Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1992-12-30
1995-11-21
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
G01R 3302
Patent
active
054690587
ABSTRACT:
The present invention features an active sensor for detecting a magnetic field. The sensor includes a pickup coil wound on a semi-flexible bobbin, which in turn is mounted on a suitable core assembly. Optionally, the core/coil assembly can then be mounted on a flexible substrate. Thin strips of either standard or amorphous crystalline high-permeability alloy are laminated to form the core. Once the coil has been assembled with the core laminations, output leads from the coil are connected to conductors of a miniature coaxial cable, the sheath of which is grounded to the core laminations. An operational amplifier is connected to the coil assembly. The operational amplifier has a positive feedback path to substantially cancel the combined dissipative loss of resistance and core eddy currents of the coil assembly. The operational amplifier also has a negative feedback path to set the maximum gain of the active sensor.
REFERENCES:
patent: 3546580 (1970-12-01), Williams
patent: 3872382 (1975-03-01), Bertram et al.
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