Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1996-07-23
1998-05-12
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324220, 324232, 324235, 324242, G01N 2782, G01N 2790
Patent
active
057511446
ABSTRACT:
A magnetic inspection device for detecting structural faults in elongated magnetically permeable objects has two primary and opposite poles which induce a magnetic flux to place the object at least near magnetic saturation. At least one auxiliary pole is positioned on the inspection device between the primary poles and serves to change the level of the magnetic flux induced by the primary poles so as to induce eddy currents during relative movement of the inspection device and the object. At least one sensor positioned on the inspection device detects eddy current changes which are representative of structural faults.
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German article, Die elektromagnetische Prufung von Drahtseilen (The electromagnetic Testing Of Wire Cable) by Urs Balthasar Meyer (1973), Mitteilungen Aus Dem Institut Fur Electrische Machinen An Der ETH published by Juris Druck+ Verlag Zurich, pp. 107-109.
Nondestructive Testing Handbook, vol. 4, (1986) "Electromagnetic Testing", Eddy Current, Flux Leakage and Microwave Nondestructive Testing, pp. 212-215.
Thesis--Ein Beitrag zur magnetinduktiven Ouerschnittsmessung von Drahtseilen (A Contribution to the Magnetic-Inductive Measurement of Wire Cable Crosssections) by Wolfgang Rieger, University of Stuttgart, (1983) pp. 49 and 98.
NDT Technologies, Incorporated
Strecker Gerard R.
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