A measurement system based on magnetic sensors for nondestructive testing

The paper deals with a measurement system based on a low-rest eddy current probe for nondestructive testing (NDT) on conducting materials aimed at rec onstructing the shape and position of thin cracks. The magnetic probe is ch aracterized, highlighting good repeatability, linearity, and overall accura cy. A number of different measurement approaches are investigated, in order to choose the more appropriate for NDT applications. A numerical method wa s then illustrated; it proves to be able to reconstruct cracks also startin g from noisy measurement data.