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Proceedings Paper

Digital speckle correlation method with compensation technique for strain field measurements
Author(s): Guan-chang Jin; Zhen Wu; Nai-Keng Bao; Xuefeng Yao
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Paper Abstract

In the strain field measurements especially in large strain field measurements, usually the correlation coefficient values obtained by the digital speckle correlation method are very low due to the relative pixel movement of the subset. Thus the measuring error will be increased. A primary method, that is called compensation algorithm, is introduced for improving the correlation coefficient. A flow scheme with the compensation algorithm of our software is developed and some improving techniques for reducing the calculation error are discussed in the paper. After getting a set of displacement data with high correlation, a de-noise wavelet processing is adopted. It is obviously that the measuring accuracy of the strain field is much better than before. The error is 0.1 to 0.3 pixels less than before. A strain field of testing experiment is performed with this compensation technique. The correlation coefficients can increase from 0.70 to 0.99 and that will be of much benefit for the improvements of the measuring accuracy.

Paper Details

Date Published: 13 June 2001
PDF: 7 pages
Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); doi: 10.1117/12.429568
Show Author Affiliations
Guan-chang Jin, Tsinghua Univ. (China)
Zhen Wu, Tsinghua Univ. (China)
Nai-Keng Bao, City Univ. of Hong Kong (Hong Kong)
Xuefeng Yao, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4317:
Second International Conference on Experimental Mechanics
Fook Siong Chau; Chenggen Quan, Editor(s)

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