变形测量中的数字散斑相关搜索方法

Digital Speckle Correlation Method of Deformation Measurement

本文用仿射变换阐述了数字散斑相关方法的基本原理,通过分析散斑位移及其导数对物体变形前后散斑图的相关性的影响,对相关算法作了简化,提出了相关搜索方法.典型的实验证实了该方法的可行性,同时就散斑颗粒尺寸、子区大小对相关识别的影响等问题进行了讨论,初步给出了相关计算的有关最佳参数.

The basic principle of digigtal speckle correlation method is described with the affine transformation in this paper.Based on the analysis of the effects of speckle displacements and their derivatives upon the correlation of specklegrams which are exponsed before and after object deformation,the correlation algorithm is simplified,and a correlation search method is presented.Typical experiments have proved the feasibility of the method.Influences of the sizes of speckle and subregion on correlation recognition are also discussed,and the corresponbing optimized parameters of correlation computing are given.