Nukem Limited

Herbert Diehl

Gerhard Huschelrath

This invention provides for the non-destructive testing of a longitudinally displaceable ferromagnetic body for structural faults. This device sends a stationary magnetic field transversely across the body of the test piece. Changes in this magnetic field, due to structural defects of the test piece, are detected by the magnetic field detectors which are placed on the periphery of the test piece in alignment with the stationary magnetic field. The changes detected by the magnetic field detectors must be processed in order to be useful. This processing requires compensation for the varying strength of the magnetic field at the surface of each different magnetic field detector, compensation for unequal sensitivities of each individual magnetic field detector in detecting structural defects, and also compensating for the tolerances of circuits which are used in the previous compensations.

Device for the non-destructive testing of ferromagnetic bodies and a

The object of the invention is a device with two Hall generators (12, 14) for measuring the gradients of magnetic leakage fields in the non-destructive testing of materials. The two Hall generators (12, 14) are arranged at a distance from each other with their broad sides on a flat carrier substrate (18). They are positioned along a common line (36) with respect to which they each have the same alignment. Furthermore the two Hall generators are arranged close to the edges (40) of two opposite sides of the carrier substrate (18) that are free of connections.

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Erlensee, Germany

Herbert Diehl