Magnetometer operated at a self-resonant frequency by a sense wi

Details Magnetometer operated at a self-resonant frequency by a sense wi Magnetometer operated at a self-resonant frequency by a sense wi

1983-09-26

1986-12-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

33361, G01R 3304

Patent

active

046267824

ABSTRACT:
A self-resonant magnetometer using the inductance and interwinding capacitance of a sense winding to establish the frequency of operation. A sense winding signal is amplified to provide a driver current for a driver winding. The driver winding current with the addition of a dc offset current causes the mu (permeability) of a ferrite core to vary in a non-linear region of its B/H curve. The change in the mu of the ferrite core produces a change in flux in the magnetic core if an external magnetic field is present. This change in flux induces a signal in the sense winding.

REFERENCES:
patent: 2480265 (1949-08-01), Rubenstein
patent: 2565799 (1951-08-01), Brattain
patent: 2861242 (1958-11-01), Leavitt
patent: 3001129 (1961-09-01), Knowles
patent: 3040247 (1962-06-01), Van Allen
patent: 3286169 (1966-11-01), Slonczewski
patent: 3427534 (1969-02-01), Maxwell
patent: 3626280 (1971-12-01), Van Englehoven et al.
patent: 4447776 (1984-05-01), Brown

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