Method of calibrating magnetic thickness gauges

Details Method of calibrating magnetic thickness gauges Method of calibrating magnetic thickness gauges

1976-01-27

1979-07-03

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Calibration

324230, G01R 3500

Patent

active

041602080

ABSTRACT:
The calibration of magnetic gauges used for measuring the thickness of a layer applied to a base can be accomplished by the use of a test sheet composed of an essentially uncoated material which exerts a lesser influence on the gauge for a given thickness than the material comprising the base upon which the measured layer is applied. An uncoated test sheet of a certain thickness, when brought into contact with the pole piece of a thickness gauge, will produce a reading equivalent to that produced when the gauge measures a layer of predetermined thickness applied to the usual base material. For calibrating a gauge used to measure the thickness of a non-magnetic layer on a ferromagnetic base, the test sheet may be a material of less magnetic conductivity, permeability and/or saturation than that of the usual base material. A non-limitative example of a material suitable for use as a test sheet is pure nickel. Where the gauge is to be used to measure the thickness of non-conductive layers on a conductive base, the test sheet may comprise an uncoated sheet of a material of less conductivity than that of the base material.

REFERENCES:
patent: 2749505 (1956-06-01), McNary
patent: 3582772 (1971-06-01), Hammer
patent: 3815016 (1974-06-01), Nix et al.

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