Digital Flux-gate Magnetometer

Abstract

In this paper the realisation of a flux-gate magnetometer based on a microprocessor is presented. The magnetometer operates as a closed-loop feedback system which is conrolled by microprocessor. The main part of the magnetometer is a sensor consisiting of ferromagnetic core, drive coil and sense coil. Because of the many advantages, the ring core sensor, instead of an open core, is used. The external magnetic field is measured by means of filtering the second harmonic amplitude of the sense coil induced voltage. The amplitude of the second harmonic is filtered by the band-pass so that the analog output signal is accessible. After the A/D conversion of this signal, additional digitalfiltering using Discrete Fourier Transform (DFT) is applied and an output signal in digital form is obtained.

Tomislav Kilić

Full Professor | Department of Electrical Measurements

Full professor at the at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with professional reserch focus on power quality, signal analysis in electrical power systems, and measurement of process variables, alongside a significant role in the academic and administrative life of the University of Split.

Stanko Milun

Full Professor

Faculty alumnus with a research focus in the development of measurement methods in high-voltage systems, signal analysis in electrical power systems, and the application of geoelectrical methods in energy infrastructure. Prof. Milun has been involved in numerous scientific projects, including those related to the optimization of grounding systems for high-voltage plants and the development of transient measurement methods. He has authored 38 scientific papers and over 150 professional studies.