Simulation Analysis of Nondestructive Testing Probe Made of Metamaterial

For investigating application of metamaterial at nondestructive inspection realm, simulation of improving of a nondestructive testing(NDT) probe electromagnetic radiant property by Metamaterials(MMs) cover a tiny current element is investigated and analyzed using Ansoft HFSS based on finite element method(FEM), whose permittivity and relative permeability are both negative. Electromagnetic model: ideal MMs ball shell film is with inner radius of 1 mm and outer radius variation, and the shell’s relative permittivity and relative permeability are all -3, dielectric loss tangent and magnetic loss tangent are all 0.1; and exciting current element length is with 0.3 mm, diameter 0.1 mm, value 1 mA at frequency 10 GHz; and simulation is with radiation boundary conditions. Simulating near electromagnetic field variation with ratio of inner radius and out radius, so near and local field of MMs probe on surface crack, and comparing near field value of probe coating common material are finished. Simulation results can be seen that for MMs film probe near electromagnetic field property is obviously better compared to other two kinds of structures without coating medium and coating with common medium, and metamaterial NDT electromagnetic probe including sound wave probe can be developed for potential practical applications in future.