Single-winding magnetometer with oscillator duty cycle measureme

Details Single-winding magnetometer with oscillator duty cycle measureme Single-winding magnetometer with oscillator duty cycle measureme

1987-08-25

1989-08-22

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

33361, 331 65, G01R 3304, G01C 1728

Patent

active

048599441

ABSTRACT:
A magnetometer having only a single coil winding for sensing the magnetic field along a single axis. Functionally, the invention comprises an oscillator, and means for measuring the duty cycle thereof. The oscillator uses a saturating inductor which also serves as the magnetic-field-sensing element. The inductor is driven with a position voltage and when the current through the inductor exceeds a value which indicates that the core is saturated, the driving voltage switches to an equal-magnitude negative value. This negative drive is maintained until the current again indicates the core to be saturated, at which point the driving voltages switches back to the positive value. With no externally applied field, the inductor current averages to a zero value and the duty cycle of the driving voltage is fifty percent. An externally applied field helps the core saturate in one direction and hinders it in the other, resulting in a change in average inductor current and drive duty cycle.

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