Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1994-07-15
1996-03-26
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324225, 324262, G01N 2783, G01R 3312
Patent
active
055023827
ABSTRACT:
A magnetic inspection apparatus includes a magnetizer which generates a magnetic field in an object to be inspected, the object running in a predetermined direction, the magnetizer including a pair of magnetic poles provided in facing relation to the object, the pair of magnetic poles being arranged in the predetermined direction; a plurality of magnetic sensors arranged at small intervals in a widthwise direction of the object perpendicular to the predetermined direction, for detecting a leakage magnetic flux due to a defect of the object at locations in the widthwise direction, each magnetic sensor having sides which face the magnetic poles; a plurality of subtraction circuits, each calculating a difference signal between output signals from those ones of the magnetic sensors which are separated by a predetermined distance; a plurality of absolute value circuits, each calculating an absolute value of each difference signal output from each subtraction circuit; and an arithmetic operation circuit which evaluates the defect of the object on the basis of the absolute value signal output from each absolute value circuit, with the relationship between a distance E (unit=mm) between the magnetic sensors associated with the output signals subjected to subtraction in each subtraction circuit and a distance L (unit=mm) between each magnetic sensor and the object being defined by 17<EL<78.
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Ando Seigo
Matsufuji Yasuhiro
NKK Corporation
Strecker Gerard R.
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