Modelling and Validating Ferrite-core Probes for GMR-eddy Current Testing in Metallic Plates

Non Destructive Testing techniques are more and more exploited in order to quickly and cheaply recognize flaws into the inspected materials. Within this framework, modelling is a powerful tool for inspection improvements. It helps probe-coil designers to optimize sensors for each examination requirement, providing better understanding of the involved physics, supporting operator training and increasing defect analysis reliability. The effect of the ferrite core is analyzed in order to optimize the design of probe-coils and study various configurations of inspection. Particularly, Finite Element based analyzes will be carried out into this path. Direct problem will be assessed, and direct model will be formulated, dependent by different parameters, e.g., coil shape, working frequencies and so forth. The model will be subsequently validated by in-lab experimentations.