Coating thickness measurement method in which one or two optical, ultrasonic or mechanical sensors are used to measure the distance to a substrate surface and the surface of a coating applied to it

摘要

Method for measuring the thickness of coating applied to a surface in which a first optical, ultrasonic or mechanical sensor (5) is used to measure the distance from this first sensor to the surface (2), while a second optical, ultrasonic or mechanical sensor (6) is used to measure the distance between itself and the coating (3) surface. The coating thickness is determined as the distance between the two distance values. Independent claims are also included for the following:- (A) two further methods for determining a coating thickness and; (B) a method for determining the height profile of a coating applied to a surface.