Non-contacting electromagnetic thickness gauge for sheet measure

Details Non-contacting electromagnetic thickness gauge for sheet measure Non-contacting electromagnetic thickness gauge for sheet measure

1977-07-27

1978-08-15

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

G01R 3312

Patent

active

041076060

ABSTRACT:
A caliper gauge for measuring the thickness of a sheet has a transmitter generating a magnetic field on one side of the sheet and a receiver detecting the amplitude of the magnetic field on the other side of the sheet. Both the transmitter and receiver are maintained at a constant distance from the sheet. The transmitter comprises an electrical wire wound a plurality of times about a cylindrically shaped body of a magnetically susceptible material. The receiver also comprises a cylindrically shaped body with an electrical wire wound a plurality of times about it. The transmitter is positioned such that the axis of the cylindrical body is substantially perpendicular to the sheet. The receiver is positioned such that the axis of the cylindrical body is substantially aligned with the axis of the transmitter.

REFERENCES:
patent: 1946924 (1934-02-01), Allen et al.
patent: 2563254 (1951-08-01), Lewis
patent: 3528002 (1970-09-01), Dunlavey
patent: 3696290 (1972-10-01), Dreckmann et al.

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