Patent ID: 6363787
Filing Date: 2002-04-02
Classification: G01B,G01N

Abstract:
A method of determining the thickness of a coating adhered to a substrate, said method comprising:providing a transmitter and a receiver; positioning said transmitter at a first position adjacent said coating; positioning said receiver at a second position adjacent said coating, said first position being spaced apart from said second position; activating said transmitter to induce at least one surface wave burst into said coating, said surface wave burst comprising a plurality of surface waves, said surface wave propagating in said coating, and said surface waves having frequency spectrum associated therewith; generating electrical waveforms representative of said surface waves propagating in said coating using said receiver; and analyzing said surface waves to determine the frequency of surface waves within said frequency spectrum that propagate through said coating with minimal attenuation and correlating said frequency to a coating thickness.