Method and sensor arrangement for determining the position and/or change of position of a measured object relative to a sensor

A sensor arrangement for determination of the position or position change of a measured object relative to a sensor, said sensor arrangement comprising:

• a magnet assigned to the measured object;
• and
• a sensor having a sensor coil acted upon with alternating current,
• wherein in an area of influence of the sensor, a foil of soft magnetic material is arranged, in which the permeability of the foil varies under the influence of a magnetic field as a function of the field intensity of the magnetic field and wherein an evaluation circuit is provided by means of which the change in permeability of the foil is determined from its feedback on the sensor and the conclusion concerning the position or position change of the measured object relative to the sensor is drawn, and
• wherein a compensation coil excited with direct current is provided with which the permeability of the foil or part of the foil is influenced.

A sensor arrangement for determination of the position or position change of a measured object relative to a sensor, said sensor arrangement comprising:

• a magnet assigned to the measured object;
• and
• a sensor having a sensor coil acted upon with alternating current,
• wherein a foil made of soft magnetic material is arranged in an area of influence of the sensor, in which the permeability of the foil varies under the influence of a magnetic field as a function of the field intensity of the magnetic field and in which movement of the measured object occurs essentially in directions parallel to an expansion direction of foil and wherein the change in permeability of foil is determined from the feedback on the sensor and from it the position or position change of the measured object relative to the sensor, and
• wherein a region of higher permeability is formed in the foil, a region of reduced permeability and a transitional region between the two regions, and wherein depending on the distance between the sensor and measured object, the transitional region is displaced along the foil.