E-Pulse Diagnostics of Curved Coated Conductors With Varying Thickness and Curvature

The use of the E-pulse technique to diagnose changes in the material parameters of a coating on a conducting surface is examined. To include the effects of varying curvature and coating thickness, the canonical problem of an elliptical cylinder coated with a circular dielectric layer is considered. It is shown that E pulses created using the natural resonance frequencies of a planar coated conductor may be used in the diagnosis, as long as the thickness of the planar coating is taken to be equal to the thickness of the coating on the elliptical cylinder at the specular point. The performance of the E-pulse technique improves as the size of the cylinder is increased, since the curvature of the surface approaches that of a plane