Design and Optimization of Miniaturized Single Frequency Point Inductive Magnetic Sensor

Nowadays, in the field of magnetic detection, the combination of magnetic sensors and multirotor unmanned aerial vehicle (UAV) is more and more widely used. Multirotor UAV has certain requirements for the volume and sensitivity of the sensor. For the detection of weak magnetic field signals at single frequency point, the sensitivity, accuracy, and volume of the inductive magnetic sensors still have a large room to improve. Based on theoretical analysis and simulation, this paper added a cylindrical high permeability sheet on both sides of the magnetic core in this paper to improve the sensitivity of the sensor. The advantage of this method is that it will not increase the volume and weight of the sensor while greatly improving the sensitivity; Meanwhile, through the analysis of the crosstalk between the cores of the triaxial inductive magnetic sensor, an applicable spacing is obtained among the triaxial coils, so that the crosstalk voltage is under the resolution of the induction coil, the crosstalk effect can be ignored. The initial sensitivity of the induction coil designed in this paper can reach 0.20mV/nT@380Hz. The maximum equivalent magnetic crosstalk is about 6.45pT, which is suitable for the application of single frequency array magnetic measurement.