摘要:
A method and apparatus for nulling the magnetic field within a specified volume in the presence of an external ambient field by generating compensating magnetic fields at a number of locations 13 and 15 around the volume, sensing the field at 20 in the volume and controlling the value of the compensating fields in a closed loop system to null the field within the volume.
摘要:
A method and apparatus for nulling the magnetic field within a specified volume in the presence of an external ambient field by generating compensating magnetic fields at a number of locations 13 and 15 around the volume, sensing the field at 20 in the volume and controlling the value of the compensating fields in a closed loop system to null the field within the volume.