Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1998-03-31
2000-05-02
Strecker, Gerard
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324262, 194213, 194320, G01R 3312, G01N 2772, G07D 704, G01V 310
Patent
active
060576839
ABSTRACT:
An induction head for sensing a magnetic strip or other magnetically permeable security structures includes an exciting coil associated with an electrically conductive concentrator, which produces a primary field and induces a responsive secondary field in the concentrator. The concentrator has an endwall and sidewalls defining a central cavity. The endwall has a narrow measuring gap dividing the endwall into two opposed sections. The sidewalls are also interrupted adjacent the measuring gap to cause a concentrated current of the secondary field to pass along the gap. This concentrated current can be monitored for a change in induction due to the presence of an elongate magnetic strip or other magnetically permeable security structure which is moved past the measuring gap.
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Cashcode Company Inc.
Strecker Gerard
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