Eddy Current Sensor With Multiple Spatial Degrees of Freedom for Concentrating Magnetic Fields

The development of the Koch curve fractal geometry provides valuable ideas for the structural design of sensor. Conventional eddy current sensor (CECS) cannot effectively concentrate electromagnetic fields' energy and have low detection sensitivity. The eddy current sensor (ECS) based on the Koch curve fractal geometry can change the distribution of electromagnetic fields in space. Therefore, based on the Koch curve fractal geometry, a novel ECS with multiple spatial degrees of freedom (SDOFs), including torsion structure of the xy plane and inclination angle of the yz plane, for concentrating magnetic fields (MSECS) is developed in this article. The proposed multiple SDOFs are analyzed and optimized by finite element analysis. An energy spectrum function is proposed to describe the distribution of eddy current. The simulation results show that MSECS can concentrate electromagnetic fields and improve energy transfer efficiency. Defect detection experiments are conducted on prefabricated defective steel plates, which show that MSECS has a better performance of detection. surface studied detection was tion to was coils

Automated summary

The development of the Koch curve fractal geometry provides valuable ideas for the structural design of sensors. Conventional eddy current sensors have limitations in concentrating electromagnetic energy and detection sensitivity. This article proposes a novel eddy current sensor based on the Koch curve fractal geometry, which can change the distribution of electromagnetic fields in space. The results of simulation and defect detection experiments demonstrate that the proposed sensor can effectively concentrate electromagnetic fields and improve detection performance.