Degaussing system for bulk demagnetization of previously magnetized materials

摘要

The item to be demagnetized is placed in a chamber surrounded by electrical windings defining a pair of coils that are disposed in a mutually orthogonal configuration. Currents for the two coils are developed in a microprocessor-controlled inverter circuit and are applied through semiconductor switches in such a way that the resulting demagnetizing field is rotating and follows a predetermined amplitude variation in accordance with one or more profiles stored in the memory of the microprocessor.