Active Compensation System Technology

Stefan-Mayer FAST MR-3 three-axis magnetic field canceling system for electron microscopes (SEMs and TEMs), electron/ion beam and laser experiments, nanotechnology, bio-magnetic investigations, etc. High reliability thorough rugged analog design. No tedious programming, no crashes, no digital-to-analog noise pulses in the cancellation coils that could compromise optimal imaging performance for EMI sensitive ion-beam and laser research tools.

The magnetic field at the tool column is measured with a low-noise 3-axis fluxgate sensor. The controller unit contains the sensor, control electronics and low impedance current pumps for direct connections to the dual orthogonal Bx, By and Bz compensation coils. Quasi-static DC magnetic field changes caused by trams, subway, trucks, and elevators are effectively reduced as well as AC magnetic fields from power lines and other higher frequency EMI sources.