网格数字图像相关方法测量位移场的研究  

Displacement Measurement by Grid Digital Image Correlation

作　　者：龚浩瀚[1] 姜锦虎[1] 陈大庆[1] 

机构地区：[1]苏州大学理学院物理系,苏州215006

出　　处：《实验力学》2000年第2期246-252,共7页Journal of Experimental Mechanics

摘　　要：本文将数字图像相关方法与古老的网格法相结合 ,给出了一种测量面内位移场的新方法网格数字图像相关方法 ,实现了高精度的测量 ,精度可达 0 .0 2亚像素 .在该方法中网格点采用圆标记点 ,使该方法特别适用于小线应变位移场的研测 .本文运用 Windows下的新的图像采集方法测量物体位移场 ,突破了 Dos系统下对内存操作的限制 ,并使每一帧图像的像素数由 5 1 2× 5 1 2增至 76 8× 5 76 ,提高了图形的分辨率 .A new technique, which is the combination of digital image correlation algorithm and the archaic grid method, is presented for measuring of surface displacement field. The precision of measurement is about 0.02 pixel. In the technique, the grid is formed by small round dots, and this is especially suitable for use in displacement fields of small line strain. A new picture data collecting fashion under “Win98” operating system is adopted for overcoming the limit of memory under “Dos” system, and the image′s pixel number is raised from 512×512 to 768×576.

关 键 词：数字图像相关 网格法 全场位移 

分 类 号：O348[理学—固体力学] O432.2[理学—力学]