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Proceedings Paper

Digital speckle shearing interferometry use of linear CCD scanning
Author(s): Jianlin Zhao; Jianglei Di; Weiwei Sun; Qian Wang; Xiangyang Jiao; Xiaobo Yan
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Paper Abstract

Digital speckle shearing interferometry is an optical, non-contactive and non-destructive method widely used for the stress and strain analysis of objects. In this paper, linear CCD, instead of area CCD arrays, is presented to record large area speckle shearing interferogram. Digital speckle shearing interferometry by use of linear CCD scanning can be effectively used to measure the out-of-plan deformation of the objects and get a wide filed of view in continuous scanning imaging. Especially for the objects with a wide range, it's very convenient to get the whole speckle shearing interferogram in one time. In the paper, large area interferograms with 3.5cm×3.5cm (5000×5000 pixels) pre-and-past loading are recorded by using linear CCD and processed with correlation algorithm and median filter. The experimental results show that the proposed method is feasible in the digital speckle shearing interferometry and have a great advantage in the measurement of objects with large size compared with general area CCD.

Paper Details

Date Published: 14 April 2010
PDF: 6 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75224R (14 April 2010); doi: 10.1117/12.851698
Show Author Affiliations
Jianlin Zhao, Northwestern Polytechnical Univ. (China)
Jianglei Di, Northwestern Polytechnical Univ. (China)
Weiwei Sun, Northwestern Polytechnical Univ. (China)
Qian Wang, Northwestern Polytechnical Univ. (China)
Xiangyang Jiao, Northwestern Polytechnical Univ. (China)
Xiaobo Yan, Northwestern Polytechnical Univ. (China)

Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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