acoustic waves o Method and apparatus for producing pulse-shaped acoustic waves o

1977-12-01

1979-03-20

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

G10N 2904

Patent

active

041447670

ABSTRACT:
A method and apparatus for producing on the surface of a workpiece free of contact with a source of energy a pulse shaped ultrasonic shock wave comprise the use of laser means. A plurality of strip-shaped equidistantly spaced surface portions of the workpiece are pulsed with coherent light from the laser means in time delayed sequence. The angle of propagation of the ultrasonic wave is determined by the center-to-center distance between the strip-shaped surface portions illuminated with coherent light, the time delay between the light pulses and the velocity of propagation of the ultrasonic wave in the workpiece.

REFERENCES:
patent: 3166731 (1965-01-01), Joy
patent: 3251220 (1966-05-01), Joy
patent: 3978713 (1976-09-01), Penney
patent: 4080838 (1978-03-01), Kuroda et al.
J. Krautkramer et al., Werkstoffprufung mit Ultraschall, 3rd Ed., Springer-Verlag, 1975, pp. 149 & 150.

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