Typical SEM Installation

The Spicer Consulting Magnetic Field Cancelling Systems comprise a Magnetic Field Control Unit, AC or DC Magnetic Field Sensors and three multicore cables which are installed in the room where the field is to be cancelled.

The Control Unit power amplifiers drive currents through the cables to create a field which is the opposite sign to the changes in the ambient field. The magnetic field sensors measure the resulting field and real time negative feedback reduces the ambient field by the loop gain of the system.

The systems are dynamic, automatically responding to field changes within 100 µs.