基于EALCD的散斑照相术物面位移测试研究

摘要

In order to solve complicated problems of the development and fixation of holographic plate, combined with electrically addressed liquid crystal display (EALCD) and conventional optical path of speckle photography, CCD is used in the recording of speckle patterns instead of negatives or holographic plate. And EALCD is used in the reconstruction of speckle patterns, all speckle patterns are stored by computer, so the de⁃ficiency of traditional speckle photography is made up. Basic principles of measurement and arrangement of op⁃tical path are researched and experimental results are given. The optical path of recording and reconstruction are all modified based on Twyman Green, not only the optical structure is simple throughout the experimental process but also the application of optical elements is less. EALCD is placed in the corresponding position of the optical path to realize the reconstruction of Young’s fringes, the experimental results are accurate, reliable and have high measuring accuracy.%为了解决全息干板使用过程中显影、定影等一系列繁琐的问题，应用电寻址液晶（EALCD）和传统的散斑照相光路相结合，用CCD代替底片或全息干板记录散斑图样，用EALCD实现散斑图的再现，所有散斑图样都由计算机存储，这样就弥补了传统散斑照相技术的不足。对测量的基本原理、实验光路的布置进行了研究，给出了实验结果，记录和再现光路都是在泰曼格林光路的基础上进行修改，整个实验过程光路结构简单，应用的光学元器件少，将EALCD放置在光路中的相应位置实现杨氏条纹的再现，实验结果准确可靠、测量精度高。