A technique based on the superposition of two uncorrelated speckle patterns and speckle contrast measurement is proposed and demonstrated to track the polarization rotation of an optical beam behind a scattering layer. One of the superposed speckle patterns is considered as reference, and it is shown that with the help of the reference speckle pattern of a known linear polarization, it is possible to track the polarization rotation behind a scattering layer in a non-invasive manner by measuring the contrast of the resultant speckle pattern. The working principle and the experimental demonstration of the proposed technique are presented, and the experimental results are compared with the theoretically predicted values. The performance of the proposed technique is quantitatively evaluated by determining the rotation of the polarization vector behind the scattering layer for two different cases, namely, polarization rotation by a half-wave plate and sugar solution of different concentrations, and good matches are found between the experimental results and the theoretical prediction. Issues like resolution of tracking the polarization vector rotation and determination of sugar solution concentration are also discussed in the context of the experimental results. The proposed technique can have potential applications in non-invasive sensing and biomedical studies.

提出了一种基于两个不相关的散斑图样叠加和散斑对比度测量的技术，该技术可以跟踪散射层后面的光束的偏振旋转。叠加的斑点图样之一被视为参考，并且显示出借助于已知线性偏振的参考斑点图样，可以通过测量来以非侵入方式跟踪散射层后面的偏振旋转。所得斑点图案的对比度。介绍了该技术的工作原理和实验证明，并将实验结果与理论预测值进行了比较。通过确定两种情况下散射层后面的偏振矢量的旋转，即半波片和不同浓度的糖溶液的偏振旋转，定量地评估了所提出技术的性能，发现两者之间存在良好的匹配。实验结果和理论预测。在实验结果的背景下，还讨论了诸如跟踪极化矢量旋转的分辨率和确定糖溶液浓度的问题。所提出的技术在无创传感和生物医学研究中可能具有潜在的应用。实验结果与理论预测值吻合良好。在实验结果的背景下，还讨论了诸如跟踪极化矢量旋转的分辨率和确定糖溶液浓度的问题。所提出的技术在无创传感和生物医学研究中可能具有潜在的应用。实验结果与理论预测值吻合良好。在实验结果的背景下，还讨论了诸如跟踪极化矢量旋转的分辨率和确定糖溶液浓度的问题。所提出的技术在无创传感和生物医学研究中可能具有潜在的应用。