Proximity detector for ferromagnetic targets based on a sensor comprised of magnetoresistance

摘要

Detector (40) comprises a magnetic sensor (42) made up of two or more magnetoresistances, and a permanent magnet (43) producing a local magnetic field (HO), which is applied to the magnetoresistances. The detector (40) also comprises means for detection of the exceeding of a threshold value for the disequilibrium between two magnetoresistances.