Apparatus and method for determining thickness

Details Apparatus and method for determining thickness Apparatus and method for determining thickness

1980-12-24

1983-11-08

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

73628, G01N 2900

Patent

active

044135173

ABSTRACT:
Apparatus and method for measuring the thickness of a test piece by obtaining the acoustic velocity of the test piece where an ultrasonic wave is refracted into the test piece at a first point and the wave travels substantially parallel to the surface and the transit time to a second point where the wave is refracted out of the test piece is measured. The distance between the first and second points is known and the ultrasonic wave is initially transmitted into a member of different acoustic velocity than the test piece to produce the subsurface wave in the test piece.

REFERENCES:
patent: 2667780 (1954-02-01), Valkenburg
patent: 3504532 (1970-04-01), Muenow et al.
patent: 3534609 (1970-10-01), Grenfell et al.
patent: 3720098 (1973-03-01), Dixon
patent: 3844163 (1974-10-01), Leo

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