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High-Frequency Eddy Current System for Analyzing Wet Conductive Coatings during Processing

Due to the growing usage of carbon fiber composites in the aircraft industry, the necessity of their protection against damage caused by a lightning strike increases. Instead of networks of copper wires located on the surface of these materials, wet conductive coatings are now being used as an alternative. The conductivity as well as the thickness of wet conductive layers has to be controlled during the application, which becomes possible by knowing their drying behaviors during processing. A nondestructive Eddy Current method is indicated for use due to the following advantages: works quickly, does not require direct contact with a deposited layer and responds to slightest changes in the electro-physical properties of the coatings. The system allows automatic data acquisition over the drying time of the wet coatings, so their drying behaviors can be visualized and analyzed. This paper explores a principle of the analysis of wet conductive coatings used for an algorithm on an example of high and low conductive coatings deposited on isolating and low conductive substrates with different parameters.

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