Apparatus for discriminating defects in top and bottom surfaces of objects
AssigneeMagnetic Analysis Corporation
InventorsZhongging You, Robert A. Brooks, Richard Colman, Paul J. Bebick
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Abstract
Apparatus for non-destructive examination of a plate for defects existing in one of both of opposed first and second surfaces thereof includes a rotatable support platform, an eddy current coil structure for inducing eddy currrents in the plate located at a first location in the platform, a first magnetic flux generator disposed at a second location in the platform, the second location being opposite the first location on a line extending from the first location through the platform center. A drive unit rotates the platform relative to the plate.
Claims7
Apparatus for non-destructive examination of a plate for defects existing in one or both of opposed first and second surfaces thereof, said apparatuse comprising:
- (a) a platform supported for rotation relative to said plate about a center of said platform;
- (b) an eddy current coil structure for inducing eddy currents in said plate located at a first location in said platform remotely of said center thereof;
- (c) a magnetic flux leakage detecting coil structure located at said first location in said platform;
- (d) first magnetic flux generating means disposed at said first location in said platform;
- (e) second magnetic flux generating means disposed at a second location in said platform, said second location being diametrically opposite said first location and remote from said platform center;
- (f) drive means for rotating said platform relative to said plate;
- (g) signal processing means connected to said eddy current coil structure and to said magnetic flux leakage detecting coil structure and providing output signals indicative of characteristics of said induced eddy currents and characteristics of magnetic flux in said plate;
- and
- (h) display means for display of said output signals of said signal processing means.
Dependencies are inferred from the claim text.