Method and apparatus for ultrasonic detection of near-surface di

Details Method and apparatus for ultrasonic detection of near-surface di Method and apparatus for ultrasonic detection of near-surface di

1981-06-30

1983-04-26

Ciarlante, Anthony V.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73602, G01N 2904

Patent

active

043809294

ABSTRACT:
Near-surface discontinuities, or flaws, within a workpiece are determined by transmitting acoustic energy into the workpiece. If a discontinuity is present the acoustic energy will resonate in the section of the material between the discontinuity and the surface. Acoustic energy emerging from the section as a result of the resonating is detected and analyzed to determine this fundamental frequency, from which the half wavelength and depth of the discontinuity may be determined. The procedure is also applicable for determining the thickness of relatively thin sheets of material.

REFERENCES:
patent: 3662289 (1972-05-01), Adler et al.
patent: 3776026 (1973-12-01), Adler et al.
patent: 3996791 (1976-12-01), Niklas et al.
patent: 4052889 (1977-10-01), Mucciaroi

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