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Proceedings Paper

Improved digital speckle correlation method and its application in copper thin film
Author(s): Huaiwen Wang; Yilan Kang
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Paper Abstract

The digital speckle correlation method (DSCM) is a rapidly developing technique of photomechanics. It has been used to measure the surface deformation for its advantages of non- contact, real time, whole field and direct measurement. In this paper, an algorithm is proposed by introducing optimization theory into DSCM. In the improved DSCM, the 1D search determines the step size of iteration, and the inverse matrix of second- order derivative matrix of correlation function is calculated by the quasi-Newton method. By the improvement, the computational; workload is reduced and the convergence velocity is improved. This paper also illustrates the application of digital speckle correlation method in experimental fracture analysis of copper film. Experimental results show that the improved DSCM is an efficacious test techniques in studying the fracture behavior of thin film materials.

Paper Details

Date Published: 29 May 2002
PDF: 3 pages
Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); doi: 10.1117/12.468807
Show Author Affiliations
Huaiwen Wang, Tianjin Univ. (China)
Yilan Kang, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 4537:
Third International Conference on Experimental Mechanics
Xiaoping Wu; Yuwen Qin; Jing Fang; Jingtang Ke, Editor(s)

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