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Influence of in-plane displacement and strain components on slope fringe distributions in double-aperture speckle wedge-shearing interferometry |
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| Authors: | K F Wang A K Tieu E B Li |
| Institution: | a Department of Mechanical Engineering, Engineering College, Yangzhou University, Yangzhou, Jiangsu 225009, People's Republic of China b Department of Mechanical Engineering, Faculty of Engineering, University of Wollongong, Wollongong, NSW 2522, Australia |
| Abstract: | The influence of in-plane displacement and strain components on slope (first-order derivative of out-of-plane displacement component) fringe distributions in double-aperture speckle wedge-shearing interferometry is discussed in detail. The research results show that only the in-plane displacement component parallel to the centre line of double apertures has an influence on the slope fringe distributions. It is also shown that the in-plane strain components have no influence on the slope fringe distributions when utilising normal illumination and an axisymmetric system. A theoretical analysis and an experimental demonstration are given. The experimental results are in good agreement with the quantitative analysis. |
| Keywords: | Speckle shearing interferometry Slope In-plane displacement and strain |
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