各向异性准均匀介质散射场的相干特性研究

【作者】 陈晶晶； 辛煜； 陈延如； 陈斐楠； 赵琦；

【机构】 南京理工大学电子工程与光电技术学院；

【摘要】 将电磁平面波入射到准均匀性介质后散射场的相干特性的研究扩展到各向异性准均匀介质,也就是其散射势是3乘3的矩阵,在假设其散射势矩阵为对角矩阵的情况下,通过计算得到了各向异性准均匀介质的三维散射场的交叉谱密度,光谱密度和光谱相干度的表达式。然后进行了模拟仿真,假设各向异性介质散射势的每一个分量都是高斯相关的,在同一幅图中表示出各向异性和对应各项参数的各项同性介质的归一化光谱密度,进行了对比,改变参量得到另外的仿真图,发现光谱密度近似为各项同性介质的平均,但是各个分量的权重不但不同而且随着角度的变化而变化;而光谱相干度却是振荡的,是分三个阶段的。更多还原

【Abstract】 We work over the scattering electromagnetic field generated by an anisotropy quasi-homogeneous media.That means the scattering potential is a matrix of 3 × 3.We assume that the scattering potential matrix of the anisotropy quasi-homogeneous media is diagonally.Then the analysis formulas for spectral density and spectral degree of coherence of the scattering electromagnetic field are derived.After that the computer simulation is made.First the normalized spectral density of the field scattering by anisotropy media and the same properties scattering by the corresponding isotropy media is described in the same figure.Then we change the parameters of the anisotropy media and obtain another figure.We find the normalized spectral density of the anisotropy media is close to the average of the three isotropy media.But the weight of every component is not only different with each other but also changing as the angle changes.At last,we describe the spectral degree of coherence in the same way.And we find out that the spectral degree of coherence of anisotropy media is oscillated as a function of the angle.更多还原