Real-time monitoring of phase maps of digital shearography

Lianqing Zhu; Yonghong Wang; Nan Xu; Sijin Wu; Mingli Dong; Lianxiang Yang

doi:10.1117/1.OE.52.10.101902

8 April 2013 Real-time monitoring of phase maps of digital shearography

Lianqing Zhu, Yonghong Wang, Nan Xu, Sijin Wu, Mingli Dong, Lianxiang Yang

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Optical Engineering, Vol. 52, Issue 10, 101902 (April 2013). https://doi.org/10.1117/1.OE.52.10.101902

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.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Lianqing Zhu, Yonghong Wang, Nan Xu, Sijin Wu, Mingli Dong, and Lianxiang Yang "Real-time monitoring of phase maps of digital shearography," Optical Engineering 52(10), 101902 (8 April 2013). https://doi.org/10.1117/1.OE.52.10.101902

Published: 8 April 2013

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KEYWORDS

Shearography

Nondestructive evaluation

Phase shifts

Fringe analysis

Cameras

Phase measurement

Speckle

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