Electronically scanned eddy current flaw inspection
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United States of America Patent
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-
Nov 15, 1988
Grant Date -
N/A
app pub date -
Jan 29, 1987
filing date -
Jan 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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