The invention relates to a method for determining the thickness of a
coating on a composite material by applying induced currents wherein the
composite material together with its coating is placed on a conducting
material, in which circulating electric currents induced by an
alternating magnetic field are created, an indirect measurement being
subsequently carried out based on the measurement of the lift-off effect
that the coating, together with the composite material, offers in induced
currents against the mentioned conducting material.