Calibration of eddy current profilometry
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United States of America Patent
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Jul 17, 1990
Grant Date -
N/A
app pub date -
Jun 6, 1988
filing date -
Jun 6, 1988
priority date (Note) -
Expired
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Abstract
Calibration of an eddy current probe (24) and associated data acquisition and analysis system (42, 48, 52, 54, 66) is accomplished using a step tube sample (68) having a nominal diameter portion (74) substantially equivalent to a nominal field tube (22). Two readings of eddy current test units are obtained from the step tube sample, and the diameter of the probe is used as a boundary condition on the non-linear response of the probe to variations in tube radius. A calibration curve is generated for use in converting field tube eddy current measurements to field tube radius or profile.
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