Dynamic phase extraction in phase-shifted shearography

Yuanyuan Hou; Jiancheng Xu

doi:10.1117/12.2267390

8 March 2017 Dynamic phase extraction in phase-shifted shearography

Yuanyuan Hou, Jiancheng Xu

Proceedings Volume 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016; 1025506 (2017) https://doi.org/10.1117/12.2267390
Event: Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 2016, Jinhua, Suzhou, Chengdu, Xi'an, Wuxi, China

Abstract

Phase-shifted shearography needs to extract dynamic phase of the measured object after loading, so an algorithm for dynamic phase extraction in phase-shifted shearography is proposed to analyze the speckle patterns with random phase shifts. By using correlation method, the fringe patterns with random phase shifts are obtained from the speckle patterns with random phase shifts. Then the dynamic phase distributions are extracted from one set of random phase-shifted fringe patterns by principle component analysis. The experimental results show that the extracted phases are accurate and efficient. The proposed method is non-iterative and has no strict requirement for the spatial-carrier frequency of fringe patterns, so it is suitable for dynamic shearing speckle interferometry.

Citation Download Citation

Yuanyuan Hou and Jiancheng Xu "Dynamic phase extraction in phase-shifted shearography", Proc. SPIE 10255, Selected Papers of the Chinese Society for Optical Engineering Conferences held October and November 2016, 1025506 (8 March 2017); https://doi.org/10.1117/12.2267390

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KEYWORDS

Phase shifts

Fringe analysis

Shearography

Speckle pattern

Principal component analysis

Phase shift keying

Speckle

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