Electricity: measuring and testing – Magnetic – Displacement
Patent
1997-12-12
1999-08-24
Strecker, Gerard
Electricity: measuring and testing
Magnetic
Displacement
73660, 324164, 32420712, 324225, 324239, 336 84R, G01B 714, G01P 344, G01N 2772, H01F 2736
Patent
active
059428937
ABSTRACT:
An eddy current sensor comprises a generally E-shaped core having three parallel legs joined together by a bridge. Current carrying coils are mounted on each of the outer legs and a signal coil is mounted on the central leg. Identical a.c. currents are caused to flow through the two outer coils for generating two magnetic fields which combine to form a sensing magnetic field extending outwardly from the ends of the legs for sensing purposes but which cancel one another within the central leg. The sensor is disposed within an E-shaped, hollow shield of an eddy current producing, electrically conductive material. The sensor fits within the shield as fingers in a glove with the parallel legs of the sensor magnetically separated from one another by walls of the shield. Only the ends of the sensor legs are exposed through apertures through the shield for emergence of the various magnetic fields. The shield cancels unwanted fringing fields and better guides the magnetic fields in desired directions.
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General Dynamics Advanced Technology Systems
Strecker Gerard
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