Electricity: measuring and testing – Magnetic – With compensation for test variable
Patent
1993-04-14
1995-02-28
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With compensation for test variable
324233, 324236, 324202, 324656, 324712, G01N 2702, G01N 2790, G01R 3312, G01R 3500
Patent
active
053940849
ABSTRACT:
An eddy-current apparatus for measuring the conductivity of a conductive material and for reducing the influence of lift-off on conductivity measurements is provided. The apparatus includes a probe for inducing an eddy-current in a conductive material and a digital LCR meter for measuring the impedance of the probe when it is placed near the conductive material. A digital processor uses calibration impedance data obtained from a series of reference materials and an impedance measurement for a test material to produce a conductivity value independent of lift-off between the probe and the test material.
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Edmonds Warren S.
Strecker Gerard R.
The Boeing Company
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