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Mirror-assisted multiview DIC for 360° panoramic large deformation measurement
Optics and Lasers in Engineering ( IF 4.6 ) Pub Date : 2021-06-01 , DOI: 10.1016/j.optlaseng.2021.106673
Pengxiang Ge , Huanqing Wang , Qian Zhang , Haotian Xie , Yonghong Wang

In this paper, we propose a new technique to achieve 360° panoramic large deformation measurement with the help of trinocular digital image correlation (3DT-DIC) system assisted by two mirrors. Two reflecting mirrors can image the rear of the specimen with virtual reality (secondary reflection). The trinocular vision system simultaneously captures the deformation images of the front and rear of the specimen and completes 360° profile reconstruction and large deformation measurement. The 3DT-DIC system can effectively solve the problems of field-of-view occlusion and receding correlation during the large deformation and distortion of the specimen. A printed speckle pattern for precise positioning of the two reflecting mirrors’ poses and virtual reality transformation during the mirror imaging are introduced. Static and dynamic experiments are conducted separately. Experimental results show that the proposed method has better 360° panoramic reconstruction and stress–strain measurement capability. Compared with the binocular DIC system, the proposed method can calculate more effective points and has better 3D reconstruction capability under distorted large deformation. The proposed method can effectively solve the problems of field-of-view occlusion and receding correlation under large deformation. It provides a new idea for realizing 360° panoramic large deformation measurement.



中文翻译:

用于 360° 全景大变形测量的镜面辅助多视图 DIC

在本文中,我们提出了一种新技术,在两面镜辅助下的三目数字图像相关(3DT-DIC)系统的帮助下实现360°全景大变形测量。两个反射镜可以通过虚拟现实(二次反射)对标本的背面进行成像。三目视觉系统同时捕捉试样前后的变形图像,完成360°轮廓重建和大变形测量。3DT-DIC系统可以有效解决试样大变形扭曲过程中的视野遮挡和相关性后退问题。介绍了一种印刷散斑图案,用于在镜面成像过程中精确定位两个反射镜的姿态和虚拟现实变换。静态和动态实验分开进行。实验结果表明,该方法具有较好的360°全景重建和应力应变测量能力。与双目DIC系统相比,该方法可以计算出更多的有效点,并且在扭曲大变形下具有更好的3D重建能力。该方法能有效解决大变形下的视场遮挡和相关性后退问题。为实现360°全景大变形测量提供了新思路。所提出的方法可以计算出更多的有效点,并且在扭曲大变形下具有更好的3D重建能力。该方法能有效解决大变形下的视场遮挡和相关性后退问题。为实现360°全景大变形测量提供了新思路。所提出的方法可以计算出更多的有效点,并且在扭曲大变形下具有更好的3D重建能力。该方法能有效解决大变形下的视场遮挡和相关性后退问题。为实现360°全景大变形测量提供了新思路。

更新日期:2021-06-01
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