Sensor unit for detecting and altering magnetic field

摘要

The sensor unit contains a magnetic field generating system (21,22), and a magnetic field alteration inducing system (2). The magnetic field generated by the magnetic field generating system is altered in such a manner, that the magnetic field alteration inducing system is arranged with a determinable distance compared to the magnetic field generating system. Several magnetic field detector elements are provided. The detector elements are so arranged, that the middle of the gap between the detector elements, do not coincide with the position of the centre of the magnetic field generation system.