Measuring ultra-thin metallic coating properties using swept-frequency eddy-current technique

Thin metallic coatings are used in a wide range of industrial settings to protect or enhance the properties of the underlying material. We propose a new swept-frequency eddy-current-based technique to simultaneously measure the thickness and conductivity of metallic coatings, which thickness in the order of tens of micrometers. Variations in coil impedance with lift-off were discussed when the coi...