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摘要研究目标表面的后向光散射特性对于激光雷达系统的优化设计与性能评估具有重要意义。为此，论文在深入资料调研的基础上，选择斯托克斯矢量方法测量目标表面后向光散射的偏振特性，并搭建了相应的实验装置。该装置能在905nm波段研究目标表面后向散射光斯托克斯参量随入射角变化。在实验上，测量多块不同粗糙程度的镍合金样板以及不同规格砂纸等目标的后向散射光斯托克斯参量，并据此分析了入射角变化、入射光偏振态、表面粗糙度和目标材质对后向散射光偏振特性的影响。结果表明：不同偏振态的入射光对同一粗糙表面照射，P光入射时的偏振度要大于S光入射时的偏振度；粗糙度大的目标的后向散射光偏振度小；在相同情况下，镍合金样板比毛玻璃有更好的保偏特性，即金属有较强的保偏效果。10198
- 上一篇：弱吸收物体光相位场的定量测量研究
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该测量方法为认识各种材料的后向散射光特性提供了依据，对于激光探测领域的相关研究有一定的参考价值。
关键词 随机粗糙表面，后向散射，偏振测量，斯托克斯参量
毕业设计说明书（论文）外文摘要
Title The laser polarization scattering characteristics of the rough
surface
Abstract
The targets’ backscattering characteristics affect the performance of the laser radar directly, and also the research of these characteristics is very important to the system optimization of the laser radar or the laser rangefinder. On the basis of previous theories, we conducted the experiments on the targets' backscattering characteristics. These experiments mainly measured the Stokes parameters of backscattering lights and those devices of experiments worked in 905nm band. We mainly compared both P-polarized light and S-polarized light incidences three nickel alloy plates and several sandpaper with different roughness to analyze the effect of backscattering characteristics on different material, roughness and also different incident angle and different polarization light. We have the following conclusion: For the same surface, the polarization degree of backscattering light is higher when P-polarized light incidences. For the same material targets, the polarization degree is higher when roughness is lower. Compared with frosted glass, nickel alloy plates have stronger polarization characteristic. This paper did a preliminary summary of light's backscattering characteristics of several groups of different materials, different roughness surfaces, also the characteristics and the theories math pretty well. The data provide an understanding of the light's backscattering characteristics of rough surface, and have a certain reference value on the research of laser detection.
Keywords Random rough surface, Backscattering light, Polarization measure, Stokes parameters
目录
摘 要 I
Abstract II
1 引言 1
1．1 研究背景 1
1．2 国内外研究现状 2
1.2.1 粗糙表面激光散射偏振特性的理论研究 2
1.2.2 粗糙表面激光散射偏振特性的实验研究 3
1.3 本文主要工作 6
2 粗糙目标表面光散射的基本理论 7
2.1 随机粗糙表面的统计描述 7
2.2 随机粗糙表面的光散射理论 8
2.2.1 散射场和散射功率 8
2.2.2 散射系数和后向散射系数 10
3 典型目标退偏特性的测量原理和方法 15
3．1散射场偏振度和退偏度的定义 15
3. 2斯托克斯参量与光波的偏振态 16
3.2.1 斯托克斯参量的定义 16