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Optical Engineering • Open Access

Real-time monitoring of phase maps of digital shearography
Author(s): Lianqing Zhu; Yonghong Wang; Nan Xu; Sijin Wu; Mingli Dong; Lianxiang Yang

Paper Abstract

Digital shearography has demonstrated great potential in direct strain measurement and, thus, has become an industrial tool for nondestructive testing (NDT), especially for NDT of delaminations and detection of impact damage in composite materials such as carbon fiber reinforced plastics and honeycomb structures. The increasing demand for high measurement sensitivity has led to the need for real-time monitoring of a digital shearographic phase map. Phase maps can be generated by applying a temporal, or spatial, phase shift technique. The temporal phase shift technique is simpler and more reliable for industry applications and, thus, has widely been utilized in practical shearographic inspection systems. This paper presents a review of the temporal phase shift digital shearography method with different algorithms and the possibility for real-time monitoring of phase maps for NDT. Quantitative and real-time monitoring of full-field strain information, using different algorithms, is presented. The potentials and limitations for each algorithm are discussed and demonstrated through examples of shearographic testing.

Paper Details

Date Published: 8 April 2013
PDF: 9 pages
Opt. Eng. 52(10) 101902 doi: 10.1117/1.OE.52.10.101902
Published in: Optical Engineering Volume 52, Issue 10
Show Author Affiliations
Lianqing Zhu, Beijing Information Science & Technology Univ. (China)
Yonghong Wang, Hefei Univ. of Technology (China)
Nan Xu, Oakland Univ. (United States)
Sijin Wu, Beijing Information Science & Technology Univ. (China)
Mingli Dong, Beijing Information Science & Technology Univ. (China)
Lianxiang Yang, Oakland Univ. (United States)

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