G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 33/04 (2006.01) E21B 47/024 (2006.01)
Patent
CA 2733431
A ring-shaped first ring-shaped magnetic core, a first excitation coil wound on the first ring-shaped magnetic core, two detection coils wound on the first ring-shaped magnetic core in such a manner that respective input axes of the detection coils are orthogonal to each other, two signal detection/feedback units that detect outputs of the detection coils and feed output signals back to the detection coils, and a first excitation circuit that supplies an excitation current to the first excitation coil are provided, a second ring-shaped magnetic core, a compensation coil wound on the second ring- shaped magnetic core, and a compensation signal generation unit that generates, from an output of a detection coil, a compensation current to be applied to the compensation coil, are further provided, and the second ring- shaped magnetic core and the compensation coil are disposed in positions and directions so that a compensation magnetic field created by the compensation coil cancels interference between magnetic fields generated by two detection coils wound on the first ring-shaped magnetic core.
Japan Aviation Electronics Industry Limited
Kirby Eades Gale Baker
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