Measuring and testing – Vibration – By mechanical waves
Patent
1979-07-23
1981-06-23
Myracle, Jerry W.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
042742889
ABSTRACT:
Disclosed is a method for measuring the depth a of a surface flaw in an object, including the steps of irradiating the flaw with an incident acoustic surface wave signal, detecting a reflected acoustic surface wave signal, including a first portion reflected from the surface edge of the flaw and a second portion reflected from the bottom of the flaw, and analyzing the interference between the first and second portions of the reflected signal to determine the depth of the flaw. The analysis may be carried out by Fourier transforming the reflected signals from the time domain to the frequency domain, selecting a frequency f.sub.n for which a maximum or minimum amplitude is detected independent of the angle of detection, and calculating the depth a from the formula a=nV.sub.r /2f.sub.n, where n is an integer, and V.sub.r is the speed of an acoustic surface wave in the object.
REFERENCES:
patent: 3662589 (1972-05-01), Adler et al.
patent: 3996791 (1976-12-01), Niklas et al.
patent: 4052889 (1977-10-01), Mucciardi et al.
patent: 4098129 (1978-07-01), Deblaere et al.
Doyle, P. A. et al., Crack Depth Measurement by Ultrasonics: A Review, from Ultrasonics, Jul. 1978, pp. 164-170.
Ahlberg Lloyd A.
Tittmann Bernhard R.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Myracle Jerry W.
Rockwell International Corporation
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