Giesecke & Devrient Gmbh

Giesecke+devrient Currency Technology Gmbh

David Sacquard

Jurgen Schutzmann

Dieter Stein

Shanchuan Su

Jürgen Schützmann

Joseph Lohner

Helmut Pradel

Walter Berngeher

The invention relates to a magnetic sensor which is designed for checking value documents, and to a method for calibrating the magnetic sensor. The magnetic sensor has different calibrating parameters for hard-magnetic and soft-magnetic magnetic regions, with which parameters the magnetic sensor can correct the detected magnetic signals of a value document, in order to compensate the magnetic sensor's measurement deviations in dependence on the type of the respectively detected magnetic region. For calibration, the magnetic sensor detects calibration measurement values of a calibration medium which is transported past the sensor. By means of the calibration measurement values the function of the magnetic sensor is tested. Where applicable, there is effected after the calibration an adjustment of the sensor using the calibration measurement values, upon which adjustment the calibrating parameters for hard-magnetic and/or soft-magnetic magnetic regions are determined from the detected calibration measurement values of the calibration medium.

Calibration of a magnetic sensor

A method for checking the soiling of the windows of a measuring apparatus for checking sheet material, includes having at least two sensor rows oriented transversally to the transport direction of the sheet material. Each of the sensor rows detects the light emanating from the sheet material in a certain spectral channel. For checking the soiling of the window the sensor rows detect the light at several detection times at which no sheet material is present in the capture area of the sensor rows. At least two of the spectral channels are combined with each other and the temporal variation of the intensities of the combined spectral channel is evaluated for the purpose of the soiling check. A small temporal variation of the intensity of the combined spectral channel is employed as an indicator for the presence of a soiling of the window.

Soiling check of the window of a measuring apparatus

The invention relates to a method for calibrating a sensor which is configured for checking value documents. The sensor senses measurement signals of a calibration medium which is transported past the sensor. From the sensed measurement signals there are determined reference data of the calibration medium and there is moreover determined a transport property of the calibration medium, e.g. the transport speed or the transport position of the calibration medium. From the transport property there is ascertained at least one correction value which is employed for correcting the sensed reference data of the calibration medium. After the calibration, the corrected reference data are compared with target data of the calibration medium. Optionally there is then effected an adjustment of the sensor using the corrected reference data.

Calibration of a sensor for processing value documents

The present invention relates to an apparatus for processing documents of value having a sensor device for checking the documents of value and a transport device by means of which the documents of value are transported along a transport direction past the sensor device. On a side opposing the sensor device there is disposed a guide element for passively guiding the document of value, which is moved as soon as several documents of value are transported at the same time past the sensor device. By the guide element according to the invention, documents of value can be reliably and accurately checked without great effort.

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Munich, Germany

David Sacquard