Magnetic testing method and apparatus having provision for elimi

Details Magnetic testing method and apparatus having provision for elimi Magnetic testing method and apparatus having provision for elimi

1978-07-10

1980-07-29

Rolinec, Rudolph V.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324237, 324238, G01R 3300

Patent

active

042153107

ABSTRACT:
A method and apparatus for electromagnetic testing of magnetic and/or electrically conductive materials. The apparatus includes the usual test probe which carries excitation and pickup coils and is placed against a test piece of magnetic and/or electrically conductive material. The invention eliminates inaccuracies in the test caused by variable distances or gaps between the probe and test piece surface. Properties of the test pieces are determined by applying a controlled alternating drive current to the excitation coil so as to produce a predetermined a-c voltage in the pickup coil and measuring the drive current applied to the excitation coil when the time-integral of the voltage induced in the a-c pickup coil corresponds to zero magnetic flux in the gaps.

REFERENCES:
patent: 3422346 (1969-01-01), Hammer
C. V. Dodd, "A Portable Phase Sensitive Eddy Current Instrument," Material Evaluation, Mar. 1968, pp. 33-36.

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