System for measurement of subsurface fatigue crack size

Details System for measurement of subsurface fatigue crack size System for measurement of subsurface fatigue crack size

1976-06-10

1977-10-11

Myracle, Jerry W.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

G01N 2900

Patent

active

040528898

ABSTRACT:
A system for detecting and measuring subsurface fatigue cracks wherein acoustic pulse-echo data from the crack under test are manipulated to extract all acoustic characteristics by means of a Fourier operation, deconvolution and inverse Fourier operation, providing a spectral and cepstral analysis on these data and then utilizing the results of the spectral and cepstral analysis to obtain parameters which are utilized in an adaptive learning network to provide crack length measurements.

REFERENCES:
patent: 3924456 (1975-12-01), Vahaviolos
patent: 3961522 (1976-06-01), Kilen

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