Scattering and Reflection by Elliptically Striated Surfaces
Scattering and Reflection by Elliptically Striated Surfaces
复制标题
椭圆条纹表面的散射和反射
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
V. Twersky
中科院分区：
文献类型：
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作者：
J. Burke;V. Twersky
对于自由或刚性基面上随机分布的半椭圆凸点，给出了功率反射系数、相干反射波相位和单位面积微分散射截面的封闭近似。对于低频，孤立凸点所需散射振幅(f)的实部和虚部分别明确给出频率的8次和6次幂；对于高频，我们使用由几何反射项加上弗劳恩霍夫衍射项组成的f的近似。给出了从垂直条形到半圆，再到近极限条形的半椭圆的数值例子。
Closed‐form approximations for the power‐reflection coefficient, for the phase of the coherently reflected wave, and for the differential‐scattering cross section per unit area, are given for random distributions of semielliptic protuberances on free or rigid base planes. For low frequencies, the real and imaginary parts of the required scattering amplitude (f) of an isolated protuberance are given explicitly to the eighth and sixth power of the frequency, respectively; for high frequencies, we use an approximation for f consisting of the geometrically reflected term plus a Fraunhofer diffracted term. Illustrative numerical examples are given for semiellipses ranging from perpendicular strips, through semicircles, to the near‐limiting case of nearly flat strips.