Faint magnetic field measurement based on fluxgate sensor

摘要

This paper presents a fluxgate sensor based on the weak magnetic field strength measurement method. According to the principle of fluate sensor, a detection system based on magnetic nanoparticle imaging, magnetic fluxgate sensor, preamplifier circuit and phase sensitive detector is designed. Using CD4060 chip to generate carrier signal and detection signal; using the preamplifier circuit to amplify the carrier signal and the detection signal; the use of fluxgate sensor will be measured by the carrier signal carrier signal Transmitted to the phase-sensitive detection circuit for processing after separation of the measured signal for measurement. Finally, the feasibility of this method is demonstrated by simulation, and the measured magnetic field intensity range is weaker and more accurate.