Apparatus and method for detecting weak magnetic fields having a

Details Apparatus and method for detecting weak magnetic fields having a Apparatus and method for detecting weak magnetic fields having a

1992-10-27

1994-08-02

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

G01R 3304, G01R 3302

Patent

active

053349350

ABSTRACT:
Apparatus and method for detecting the presence of extraneous magnetic fields having a predetermined weak magnitude include a transformer having an excitation winding, an output winding, and a saturable core which will saturate in a magnetic field of a predetermined saturation magnitude. The core is made of amorphous metal alloy and is shaped to cancel the electromagnetic effects of magnetic fields having flux lines which are substantially parallel with respect to the transformer. An excitation circuit is connected to the excitation winding for generating a magnetic field having an excitation magnitude of lesser magnitude than the saturation magnitude of the core. The excitation magnitude and the weak magnitude of the extraneous magnetic fields combine to create a magnetic field of greater magnitude than the saturation magnitude of the core. A detector circuit is connected to the output winding for detecting and indicating saturation of the core.

REFERENCES:
patent: 3458802 (1969-07-01), Koerner
patent: 4739263 (1988-04-01), Mohri et al.
"Review on Recent Advances in the Field of Amorphous-Metal Sensors and Transducers," IEEE Transactions on Magnetics, vol. Mag-20, No. 5 (Sep. 1984).
"Soft Magnetic Materials," Proceedings of the IEEE, vol. 78, No. 6 (Jun. 1990).
"Amorphous Magnetic Materials," Encyclopedia of Chemical Technology with Interscience, vol. 2, 3rd Ed. (Wiley Interscience 1980).

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