Electrical transmission or interconnection systems – Anti-induction or coupling to other systems – Magnetic or electrostatic field control
Patent
1992-12-30
1995-11-07
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Anti-induction or coupling to other systems
Magnetic or electrostatic field control
361139, H04B 1500
Patent
active
054650127
ABSTRACT:
The present invention features a magnetic field compensation system for suppressing alternating or time-varying magnetic fields in a large volume of space. A magnetic sensor detects within a predetermined range of frequencies and generates a signal. A coil or pair of Helmholtz drive coils is positioned into a volume containing the magnetic sensor. A preamplifier is connected to the magnetic sensor for amplifying the signal. A signal processor is connected to the preamplifier for receiving the signal and for providing phase correction and gain. The signal processor has both an averaging and an absolute peak detector for determining magnetic field average and peak excursions. A power amplifier is connected to the coil or pair of Helmholtz drive coils and to the signal processor for receiving and amplifying the processed signal and for applying it to the coil or pair of Helmholtz drive coils.
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patent: 4932951 (1990-06-01), Liboff et al.
patent: 4963789 (1990-10-01), Buhler
Magnetic Cancelling System, Spice Consulting, Bedford, England Jun. 3, 1991.
Ganjoo Peter
Shoop Jr. William M.
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