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bi-prism-based single-lens three dimensional digital image correlation system with a long working distance: Methodology and application in extreme high temperature deformation test

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Science China(Technological Sciences) 2018年第1期61卷 37-50页

作者： WU LiFu YIN YuanJie ZHANG Qi FANG DaiNing ZHANG Rubing ZHU JianGuo XIE HuiMin AML Department of Engineering Mechanics Tsinghua University Institute of Advanced Structure Technology Beijing Institute of Technology Department of Mechanics School of Civil Engineering Beijing Jiaotong University Faculty of Civil Engineering and Mechanics Jiangsu University

As a novel three dimensional digital image correlation （3D DIC） method, the bi-prism-based single lens （BSL） 3D DIC method has been proposed and developed in recent years. Making use ofa bi-prism, this method is able to perform a 3D DIC measurement using only a single camera. Thus, the integration level of a BSL 3D DIC system could be much higher than that of the double-camera 3D DIC system. In this paper, using a small-angle bi-prism and a camera with a longer focal length, a special BSL 3D DIC system with a long working distance is designed for measurements in extreme environments. The principle of the system is first studied, and practical methods are then proposed for the system set-up and the determination of system parameters. Then, feasibility of the measurement system is verified by out-of-plane rigid-body translation tests. Finally, the BSL 3D DIC system is proven to be capable of combining with a high-temperature testing instrument to perform deformation tests in a high-temperature environment of up to 1500℃.

关键词： three dimensional digital image correlation(3D DIC) single lens bi-prism high temperature deformation measurement

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Review of single-camera stereo-digital image correlation techniques for full-field 3D shape and deformation measurement

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Science China(Technological Sciences) 2018年第1期61卷 2-20页

作者： PAN bing YU LiPing ZHANG Qianbing Institute of Solid Mechanics Beihang University Department of Civil Engineering The University of Hong Kong

Single-camera stereo-digital image correlation(stereo-DIC) techniques have gained increasing attentions and demonstrated excellent prospects in the experimental mechanics community owing to their prominent advantages of cost-effectiveness,compactness, and the avoidance of the complicated camera synchronization. Using additional optical devices, e.g. a diffraction grating, a bi-prism or a set of planar mirrors, pseudo stereo images of a test sample surface can be recorded with a single *** correlating these stereo images using DIC, full-field three-dimensional(3 D) shape and deformation can be retrieved. This review comprehensively summarizes the historical development, methodologies, strengths and weaknesses of the diffraction grating-based, prism-based, four-mirror-adaptor-based single-camera stereo-DIC techniques, and the recently proposed novel full-frame single color camera-based stereo-DIC technique for full-field 3 D shape and deformation measurement. The optical arrangements, principles and calibration procedures of these single-camera stereo-DIC techniques are described in detail. Since high-speed deformation measurement is efficiently achieved by combining the single-camera stereo-DIC with one high-speed camera, single-camera stereo-DIC techniques show great potential in impact engineering, vibration and other dynamic tests.

关键词： single-camera stereo-DIC diffraction grating bi-prism four-mirror adapter

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