Patent ID: 8476896
Filing Date: 2013-07-02
Classification: G01D,H03K

Abstract:
1. A method for determination of the position or position change of a measured object relative to a sensor, said method comprising: providing a sensor having a sensor coil acted upon with alternating current, wherein a change in permeability of a foil is produced by a magnet assigned to the measured object in a soft magnetic foil whose permeability changes under the influence of a magnetic field as a function of the field intensity of the magnetic field and which is arranged in an area of influence of the sensor and wherein the change in permeability of the foil is determined from a feedback on the sensor and from it the position or position change of measured object relative to the sensor, and wherein a magnetic field is generated by a compensation coil excited with direct current, by means of which the permeability of the foil or parts of the foil is influenced.