Energy, Electromagnetic Testing
High-Frequency Eddy Current Measurement of Graphene Doping Content in Silver/Graphene Coatings Using Effective Medium Theory
ABSTRACT
The graphene doping content in silver/graphene coatings is critical for quality control. In this study, a characterization method based on apparent eddy current conductivity is proposed. First, the linear relationship between electrical conductivity and doping amount is developed using the Maxwell–Garnett effective medium theory. Second, a mapping model relating apparent eddy current conductivity to impedance signals is constructed by combining a transformer equivalent circuit. The characteristics of the eddy current field in silver/graphene composite coatings are investigated via finite-element simulation, and high-frequency excitation is used to suppress the influence of coating thickness. An embedded eddy current system based on Zynq SoC is developed, adopting digital quadrature demodulation technology to extract weak impedance signals.
KEYWORDS: silver/graphene composite coatings, eddy currents, apparent conductivity, embedded system
https://doi.org/10.32548/2026.me-04581
