Method and apparatus for producing ultrasonic waves in light abs

Details Method and apparatus for producing ultrasonic waves in light abs Method and apparatus for producing ultrasonic waves in light abs

1977-10-04

1979-02-06

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73643, G01N 2900

Patent

active

041377788

ABSTRACT:
In order to stabilize the acoustic wave amplitude in a workpiece, where such acoustic wave is generated by a laser beam pulse transmitted upon the workpiece surface, laser pulses preceding the laser pulse used for acoustic evaluation are utilized to clean the workpiece surface from contamination. Cleaning of the workpiece surface to the bare metal provides a normalized surface condition in respect to absorbed pulsed laser beam energy and, hence, produces acoustic waves of substantially constant amplitude. Either the same laser producing the acoustic wave or a separate laser is used for vaporizing contamination at the workpiece surface where an acoustic wave is subsequently to be produced.

REFERENCES:
patent: 3503804 (1970-03-01), Schneider
patent: 3978713 (1976-09-01), Penney
White, "Generation of Elastic Waves by Transient Surface Heating", Journal of Applied Physics, vol. 34, No. 12, pp. 3559-3567, Dec. 1963.

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