大型铁磁性物体近场磁异常场数值仿真

Magnetic anomaly detection is a widely used approach to detect ferromagnetic objects, which is mainly based on the spatial distribution of magnetic anomaly field. The spatial magnetic field model of rectangular ferromagnetic object is derived. The spatial distribution of the magnetic anomaly field in the near-field of the large-scale ferromagnetic target is analyzed using ANSYS Maxwell. For different geomagnetic field direction conditions, the laws of magnitude distribution and vector distribution of the magnetic induction in the near-field are obtained, which reveals a universal symmetry and regularity in magnetic induction modulus field and vector field. The shrinkage ratio experiment is conducted and the magnitude distribution and vector distribution of the magnetic induction in the near-field of model are measured in similar conditions, which validates the consistency and correctness of the spatial distribution law of magnetic anomaly field.