Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1987-01-29
1988-11-15
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324241, 324242, 324262, G01N 2790
Patent
active
047852437
ABSTRACT:
Method and apparatus for performing eddy current flaw inspection on workpiece material such as steel bar stock. A drive mechanism propels a workpiece longitudinally along a workpiece path. An array of electromagnetic transmitter coils is disposed about the workpiece path. An electromagnetic source energizes the transmitter coils under control of multiplexing circuitry. The multiplexing circuitry and source actuate respective transmitter coils in a predetermined iterative sequence. The sequential actuation induces eddy currents in the workpiece at a succession of locations extending iteratively about the workpiece circumference. Circuitry coupled to multiple, differentially wound sensing coils detects variations in eddy current produced in the workpiece and utilizes these detected variations to produce flaw indicating signals.
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Abramczyk Richard F.
Aron, Jr. Steven J.
Harris Richard M.
Toth James M.
LTV Steel Company
Strecker Gerard R.
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