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US 4,052,889 AGranted
System for measurement of subsurface fatigue crack size
AssigneeAdaptronics, Inc.
InventorsAnthony N. Mucciardi, Ramesh Shankar
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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.
Claims24
A system for measurement of surface and subsurface material flaw size which comprises,
- a. means for obtaining data as a function of a flaw in a medium,
- b. means to perform spectral analysis on said data,
- c. means to perform a cepstral analysis on said data,
- d. means responsive to the output of both (b) and (c) to provide a set of parameters;
- and
- e. means responsive to predetermined ones of said parameters to provide an estimated flaw length indication
3 more elements
Dependencies are inferred from the claim text.