The design of high precision three axis fluxgate magnetometer

For the field of weak magnetic anomaly measurement, a high precision three axis fluxgate magnetometer MAG-XYZ is designed, which has a wide dynamic measurement range (0~ + 100000nT), high measurement accuracy (24-bit analog-to-digital converter) and 2K Hz sampling rate. The basic working principle of FGM3D / 100 sensor is described, and the composition of the three axis fluxgate magnetometer is introduced in detail. Aiming at the three-channel scale factor and zero deviation of the magnetometer acquisition unit, a multi-channel inconsistency correction of the magnetron acquisition system with least squares method is proposed. And compared with the GSM-19T proton magnetometer, the RMS error of the three axis fluxgate magnetometer is reduced from 1.506 to less than 0.157. It is shown that the method can effectively reduce the error, and improve the accuracy of the three-component magnetometer.