Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1997-04-01
2000-07-04
Strecker, Gerard
Electricity: measuring and testing
Magnetic
Magnetometers
33361, 324247, 324258, G01R 3302, G01R 3304, G01C 1728
Patent
active
06084406&
ABSTRACT:
A magnetic field sensor element comprises an elongated core of high-magnetic permeability material having a coil of electrically-conductive wire wound around and along a central axis of the core. The sensor, due to inductance of the core which changes with application of a local magnetic field, exhibits a characteristic of delaying an electrical input as a function of the strength of a magnetic field in the direction of the axis of the core, and the delay is measured as a function of the strength of the magnetic field. Appropriate circuitry provides at least one step-function voltage input to the coil such that the resulting delay in current charge-up into the coil creates a voltage across the coil which decays to a known reference value. The time delay for the voltage decaying to the reference value varies as a monotonic function with the strength of the applied magnetic field to be measured.
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patent: 5757184 (1998-05-01), Kurihara
Hsu George
James John J.
Boys Donald R.
Precision Navigation, Inc.
Strecker Gerard
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