On-line web internal resistivity measuring apparatus

Details On-line web internal resistivity measuring apparatus On-line web internal resistivity measuring apparatus

1988-04-07

1989-08-29

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 65P, 324558, G01R 2702, G01R 2726

Patent

active

048620653

ABSTRACT:
A web roller is provided with at least two electrodes that are positioned parallel to each other on the roller surface end parallel to the longitudinal axis of the roller. Slip rings provide individual electrical connections to the electrodes. The electrodes are spaced apart a distance which permits both electrodes to be in contact with a web of sheet material of the type having a conductive center sandwiched between layers of insulating sheet. A position detector, positioned to detect the rotation of the roller, provides a pulse signal of a known magnitude to one of the electrodes, through a slip ring, when the electrodes are in contact with the web of sheet material. A sensor coupled to the other electrode, through a slip ring, receives the pulse signal after it has passed through the sheet material located between the two electrodes. The magnitude of the received pulse is a function of the resistivity of the sheet material.

REFERENCES:
patent: 2870405 (1959-01-01), Wright
patent: 3916789 (1975-11-01), Watts
patent: 4546310 (1985-10-01), Chatanier
patent: 4674325 (1987-06-01), Kiyobe

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