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Heatwave distortion correction using an improved reference sample compensation method and multispectral digital image correlation

机译：使用改进的参考样本补偿方法和多光谱数字图像相关性热波失真校正

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摘要

Heatwave distortions, caused by unevenly distributed temperature and refractive index in the optical path, unavoidably occur in high-temperature digital image correlation (DIC) measurement. To eliminate these distortions, a multispectral DIC-aided reference sample compensation method is proposed. The proposed method first adheres a correcting transparent glass (decorated with fluorescent speckle patterns) onto the test specimen (sprayed with red speckle patterns). Then, by illuminating the specimen with ultraviolet- and red-light sources, the blue light excited from the correcting glass and the red light reflected from the specimen surface can be captured by a 3CCD camera, forming a color image. After separating the recorded color images into red and blue subimages, the original and the correcting displacement fields can be calculated from these two sets of subimages using the subset-based local 2D-DIC algorithm. By point-to-point subtracting the correcting displacement fields from the original ones, the heatwave distortions can be eliminated, and the corrected real displacement fields can be obtained. For validation, static heatwave experiments show the feasibility and accuracy of the proposed method in correcting heatwave distortions. A uniaxial tensile test of an aluminum specimen with a central hole was also performed, further confirming the practicality of the proposed method in correcting heatwave distortions and revealing heatwave-hidden deformation. (C) 2021 Optical Society of America
机译：在高温数字图像相关（DIC）测量中，由于光路中的温度和折射率分布不均，不可避免地会产生热波畸变。为了消除这些失真，提出了一种多光谱DIC辅助参考样本补偿方法。所提出的方法首先将校正透明玻璃（装饰有荧光斑点图案）粘贴到试样上（喷涂有红色斑点图案）。然后，通过用紫外和红光光源照射试样，3CCD摄像机可以捕捉到从校正玻璃激发的蓝光和从试样表面反射的红光，形成彩色图像。在将记录的彩色图像分为红色和蓝色子图像后，可以使用基于子集的局部2D-DIC算法从这两组子图像中计算原始和校正位移场。通过对原始位移场进行点对点减去校正后的位移场，可以消除热波畸变，得到校正后的真实位移场。为了验证，静态热波实验表明了该方法在修正热波畸变方面的可行性和准确性。还对带有中心孔的铝试样进行了单轴拉伸试验，进一步证实了该方法在修正热波畸变和揭示热波隐藏变形方面的实用性。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第13期|共8页
  • 作者

    Zhang Xiaoying; Li Chenzhuo; Yu Liping; Pan Bing;

  • 作者单位

    Beihang Univ Sch Aeronaut Sci &

    Engn Inst Solid Mech Beijing 100191 Peoples R China;

    Beihang Univ Sch Aeronaut Sci &

    Engn Inst Solid Mech Beijing 100191 Peoples R China;

    Beihang Univ Sch Aeronaut Sci &

    Engn Inst Solid Mech Beijing 100191 Peoples R China;

    Beihang Univ Sch Aeronaut Sci &

    Engn Inst Solid Mech Beijing 100191 Peoples R China;

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  • 正文语种 eng
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