A New MFL Testing Sensor Based on Localized Magnetization for Micro Crack Detection

摘要

Magnetic flux leakage (MFL) testing method has been used in defect detecting for decades. However, the capability of micro defect inspection mainly depends on the characterization of the sensor. This paper proposes a new MFL testing sensor based on localized magnetization for micro defect detection, which can detect micro crack with high sensitivity and accuracy. Preliminary introduction for the structures and working principles are presented. By the subsequent comparison of simulations and experiments between common MFL method and the new MFL sensor, we can conclude that this sensor possesses the capability of micro defect inspection. Finally, both the simulation results and the detection signals in the experiments demonstrated its feasibility and practicality.