Compensation of disturbances upon magnetic measurements on value documents

US9171411B2 · kind B2 · utility

Assignee

• GIESECKE & DEVRIENT GMBH · DE

Inventors

• Steffen Schmalz · Munich, DE
• Lothar Schütt · Dachau, DE
• Jurgen Schutzmann · Brackenheim, DE

Key dates

• Filing date: Dec 20, 2012
• Grant date: Oct 27, 2015
• Expiry date: Jun 6, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G06K7/087
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for the compensation of disturbances upon magnetic measurements on value documents, in which a sensor having several measuring tracks for generating measurement signals is employed, in which for each value document a specified number of data records is generated, the value document not being captured by at least one of the measuring tracks during the measurement, wherein from the measurement signal of the at least one measuring track there is ascertained a value for the quantity of a disturbance present in the region of the sensor during the measurement on the value document, and a compensation of the deviations of the measurement signals of the measuring tracks capturing the value document, which deviations are caused by the disturbance present during the measurement, is carried out by means of said ascertained value for the quantity of the disturbance.