Apparatus for nondestructive workpiece inspection employing ther

Details Apparatus for nondestructive workpiece inspection employing ther Apparatus for nondestructive workpiece inspection employing ther

1983-08-08

1986-06-10

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73632, 73643, 73627, G01N 2904

Patent

active

045935653

ABSTRACT:
Method and apparatus for nondestructive inspection and detection of flaws in a workpiece according to four techniques is disclosed. Elastic waves are thermoelastically or electrodynamically induced in a workpiece by electric current energization of an elastic wave inducing source adapted to be disposed in contact with the workpiece remote from a defect. An acoustic sensor is disposed in elastic wave transmitting contact with the workpiece remote from the source and produces an output signal having an amplitude representative of received elastic waves. The presence of a crack, flaw or defect in the workpiece is detectable as a variation in the amplitude or other characteristics of the acoustic sensor output signal.

REFERENCES:
patent: 4267732 (1981-05-01), Quate
patent: 4338822 (1982-07-01), Yamaguchi et al.
patent: 4385634 (1983-05-01), Bowes
"20-MHz Acoustic Waves from Pulsed Thermoelastic Expansions of Constrained Surfaces", von Gutfeld et al., Applied Physics Letters, vol. 30, No. 6, Mar. 15, 1977, pp. 257-259.
"Experiments on Some Electrodynamic Ultrasonic Vibrators", Barone et al., Acustica, vol. 4 (1954), pp. 182-184.
"Generation of Elastic Waves by Transient Surface Heating", White, Journal of Applied Physics, vol. 34, No. 12, Dec. 1963, pp. 3559-3567.

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