Design and application of digital speckle patterns in digital image correlation method

Wei QIAN; Ming JIANG

doi:10.37188/YJYXS20203508.0861

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Design and application of digital speckle patterns in digital image correlation method

Image Processing | 更新时间：2020-08-11

- Design and application of digital speckle patterns in digital image correlation method
- Chinese Journal of Liquid Crystals and Displays Vol. 35, Issue 8, Pages: 861-869(2020)
- 作者机构：
  
  1.苏州科技大学数理学院, 江苏苏州 215009
  2.苏州科技大学土木学院, 江苏苏州 215009
- 作者简介：
- 基金信息：
- DOI：10.37188/YJYXS20203508.0861
  CLC： TP391.4
- Received：12 January 2020，
  
  Revised：02 March 2020，
  
  Accepted：02 March 2020，
  
  Published：2020-08
- 稿件说明：
移动端阅览
Wei QIAN, Ming JIANG. Design and application of digital speckle patterns in digital image correlation method[J]. Chinese journal of liquid crystals and displays, 2020, 35(8): 861-869.
DOI：

Wei QIAN, Ming JIANG. Design and application of digital speckle patterns in digital image correlation method[J]. Chinese journal of liquid crystals and displays, 2020, 35(8): 861-869. DOI： 10.37188/YJYXS20203508.0861.

摘要

针对数字图像相关（DIC）实验中，普通喷漆散斑无法满足超高温环境需求，研究了数字散斑场（DSPs）的制作和转移方法。数字散斑场的设计通过矩阵转换确定每个散斑点的圆心坐标，然后给每个圆心坐标施加一个随机度，并由MATLAB软件编程实现。用激光打标技术将其转移到试件表面，通过圆度和面积比分析了散斑的精度，并通过平均灰度梯度法将喷漆散斑和数字散斑场进行对比分析。研究结果表明，运用激光打标技术转移的数字散斑场精度高于普通喷漆散斑且质量稳定。将数字散斑场运用于拉伸和高温焊接实验，实验中散斑随着试件一起变形，没有出现脱落及遇高温融化等现象。

Abstract

Aiming at the digital image correlation (DIC) experiment

ordinary paint speckle can not meet the requirement of ultra-high temperature environment

the method of designing and transferring the digital speckle patterns (DSPs) is studied. The design of the digital speckle patterns determine the circle center coordinates of each speckle by matrix transformation

and then a random degree is applied to each circle center coordinate

and it is programmed by Matlab. The laser marking technology is used to transfer it to the surface of the test piece. The accuracy of speckles are analyzed by roundness and area ratio

and the paint speckles and DSPs are compared and analyzed by the average speckle gradient method. The results show that the accuracy of DSPs transferred by laser marking technology is higher than that of ordinary spray paint speckle

and the quality is stable. The DSPs is used in the high-temperature welding test. In the test

the speckle is deformed along with the test piece

and no phenomena such as shedding and melting under high-temperature occurred.

关键词

Keywords

references

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