Contacting thickness gauge for moving sheet material

Details Contacting thickness gauge for moving sheet material Contacting thickness gauge for moving sheet material

1987-07-15

1988-12-13

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324236, G01B 710

Patent

active

047913673

ABSTRACT:
A contacting thickness gauge for measuring the caliper of paper includes a U-shaped pole piece on one side of the paper with a return path being provided by a simple ferrite slab on the other side where the magnetic reluctance of the gaps provides a measure of the caliper. The pole piece has one leg of relatively small diameter contacting the paper; the other larger leg of the U-shaped pole piece being spaced from the paper by either jewel or air bearings to minimize the contact with the sensitive surface of the moving sheet material. The area ratio provides for an insensitivity of the gap of the large leg. In addition, the stray self inductance of the windings is eliminated due to the use only of a mutual inductance measurement to determine the final resonant frequency which is a measurement of the caliper.

REFERENCES:
patent: 2563254 (1948-05-01), Lewis
patent: 3258686 (1966-06-01), Selgin
patent: 3828248 (1974-08-01), Wennerberg
patent: 4005359 (1977-01-01), Smoot
patent: 4107606 (1978-08-01), Typpo et al.

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