Abstract
Ferromagnetic materials present unique difficulties for eddy currents inspection, due to the signals produced by localized variations of permeability. The latter are mainly due to residual magnetization and residual stresses. Numerical simulations are very useful in the design and optimization of successful inspection techniques, but it is not clear that are up to the task in such a complex situation. Many of the available tools are based on a linearity assumption, and do not have an easy way of including position dependent properties, or residual magnetization. In this work we present some preliminary measurements scanning a single coil over a steel plate with a notch, for different applied and residual magnetic fields. The goal is to develop a benchmark that is useful to assess how much a realistic residual magnetization will affect simple linear predictions, and explore more complex numerical approaches to understand their capabilities and limitations. Preliminary numerical simulations will also be presented.
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