Apparatus and method for compensating for variations in the lift

Details Apparatus and method for compensating for variations in the lift Apparatus and method for compensating for variations in the lift

1993-03-17

1994-12-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324240, 324241, 324242, 324262, G01N 2790, G01R 3312

Patent

active

053714610

ABSTRACT:
An improved eddy current probe array having means to compensate the entire array for varying different element liftoff, is described. An array consisting of a plurality of sense elements and means for compensating these sense elements is scanned across an inspection surface to produce respective scan responsive signals wherein the scan responsive signals of the sense elements are proportionately normalized or calibrated against the scan response of said compensating means during routine signal processing of the array signals in order to compensate for any lift off experienced by the sense elements. Array lift off compensation is attributable to sense element design cooperating with at least one lift off compensating sense element and a method of normalization/calibration performed during signal processing of the array signals.

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