埋藏导体表面电磁波散射特性研究

根据几何绕射理论,利用时域有限差分方法研究了导体球表面电磁波的散射和绕射,分析了导体表面爬行波的特点,并计算了埋藏在沙土中的不同电导率金属球表面电磁波的散射特征。计算及图像分析结果表明,在介质外接收到的电磁波是多次反射波的叠加;利用散射电磁波峰值之间的关系,可以预测埋藏金属物的深度。

Research on the Properties of Creeping Electromagnetic Wave on the Conductor Surface

Based on geometric diffraction theory,Finite difference in time domain is used to study the scattering and diffraction of electromagnetic waves on the surface of conductor sphere,to analyze the properties of creeping waves on the conductor surface and to calculate the scattering features of the electromagnetic waves on the metal sphere with different conductivities,buried in the sandy soils.The results from the calculation and image analysis indicate that the electromagnetic waves recieved from the outside medium are the superposition of multi-reflected electromagnetic waves and that the relationship among the peaks of scattered electromagnetic waves can be used to predict the depth for burrying metal substances.Calculation results show that,outside the medium,the electromagnetic wave is the superposition of multi-reflected electromagnetic waves.It is demonstrated that the depth of the buried metal can be predicted by using the relationship among the peaks of scattered electromagnetic waves.