Magnetic field strength measuring apparatus

Details Magnetic field strength measuring apparatus Magnetic field strength measuring apparatus

1979-08-22

1981-12-01

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

G01R 3304

Patent

active

043038867

ABSTRACT:
A rod of magnetic material which has a very small diameter compared to its length is used in combination with a drive and output winding wound around the circumference of the core rod to provide the sensor for measuring magnetic field strength. The rod is periodically and cyclically driven to saturation in each direction by a triangular waveform drive signal generator. A point on the saturation curve in each direction of saturation is picked and the relative time between these points for a no external field condition is determined. Any deviation from this no external field condition is sensed and applied to an integrator which provides both the output signal and a feedback signal which is used in combination with the signal generator to compensate for effects of the external field on the saturation points in the sensor. When the output signal is representative of the magnetic field, there is again no deviation in the time of occurrence of saturation in the rod from the no external field condition.

REFERENCES:
patent: 3983475 (1976-09-01), Watanabe et al.

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