Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1992-06-26
1994-05-10
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324225, 324237, G01N 2772, G01R 3312
Patent
active
053111281
ABSTRACT:
An eddy current imaging system includes an eddy current sensing coil positioned proximate a workpiece for scanning the workpiece to produce a signal indicative of the integrity of the workpiece for regions in an x,y array of data. Such a signal may be a complex impedance signal representative of the amplitude and/or the phase of the signal. Two data processing techniques are disclosed for enhancing the display of a flay in the workpiece. The first includes the step of calculating a spatial derivative of the amplitude and/or phase indicative signal from the coil and providing an image of the spatial derivative to produce a C scan of the spatial derivative. The second includes the steps of determining the regions of maximum ascent and/or descent of the signal for regions in the scan and calculating an impedance plane trajectory from the data array of path points for displaying a reconstructed optimum signal independent of path pattern.
REFERENCES:
patent: 4470122 (1984-09-01), Sarr
patent: 4555664 (1985-11-01), David et al.
patent: 4755753 (1988-07-01), Chern
patent: 4836026 (1989-06-01), P'an
E. J. Chern and A. L. Thompson, "Eddy Current Imaging For Material Surface Mapping" prepared in about Aug., 1986.
M. W. Kirby, J. P. Lareau, and D. S. Leonard, "Eddy Current Imaging of Aircraft Using Real Time Signal Processing" presented at the quantitative NDE conference in Jul., 1989.
Lareau John P.
Leonard David S.
Abb Amdata Inc.
Kananen Ronald P.
Mulholland John H.
Snow Walter E.
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