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MAGNETIC FIELD COMPENSATION
SYSTEMS Manufacturing and Marketing Licensee ETS-Lindgren |
MV-EMFC Systems Active-Feedback Magnetic Shielding for Electron Microscopy and MRI |
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Performance: Linear Research Associates' unique EMFC-series active-feedback magnetic shielding technology (U.S. Pattent 5,465,012) provides instantaneous, high-level protection at any frequency or combination of frequencies within a wide passband. No other commercially-available compensation system attains this uniformly high level of magnetic field suppression at all frequencies which can interfere with EM operation. Superior perfomance and reliability are guaranteed!
1) Field Sensors/Preamplifiers:
2) Signal Processor/System Controller:
3) Driven Coils:
Alternating current magnetic fields radiating from nearby a.c. power wiring, ground
loops, transformers and related sources are detected via pickup sensors mounted on the
EM column. These proprietary (U.S. Patent 5,469058) devices are physically small yet
highly responsive to interfering magnetic fields. Column-mounted a.c. sensors and the
co-located preamplifier module assure maximum transverse a.c. field attenuation at the
beam location. Extended-range EMFC-QDC systems substitute a calibrated fluxgate probe
to suppress lower-frequency magnetic field fluctuations caused by trucks, subway
trains, and elevators or nearby analytical equipment such as mass spectrometers or
MRI scanners.
4) Performance: Linear Research Associates' unique EMFC-series active -feedback magnetic shielding technology provides instantaneous, high-level protection at any frequency or combination of frequencies within a wide passband. No other commercially-available compensation system attains this uniformly high level of magnetic field suppression at all frequencies which can interfere with EM operation. {Char: ambient field reduction with extended-range EMFC-QDC-3 system.]
FOR AC INTERFERENCE |
FOR AC AND LOW FREQUENCY INTERFERENCE |
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