Turbine blade thermal protection coating thickness nondestructive measurement method and system

The invention relates to the technical field of nondestructive measurement of the thickness of a thermal barrier coating of a turbine blade of a gas turbine, in particular to a nondestructive measurement method and system for the thickness of a thermal protective coating of a turbine blade. According to the invention, high-precision point clouds before and after turbine blade surface processing can be collected, the surface coating thickness variation is calculated through point cloud processing and a point cloud registration algorithm, and the method has the characteristics of accurate measurement, fast measurement speed and high measurement resolution; the method can be suitable for workpieces with various surface forms, the measurement result is not influenced by the internal organization structure of the coating and the material property, the method is more universal, and the application scene is wide; the method is not only suitable for nondestructive measurement of coating preparation increment thicknes