MAGNETIC NOISE MEASUREMENT FOR VACQUIER TYPE FLUXGATE SENSOR WITH DOUBLE EXCITATION

摘要

This paper presents a Vacquier type fluxgate sensor noise measurement and the constructive principle of our sensor. The sensor contains two cores made by amorphous wires and permits two kinds of excitation modes: excitation by coils and "direct" excitation (excitation current flowing through the cores). In both excitation modes we used the same frequency. We obtained a sensor's noise reduction from 500 pT (pp) to 30 pT (pp) in 0 - 10 Hz frequency range.