基于微偏振片阵列的并行相移动态数字全息成像技术

The Technology of Parallel Phase Shift Dynamic Digital Holography Imaging Based on Micro-polarizer Array

设计并实现了一种利用集成了微偏振片相移阵列的偏振相机来实现并行相移的动态数字全息成像系统。该系统利用1/4波片将参考光和测量光变为旋向相反的圆偏振光,接着利用偏振相机上的微偏振片相移阵列得到四幅相移相差π/2的全息图,然后利用四步相移算法解调得到全息图上的测量光光场分布,最后利用角谱法完成图像在近场的再现。仿真和实验研究表明,该技术成功消除了零级像和孪生像的干扰,能够实时记录待测物的动态变化,快速获得微米级分辨率的再现图像。

A dynamic digital holographic imaging system using a polarization camera integrated with a micro-polarizer phase shift array to achieve parallel phase shift was designed and implemented.The system used a quarter wave plate to turn the reference light and the measurement light into circularly polarized light with opposite rotation,then used the micro-polarizer phase shift array on the polarization camera to obtain four holograms with phase shift difference of π/2,and then used the four step phase shift algorithm to demodulate the measurement light field distribution of the hologram,and finally used the angle spectrum method to reproduce the image in the near field. The simulation and experimental results show that the technique successfully eliminates the interference of zero-order and twin images,and can record the dynamic changes of the objects to be measured in real time,and quickly obtain the reproduced image with micron resolution.