The paper describes a low-power consuming portable DC field magnetometer which employs a relatively new sensor. Saving of power is due on one hand to the selection of a thin ferromagnetic amorphous material for the sensor core. On the other hand, the fact that the sensor core excitation current consists of a square wave-form carrier whose amplitude modulation by another square wave permits an on- and off-operation, leads to economic utilization of power in the electronic circuitry. The magnetometer is operated by six cells type AA 1.5V connected to supply ± 4.SV. The power consumption is 60 mW, from this two thirds are supplied to the excitation coils of the sensor. The sensitivity of the magnetometer is 1nTs for a 0.2 Hz bandwidth. It seems that the sensitivity of the present magnetometer can be further increased to 0.1nTs with 1 Hz bandwidth by using sensors with relatively thin core of properly heat treated MuMetal or MolyPermalloy.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering