Measurement of coating thicknesses is known from, for example, the paint measurement for coating thickness at cars. In fact, these measurements are used much more widely in industrial applications. This is where the thickness of the surface finish is measured, such as galvanisation, zinc coating etc, or also lacquers.
Fundamentally there are two measuring principles for determining coating thickness:
Typ F: Non-magnetic coatings on magnetic metals, such as iron or steel (magnetic induction principle). Here are some sample material combinations:
aluminium, chrome, copper, rubber, lacquer on
steel, iron, alloys, magnetic s tainless steel
Typ N: Insulating coatings on non-magnetic metals, such as aluminium (eddy current principle). Here are some sample material combinations: