Abstract

Shearography is a non-destructive testing technique that provides full-field surface strain characterization. Previous inspection of flat objects or simple geometric shapes has been reported. However, real-life objects especially in aerospace, transport, or cultural heritage are not flat, but their inspection with shearography is of interest for both hidden defect detection and material characterization. Accurate strain measurement of a highly curved or free-form surface needs to be performed by combining in-line object shape measuring and processing of the shearography data in 3D. Previous research has not provided a general solution for that. This paper presents a new approach of 3D shape shearography which is based on the integration of a structured light projector for in-line shape measuring with 3D shearography. For the experimental part, a 3D shape shearography system prototype was developed and its performance was evaluated with a cylinder specimen loaded by internal pressure and compared with strain gauges.

© 2019 Optical Society of America

3D shape and strain measurement of a thin-walled elastic cylinder using fringe projection profilometry

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Simultaneous 3D measurement of deformation and its first derivative with speckle pattern interferometry and shearography

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Single-shot 3D shape measurement of discontinuous objects based on a coaxial fringe projection system

Zhangying Wang, Zonghua Zhang, Nan Gao, Yanjun Xiao, Feng Gao, and Xiangqian Jiang
Appl. Opt. 58(5) A169-A178 (2019)

Real-time dual-sensitive shearography for simultaneous in-plane and out-of-plane strain measurements

Jie Dong, Shengjia Wang, Min Lu, Martin Jakobi, Zhanwei Liu, Xingchen Dong, Franziska Pöller, Laura Maria Bilgeri, Félix Salazar Bloise, Ali K. Yetisen, and Alexander Walter Koch
Opt. Express 27(3) 3276-3283 (2019)