Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1992-12-11
1996-01-09
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Magnetometers
324 96, 359280, 250225, G01R 33032, G01R 3302
Patent
active
054831610
ABSTRACT:
A general-purpose magnetic field sensor capable of sensitively measuring uniform magnetic fields includes a magneto-optic (Faraday-effect) sensor and a flux concentrator. Both the magneto-optic sensor and the flux concentrator have high magnetic permeability. The magneto-optic sensor is positioned in close proximity to the flux concentrator. The combination of the high-permeability magneto-optic material and the flux concentrator creates a magnetic circuit which efficiently concentrates the magnetic field into the magneto-optic sensor, and greatly enhances the measurement sensitivity. The preferred embodiment uses a pair of cylindrical flux concentrators in axial alignment. A sensing beam passes through a central axis hole in the cylindrical flux concentrators. The Faraday effect sensor is co-axially aligned with the holes in the cylindrical flux concentrators. The concentrators and Faraday effect sensor create a continuous flux concentrating magnetic circuit.
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Beahn Thomas J.
Day Gordon W.
Deeter Merritt N.
Manheimer Marc A.
Martin Rick
O'Shea Sandra L.
Patidar Jay M.
The United States of America as represented by the Secretary of
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