Calibration of a magnetic sensor
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United States of America Patent
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Mar 6, 2018
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app pub date -
Jul 4, 2013
filing date -
Jul 6, 2012
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Abstract
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.
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