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在太赫兹与远红外频段,铝处于由导体到介质的过渡,研究该频段铝质目标与电磁波的相互作用机理对于实现太赫兹频段目标精确电磁散射计算具有重要意义.基于实验测量数据,设计有效误差准则模型拟合得到了太赫兹与远红外频段铝的介电系数模型;基于拟合模型通过推导过渡阶段不同损耗机理下铝中传播电磁波的空间相位系数与铝的波阻抗等参数,分析了太赫兹与远红外频段电磁波在铝中的透射与反射特性,给出了铝的反射率关于频率的变化曲线.结果表明铝中电磁波传播参数从微波向太赫兹频段过渡时具有很好的连续性与一致性;基于阻抗边界条件的雷达散射截面计算结果表明太赫兹频段光滑铝质目标可视做理想导体进行计算,太赫兹雷达散射截面测量中可利用光滑铝板或铝球做为定标体.
In the terahertz and far-infrared bands, the aluminum is in the transition from conductor to medium, so it is of great significance to study the interaction mechanism between aluminum target and electromagnetic wave in this frequency band for the purpose of accurate electromagnetic scattering calculation in the terahertz band.Based on the experimental measurement data, Based on the fitted model, the parameters of spatial phase coefficient and impedance of aluminum wave propagating in aluminum under different loss mechanisms in transition stage were analyzed. The transmission and reflection characteristics of terahertz and far-infrared electromagnetic waves in aluminum are given, and the change curves of reflectivity of aluminum with respect to frequency are given. The results show that the electromagnetic wave propagation parameters in aluminum have a good continuity from the microwave to the terahertz band The results show that the smooth aluminum target in terahertz band can be regarded as the ideal conductor to calculate. The measurement of terahertz radar cross section can be made by using smooth aluminum plate or aluminum ball as calibrator.