Modeling of inductive metal detector with swept frequency excitation

In this paper we present an investigation into using the swept frequency excitation for the inductive metal sensor. The frequency sweep excitation mode allows collecting eddy current data at a wide range of frequencies. The Nyquist polar plot of the sensor response depends on the geometrical and physical proprieties of the detected object. In this work an analytical solution of the response function for the homogenous sphere-shaped is presented. Than a finite element numerical simulation is performed. The swept frequency response is computed for different geometries and metal proprieties.