Active magnetic field compensation, e.g. for use in measurement of biomagnetic signals, whereby both measurement and reference sensors are used and the reference signals used to determine a compensation field

摘要

Sensor system for compensation of magnetic fields has at least two magnetic sensors, one or more measurement sensors for the wanted signal and one or more reference sensors for the magnetic field compensation. The magnetic field strength at a measurement location is estimated using a quantity of reference field strengths. Preferably neural networks are used which employ a back-propagation-of-error learning method.