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Proceedings Paper

New optical strain method of three-beams interferometry and digital image processing
Author(s): L. A. Li; Z. Y. Wang; S. B. Wang; P. Goudeau; J. W. Tong
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Paper Abstract

Based on the optical diffraction and interference, a new method of digital image processing is presented for the in-plane strain measurements in macro and micro-zone. The principle of the improved moire interferometry and the algorithm are presented in this paper. In this study, the cross grating of the frequency of 1200 l/mm is replicated on the specimen surface. Three coherent laser beams are used to obtain the U+V and U-V fringe patterns. Combining the FFT phase shift technique and subpixel technique, the displacement components U and V are calculated with the high precision. The new method has some advantages, such as simple optical arrangement, direct calculation of U and V fields with higher precision. Using this method, the displacement and strain fields on the free-edge of the thermo-plastic composite laminates AS4/PEEK[0/±45/90]7S (56-ply) under three-point bending have been measured. The corresponding numerical simulation has been carried out using three-dimensional orthotropic elastic finite element model method. It is believed that this method will be a powerful tool in characterizing the mechanical properties of materials.

Paper Details

Date Published: 12 April 2005
PDF: 6 pages
Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); doi: 10.1117/12.621900
Show Author Affiliations
L. A. Li, Tianjin Univ. (China)
Z. Y. Wang, Tianjin Univ. (China)
S. B. Wang, Tianjin Univ. (China)
P. Goudeau, Univ. de Poitiers (France)
J. W. Tong, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 5852:
Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics
Chenggen Quan; Fook Siong Chau; Anand Asundi; Brian Stephen Wong; Chwee Teck Lim, Editor(s)

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