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Miniature magnetic sensor with a high sensitivity and wide bandwidth

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1 Author(s)
P. A. Robertson ; Dept. of Eng., Cambridge Univ., UK

A miniature fluxgate magnetic sensor has been demonstrated with microtesla resolution, a dynamic range of four orders of magnitude and a frequency response extending from DC to 1 MHz. The sensor comprises a millimetre long solenoid winding with a thin amorphous metal core, excited by an RF source. The system is illustrated reading magnetic card data across a 0.25 mm air gap and non-contact monitoring of milliampere currents flowing in PCB tracks

Published in:

Electronics Letters  (Volume:33 ,  Issue: 5 )