Mirror-assisted multiview DIC for 360° panoramic large deformation measurement

Ge, Pengxiang; Wang, Huanqing; Zhang, Qian; Xie, Haotian; Wang, Yonghong

doi:10.1016/j.optlaseng.2021.106673

Cited by 17 publications

(3 citation statements)

References 31 publications

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“…So far, 360° DIC has been used to measure displacements/strains of biological samples of animals or humans in vitro (e.g., the mentioned publications by Genovese et al) and in vivo [ 33 , 36 , 51 ], technical materials [ 49 , 50 , 60 ] and, as the only plant example, a compression test of a timber column [ 40 ]. Non-circular multi-view DIC methods are predominantly used for measuring larger scale engineering structures [ 34 , 37 , 38 , 61 , 62 , 63 ].…”

Section: Introductionmentioning

confidence: 99%

Stereo Camera Setup for 360° Digital Image Correlation to Reveal Smart Structures of Hakea Fruits

Fischer,

Mylo,

Lorenz

et al. 2024

Biomimetics

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About forty years after its first application, digital image correlation (DIC) has become an established method for measuring surface displacements and deformations of objects under stress. To date, DIC has been used in a variety of in vitro and in vivo studies to biomechanically characterise biological samples in order to reveal biomimetic principles. However, when surfaces of samples strongly deform or twist, they cannot be thoroughly traced. To overcome this challenge, different DIC setups have been developed to provide additional sensor perspectives and, thus, capture larger parts of an object’s surface. Herein, we discuss current solutions for this multi-perspective DIC, and we present our own approach to a 360° DIC system based on a single stereo-camera setup. Using this setup, we are able to characterise the desiccation-driven opening mechanism of two woody Hakea fruits over their entire surfaces. Both the breaking mechanism and the actuation of the two valves in predominantly dead plant material are models for smart materials. Based on these results, an evaluation of the setup for 360° DIC regarding its use in deducing biomimetic principles is given. Furthermore, we propose a way to improve and apply the method for future measurements.

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Section: Introductionmentioning

confidence: 99%

Stereo Camera Setup for 360° Digital Image Correlation to Reveal Smart Structures of Hakea Fruits

Fischer,

Mylo,

Lorenz

et al. 2024

Biomimetics

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“…As a low-cost device that can change the light path, the planar mirror has been successfully applied in the DIC field. [22][23][24][25] Zhu et al 26 proposed a system that combines 2D-DIC with dual 45 deg mirrors imaging technology to simultaneously measure the deformation of both surfaces of a specimen. This method can be extended to ex-situ 2D-DIC deformation measurements.…”

Section: Introductionmentioning

confidence: 99%

“…However, the fixed field of view of this system greatly limits its application. As a low-cost device that can change the light path, the planar mirror has been successfully applied in the DIC field 22 – 25 Zhu et al.…”

Section: Introductionmentioning

confidence: 99%

Ex-situ deformation measurement system based on dual-reflector

Sun,

Ge,

et al. 2023

Opt. Eng.

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.We propose an ex-situ reposition error compensation method to solve the reposition error in the ex-situ state of 2D digital image correlation (2D-DIC) in the long-term deformation of the measurement specimen or under special load deformation. Using the dual-reflector auxiliary measurement system with an included angle of 90 deg, the two sides of the repositioned specimen are mapped into left and right mirrors. The in- and out-of-plane rigid body displacements are compensated via the error compensation method, and the real in-plane displacement of the tested specimen is obtained. The accuracy and practicability of this method are verified by conducting an in-plane rigid body displacement experiment, unloaded specimen reposition experiment, thermal deformation experiment, and finite element analysis. We provide a simple, effective, and high-precision deformation measurement method for 2D-DIC to realize ex-situ measurement.

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