Magnetometer using a field controlled oscillator, the oscillator

Details Magnetometer using a field controlled oscillator, the oscillator Magnetometer using a field controlled oscillator, the oscillator

1977-09-26

1978-08-15

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Magnetometers

324 8, 324224, G01R 3302

Patent

active

041076079

ABSTRACT:
A magnetometer wherein inductance of a resonant circuit is made sensitive changes in magnetic field to vary an oscillator operating frequency. The magnetometer utilizes a ferromagnetic sensor element that is characterized by high permeability in weak magnetic fields when the element is maintained at predetermined elevated temperatures near the Curie point of the element material and also exhibits a hysteresis curve having a steep slope in the region of field strengths on the order of the earth's magnetic field. The preferred embodiment includes resistive heating of the element and use of substantially pure iron as the element material.

REFERENCES:
patent: 2407536 (1946-09-01), Chapman
patent: 2648823 (1953-08-01), Kock et al.
patent: 2671275 (1954-03-01), Burns, Jr.
patent: 3564401 (1971-02-01), Coon

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