Apparatus for detecting a magnetic field having an excitation cu

Details Apparatus for detecting a magnetic field having an excitation cu Apparatus for detecting a magnetic field having an excitation cu

1989-02-02

1990-06-12

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, G01R 3304

Patent

active

049336371

ABSTRACT:
An apparatus for detecting a magnetic field includes a magnetic core, an excitation current source unit, a magnetic flux detecting unit, and a current control source unit. The excitation current source unit includes a first excitation winding disposed around the core, an amplifier having an output coupled to the first excitation winding, and a subtractor for applying to the amplifier a first difference between a voltage corresponding to a supplied excitation current and a voltage corresponding to a current passing through the first excitation winding. The magnetic flux detecting unit includes a second excitation winding disposed around the core, a waveform shaping circuit for shaping the waveform of a voltage induced in the second excitation winding, a pulse generating circuit for outputting pulses in synchronism with the shape waveform voltage, and a sample-and-hold circuit for sampling and holding the voltage corresponding to the supplied excitation current. The current control source unit includes a third excitation winding disposed around the core, a subtracter for outputting a second difference between an output of the sample-and-hold means in a predetermined output value, and a proportional-plus-integral circuit for outputting a control current command signal according to the second difference. The magnetic field detected in response to the control current command signal applied to the third excitation winding.

REFERENCES:
patent: 3040248 (1962-06-01), Geyger
patent: 3461382 (1969-08-01), Anderson
patent: 4303886 (1981-12-01), Rhodes

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