基于条纹中心线法的电子散斑干涉条纹信息提取

Extracting Information of ESPI Fringes Based on Fringe Center Method

电子散斑干涉技术(ESPI)是光学测量的一种重要的方法,对ESPI条纹的信息提取是ESPI进行光学测量的关键步骤之一,本文在介绍电子散斑干涉条纹中心线法的基础上,开展了ESPI条纹图预处理和基于条纹细化算法的骨架线提取的研究,包括对细化的条纹进行修整、拟合,该方法可以实现条纹骨架的快速、准确的自动提取。设计了一套应力形变装置,运用电子散斑干涉条纹中心线法对试件表面的形变进行实际检测,得到测量结果,对结果进行了分析,实验测量值与实际相符。

The electronic speckle pattern interferometry （ESPI） is one of the important optical measurement methods. The extracting information of the ESPI fringes is one of the key technologies during ES- PI application. A fringe center method for ESPI interferogram analysis and a method based on the fringe refinement algorithm are introduced. The thin skeletons are amending to be smooth. The method can automatically pick up the fringe skeletons. A measurement experiment by using this technique is used to detect and analyze the deformation of the sample. The result is in agreement with the actual situation.