Background

Developments in digital image correlation (DIC) in the last decade have made it a practical and effective optical technique for displacement and strain measurement at high temperatures.

Objective

This overview aims to review the research progress, summarize the experience and provide valuable references for the high-temperature deformation measurement using DIC.

Methods

We comprehensively summarize challenges and recent advances in high-temperature DIC techniques.

Results

Fundamental principles of high-temperature DIC and various approaches to generate thermal environment or apply thermal loading are briefly introduced first. Then, the three primary challenges presented in performing high-temperature DIC measurements, i.e., 1). image saturation caused by intensified thermal radiation of heated sample and surrounding heating elements, 2) image contrast reduction due to surface oxidation of the heated sample and speckle pattern debonding, and 3) image distortion due to heat haze between the sample and the heating source, and corresponding countermeasures (i.e., the suppression of thermal radiation, fabrication of high-temperature speckle pattern and mitigation of heat haze) are discussed in detail. Next, typical applications of high-temperature DIC at various spatial scales are briefly described. Finally, remaining unsolved problems and future goals in high-temperature deformation measurements using DIC are also provided. 

Conclusions

We expect this review can guide to build a suitable DIC system for kinematic field measurements at high temperatures and solve the challenging problems that may be encountered during real tests.

中文翻译：

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使用数字图像相关的高温变形测量概述

背景

过去十年来，数字图像相关技术（DIC）的发展使其成为一种实用且有效的光学技术，可用于高温下的位移和应变测量。

客观的

本概述旨在回顾研究进展，总结经验，并为使用DIC进行高温变形测量提供有价值的参考。

方法

我们全面总结了高温DIC技术的挑战和最新进展。

结果

首先简要介绍了高温DIC的基本原理以及产生热环境或施加热负荷的各种方法。然后，在执行高温DIC测量时提出了三个主要挑战，即1）。由加热的样品和周围加热元件的热​​辐射增强引起的图像饱和; 2）由于加热的样品的表面氧化和斑点图案脱粘而导致的图像对比度降低; 3）由于样品和加热源之间的热雾而导致的图像失真;并详细讨论了相应的对策（即抑制热辐射，制造高温斑点图案和​​减轻热雾）。接下来，简要描述高温DIC在各种空间尺度上的典型应用。最后， 

结论

我们希望这篇评论可以指导您建立适用于高温运动场测量的DIC系统，并解决实际测试中可能遇到的挑战性问题。