Laser generation of ultrasonic waves for nondestructive testing

Details Laser generation of ultrasonic waves for nondestructive testing Laser generation of ultrasonic waves for nondestructive testing

1975-05-27

1976-09-07

Gill, James J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73 715US, G01N 2904

Patent

active

039787133

ABSTRACT:
An object is tested for thickness or for presence and location of flaws by impacting a pulsed laser beam on the surface of the object so as to generate ultrasonic waves by rapid heating of a thin surface layer thereon. The reflected ultrasonic echo in the object is detected by monitoring surface motion with a rough surface interferometer.

REFERENCES:
patent: 3782177 (1974-01-01), Hoop
"Excitation of Surface Elastic Waves by Transient Surface Heating" by Lee et al., from Applied Physics Letters 1/68 pp. 12-14.
"Generation of Elastic Waves by Transient Surface Heating" by White, from Journal of Applied Physics 12/63 pp. 3559-3567,

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