Department of Electronics Engineering, Universidad de Guanajuato, Salamanca 36885, Mexico.
Physics Department, Miami Dade College, Miami, FL 33132, USA.
Sensors (Basel). 2022 Mar 10;22(6):2155. doi: 10.3390/s22062155.
The light polarization properties provide relevant information about linear-optical media quality and condition. The Stokes-Mueller formalism is commonly used to represent the polarization properties of the incident light over sample tests. Currently, different Stokes Polarimeters are mainly defined by resolution, acquisition rate, and light to carry out accurate and fast measurements. This work presents the implementation of an automatic Stokes dynamic polarimeter to characterize non-biological and biological material samples. The proposed system is configured to work in the He-Ne laser beam's reflection or transmission mode to calculate the Mueller matrix. The instrumentation stage includes two asynchronous photoelastic modulators, two nano-stepper motors, and an acquisition data card at 2% of accuracy. The Mueller matrix is numerically calculated by software using the 36 measures method without requiring image processing. Experiments show the efficiency of the proposed optical array to calculate the Mueller matrix in reflection and transmission mode for different samples. The mean squared error is calculated for each element of the obtained matrix using referenced values of the air and a mirror. A comparison with similar works in the literature validates the proposed optical array.
光的偏振特性提供了关于线性光学介质质量和状态的相关信息。Stokes-Mueller 形式常用于表示样品测试中入射光的偏振特性。目前，不同的 Stokes 偏振仪主要根据分辨率、采集率和光来实现准确和快速的测量。本工作提出了一种自动 Stokes 动态偏振仪的实现方法，用于表征非生物和生物材料样品。所提出的系统配置为在氦氖激光束的反射或透射模式下工作，以计算 Mueller 矩阵。仪器仪表阶段包括两个异步电光调制器、两个纳米步进电机和一个采集数据卡，精度为 2%。Mueller 矩阵通过软件使用 36 次测量方法进行数值计算，无需图像处理。实验表明，所提出的光学阵列在反射和透射模式下对不同样品计算 Mueller 矩阵的效率。使用空气和镜子的参考值计算得到矩阵中每个元素的均方误差。与文献中的类似工作进行比较验证了所提出的光学阵列。
