A magnetic field sensor has two flux concentrators which serve to strengthen a magnetic field to be measured and which are separated by an air gap. Two Hall elements are arranged outside the air gap in such a way that at least a part of the field lines which lead from the first to the second flux concentrator...http://www.google.es/patents/US6184679?utm_source=gb-gplus-sharePatente US6184679 - Magnetic field sensor comprising two hall elements
Magnetic field sensor comprising two hall elements