ELECTRONICALLY SCANNED EDDY CURRENT FLAW INSPECTION

Electronically Scanned Eddy Current Flaw Inspection 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 a...

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Bibliographische Detailangaben
Hauptverfasser:	HARRIS, RICHARD M, TOTH, JAMES M, ARON, STEVEN J., JR, ABRAMCZYK, RICHARD F
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	Electronically Scanned Eddy Current Flaw Inspection 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. This 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 currents produced in the workpiece and utilizes these detected variations to produce flaw indicating signals.