Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1979-08-22
1981-11-10
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
G01R 3304
Patent
active
043000959
ABSTRACT:
A magnetic field sensing device comprising a magnetic rod which is direction sensitive relative to the field being measured. The rod is of such design that the magnitude or the strength of the field being sensed, significantly affects the magnitude of the excitation field required to produce a saturation of the magnetic core. An external field in the longitude direction of the core will require that the excitation field magnitude required to produce a given level of saturation will be different in one direction than in the other, by magnitude equal to twice the component of the external field acting upon the core. The excitation field is produced by current in the winding with the current changing at a given rate so that the induced or output voltage is greater than a specified value; as long as the core permeability is greater than a given specified value. Whenever the induced voltage drops below a given value, this situation is detected and the excitation field is reversed to give a constant rate of change of excitation in the opposite direction. A constant rate varying field is produced by an analog integrator used as a triangular voltage wave generator that is followed by a voltage-to-current converter with the current run through an excitational winding on a core. An external magnetic field acting on the core will cause the triangular voltage wave to be offset so that it is unsymmetrical, about zero. This average offset is detected and the value integrated in a second integrator. The outputs of the analog and second integrators are summed and the sum value is used to drive the voltage-to-current converter. The voltage value on the second integrator will be proportional to the component of the external magnetic field that is in the direction of the sensor.
REFERENCES:
patent: 3460029 (1969-08-01), Guillemin
Ling, "Fluxgate Magnetometer for Space Application" Mar. 1964, J. Spacecraft, vol. 1, No. 2, pp. 175-180.
Bachand Richard A.
Hamann H. Fredrick
Lutz Bruce C.
Rockwell International Corporation
Snow Walter E.
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