摘要
介绍了数字散斑相关方法的基本原理,利用模拟散斑图分析了3种常用亚像素算法的性能.根据数字散斑相关方法测量微位移的特点,采用爬山搜索法进行整像素搜索,采用计算量小、计算精度高的基于梯度的算法进行亚像素搜索.利用千分表和数字散斑相关方法对有机玻璃梁试件三点弯曲中心挠度进行了测量,并与有限元计算结果进行了比较.结果表明,数字散斑相关方法测量微位移的实验系统是可靠的,在此基础上测量了试件加载位置附近区域的全场位移.
The principle of digital speckle correlation method(DSCM) is introduced in this paper,and the capabilities of three sub-pixel searching algorithms are analyzed using simulated speckle images.The coarse searching algorithm based on hill climbing method is used in DSCM,and sub-pixel searching based on spatial-gradient algorithm is used in DSCM which has less computation and high precision.The deflection in the center of three-point bending plexiglass specimen was measured by micrometer gauge and DSCM,and the ...
出处
《山东理工大学学报（自然科学版）》
CAS
2009年第1期49-52,共4页
Journal of Shandong University of Technology:Natural Science Edition
关键词
数字散斑相关
微位移测量
梯度算法
digital speckle correlation
micro-displacement measurement
gradient-based algorithm
