摘要
本文将数字散斑相关方法与显微放大技术相结合，对铜、钢双材料界面裂纹试作进行了研究，提出了频率城数字散斑相关法，该方法在频率域中利用物体变形前后散斑图对应子区域的相关搜索来测量物体的变形位移，该方法与常用的空间域数字相关法相比，避免了相关识别中的反复搜索，极大地提高了信息提取速度，并且具有更高的定位精度和测量精度．文章最后给出了实验结果．
The paper proved that the digital speckle correlation and micro--amplifer technique can be applied to measure a bimetallic model, The digital speckle correlation in the frequency domain is proposed. The correlation search of corresponding speckle subimages of before and after deformation is accomplished in the frequency domain to measure object'S displacement. The major disadvantage of the spatial cross--correlation approach is the great amount of time consumed in the calculation because of repetitive search. The speed of a cross--correlation calculation, however, is improved considerably by the performance of the digital correlation in the frequency domain. A more accurate estimate of the location and measurement is obtained by the method. The paper discussed and gave experimental res nits.
出处
《光子学报》
EI
CAS
CSCD
2000年第6期532-536,共5页
Acta Photonica Sinica
基金
山东省教委基金资助项目
关键词
数字散斑相关
裂纹尖端
材料
Digital speckle correlation
Crack-tip
Micro--amplifier technique
