摘要
为了探索超电磁材料在无损检测领域的应用,采用双负超电磁材料球壳包覆一个微小电流元的模型,应用基于有限元法(FEM)的Ansoft HFSS软件,模拟超电磁材料改善无损检测探头电磁辐射的特性。电磁模型的内半径r_1=1.0 mm,外径为变量;介质ε_r=μ_r=-3,电损耗和磁损耗为0.1;电流元为长0.3 mm、直径0.2 mm,激励电流1 mA,频率为10 GHz,辐射边界。模拟了三种情形下近电场随球壳内外径比值的变化、涂覆超电磁材料的探头在表面开口裂缝附近形成的电场,并与涂覆常规电磁材料的探头形成的近场量值进行对比。试验得出,涂覆超电磁材料的探头其近场电磁特性优于涂覆常规材料和不涂材料,可用于开发未来超电磁材料的无损检测探头。
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.
出处
《无损检测》
2010年第5期345-348,共4页
Nondestructive Testing
