高对比度电磁散射中的普适早期响应
Universal early-time response in high-contrast electromagnetic scattering
摘要：
高导电目标在快速终止的电磁脉冲作用下的时域响应表现出三种不同的区域：早期、中期和晚期。中期和晚期的特征在于由指数衰减的本征模的叠加。在早期，数量不断增加的快速衰减模式的贡献，其结果是，散射电场显示出普遍的$t^{-1/2}$幂律，该幂律出现于由脉冲引起的表面电流模式的扩散衰减。幂律振幅反映了目标的表面几何形状，这一特性可能在地球物理遥感应用中的埋藏目标分类中证明是有用的。
英文摘要：
The time-domain response of highly conducting targets following a rapidly terminated electromagnetic pulse displays three distinct regimes: early, intermediate and late time. The intermediate and late times are characterized by a superposition of exponentially decaying eigenmodes. At early time an ever increasing number of rapidly decaying modes contribute, with the result that the scattered electric field displays a universal $t^{-1/2}$ power law which emerges from the diffusive decay of a pattern of surface currents induced by the pulse. The power law amplitude reflects the surface geometry of the target, a property that may prove useful in buried target classification in geophysical remote sensing applications.
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