Ultrasonic method for measurement of size of any flaw within sol

Details Ultrasonic method for measurement of size of any flaw within sol Ultrasonic method for measurement of size of any flaw within sol

1988-07-06

1990-04-10

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73600, G01N 2904

Patent

active

049149520

ABSTRACT:
The present invention provides an ultrasonic method for measuring the size of a possible flaw in a solid mass, in which an ultrasound is transmitted perpendicularly to the searching surface of a solid mass being the object under measurement through a liquid, a ratio in sound pressure between a reflected wave of the ultrasound from the surface of the solid mass and a reflected wave from any flaw in the solid, and a distance from the surface of the solid mass to the flaw, derived from the difference in time of reception between the reflected wave from the surface of the solid mass and the reflected wave from the flaw in the solid mass, are taken as indices of evaluation, and these indices of evaluation are compared with a reference value obtained beforehand by measuring a test piece made of a same material as that of the solid mass, thereby determining the size of the flaw. So, it is possible, with the present invention, to measure easily, very rapidly, accurately, quantitatively and non-destructively the size of a possible flaw in the parts or members composing any electrical or mechanical equipment.

REFERENCES:
patent: 3608361 (1971-09-01), Krautkramer et al.
Krautkramer, J. et al., "Ultrasonic Testing of Materials", 2nd Edn., Sec. 5.1 (1977) pp. 90-96.

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