秦绪志, 牛春晖, 陈世杰, 吕勇. 基于微面元理论的“猫眼”目标回波散射偏振特性研究[J]. 应用光学, 2020, 41(5): 916-923. DOI: 10.5768/JAO202041.0501007
引用本文: 秦绪志, 牛春晖, 陈世杰, 吕勇. 基于微面元理论的“猫眼”目标回波散射偏振特性研究[J]. 应用光学, 2020, 41(5): 916-923. DOI: 10.5768/JAO202041.0501007
QIN Xuzhi, NIU Chunhui, CHEN Shijie, LYU Yong. Analysis of polarization characteristics for cat’s eye target echo scattering based on microfacet theory[J]. Journal of Applied Optics, 2020, 41(5): 916-923. DOI: 10.5768/JAO202041.0501007
Citation: QIN Xuzhi, NIU Chunhui, CHEN Shijie, LYU Yong. Analysis of polarization characteristics for cat’s eye target echo scattering based on microfacet theory[J]. Journal of Applied Optics, 2020, 41(5): 916-923. DOI: 10.5768/JAO202041.0501007

基于微面元理论的“猫眼”目标回波散射偏振特性研究

Analysis of polarization characteristics for cat’s eye target echo scattering based on microfacet theory

  • 摘要: 为了研究“猫眼”目标表面回波散射偏振特性,基于微面元理论建立了偏振双向反射分布函数模型,指出线偏振光在“猫眼”目标表面回波散射的偏振度与目标表面粗糙度、复折射率以及入射角、探测角有关。主要研究“猫眼”目标表面粗糙度对其回波散射偏振度的影响,利用 Matlab 仿真得到“猫眼”目标回波偏振度与目标表面粗糙度参数 \sigma 的关系曲线。选择经过不同砂纸打磨的硅片作为“猫眼”目标进行实验,当硅片表面均方根高度分别为0.067 µm、0.554 µm、0.726 µm、1.651 µm、1.893 µm时,其表面回波散射偏振度的测量值依次为98.83%、98.16%、96.08%、94.91%、94.6%,表明“猫眼”目标回波散射的偏振度随其表面粗糙度的增大而减小。

     

    Abstract: In order to study the scattering polarization characteristics of cat's eye target echo, a polarized bidirectional reflection distribution function model was established based on the microfacet theory. The degree of polarization of the cat's eye target echo for linearly polarized light was related to target surface roughness, complex refractive index, incident angle and observation angle. The influence of the surface roughness of cat's eye target on the degree of polarization of its echo was studied. The relationship between the degree of polarization of cat's eye target echo and the target surface roughness parameter was obtained by Matlab simulation. The silicon wafers polished by different sandpapers were selected as the cat's eye target. When the root-mean-square heights of silicon wafers is 0.067 µm, 0.554 µm, 0.726 µm, 1.651 µm and 1.893 µm respectively, the degree of polarization of surface echo scattering is 98.83%, 98.16%, 96.08%, 94.91% and 94.6%, respectively. The degree of polarization of cat's eye target echo decreases with the increase of its surface roughness.

     

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