Impedance Compensation Method for Giant Magneto-Impedance Magnetic Sensors to Null Out the Terrestrial Residual Magnetic Field

摘要

The invention is a method, described with the appropriate auxiliary electronic circuitry, for compensating the effect of the earth s magnetic field on Giant Magneto-Impedance magnetic sensors. The method as taught is an alternate way of cancelling out the effect of the very large residual earth s magnetic field using an impedance-tuning circuit (i.e. electrical compensation) rather than the usual magnetic type of compensation.