Dual purpose electromagnetic thickness gauge

Details Dual purpose electromagnetic thickness gauge Dual purpose electromagnetic thickness gauge

1975-02-14

1976-10-12

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3312

Patent

active

039861058

ABSTRACT:
A probe for electromagnetic measurement of the thickness of a layer of material applied to a base of dissimilar material consists of an elongated ferro-magnetic core surrounded by an electrical coil several diameters larger than the diameter of the core and having one end placed close to the plane of the pole face of the core so that measurements involving magnetic materials can be undertaken by utilizing variations in magnetic flux path at low energization frequencies while measurements involving electrically conductive materials are undertaken by utilizing eddy currents induced at high energization frequencies.

REFERENCES:
patent: 2920269 (1960-01-01), Hanysz et al.
patent: 3761804 (1973-09-01), Steingroever
Bennett et al., A Review of Methods for Coating-Thickness Determ., Jour. of Scien. Inst., vol. 26, June, 1949, pp. 209-215.
Dick, P. Measuring Thickness of Paramagnetic Coating; Electronics; Feb., 1961, pp. 48-50.
Dodd et al., Thickness Measurements Using E.C. Techniques Material Eval.; May, 1973, pp. 73-84.

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