Improved depth characterization of internal defect using the fusion of shearography and speckle interferometry

被引：0

作者：

Gu G. ^{[1
]}

Pan Y. ^{[2
]}

Qiu C. ^{[1
]}

Zhu C. ^{[1
,3
]}

机构：

[1] School of Civil Engineering, Yancheng Institute of Technology, Yancheng

[2] College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing

[3] Institute of Building Materials, Vilnius Gediminas Technical University, Vilnius

来源：

Optics and Laser Technology | 2021年 / 135卷

基金：

中国国家自然科学基金;

关键词：

Defect depth characterization; Digital speckle pattern interferometry; Dual-sensitive speckle interferometry; Nondestructive testing; Shearography;

D O I：

10.1016/j.optlastec.2020.106701

中图分类号：

学科分类号：

摘要：

A hybrid nondestructive testing (NDT) approach based on the fusion of shearography and digital speckle pattern interferometry (DSPI) is proposed for depth characterization of internal defect. To this end, a novel dual-sensitive speckle interferometry system is developed for both shearography and DSPI measurements. On one hand, shearography imaging results are used to identify the internal defect location, shape, and boundary qualitatively for the preparation of subsequent depth characterization. On the other hand, an improved mechanical model combined with bending theory and DSPI imaging results is built to perform the internal defect depth prediction. Finally, the hybrid NDT experiment for a thin metallic plate with an internal planar defect is conducted for feasibility validation of the proposed fusion method. The results indicate that the relative error of defect depth detection is less than 5% compared to the existing method and show that the proposed fusion method can successfully perform improved depth characterization of internal defect. © 2020 Elsevier Ltd

引用

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