Improving the spatial resolution of full-field vibration measurements for hollow structures using a speckle compensation calibration method in multi-camera DIC

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-04-11 DOI:10.1016/j.optcom.2025.131865

Yinhang Ma, Zhuoxuan Song, Yusheng Wang, Junnan Guan, Pengfei Zhu, Tengfei Zhang, Dong Jiang

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引用次数: 0

Abstract

This paper proposes a multi-pose speckle compensation calibration method to overcome the limitations of traditional multi-camera digital image correlation (DIC) systems, which heavily rely on large overlapping fields of view for external parameter calibration. Our method does not require auxiliary calibration equipment. By acquiring speckle images from multiple poses within the overlapping area, it can achieve precise coordinate unification even when the overlapping area is extremely small. The experiment conducted on ceramic plates verified the stitching accuracy of this method. The results show that, compared with the method based on the calibration plate, the errors of this method in the x, y, and z directions are all reduced by more than 50 %. A translation experiment on a hollow sailboard structure investigated the impact of different overlapping area selections on measurement accuracy. The results indicated that with only a two-pixel-wide overlap, the average error in static measurements could be controlled below 10 μm. In the dynamic hammering test of the sailboard, the deviation in natural frequency was less than 2 % compared to that measured by an eddy current sensor. This method optimizes the utilization of spatial resolution and is particularly effective for hollow structures with limited speckle coverage.

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传统的多相机数字图像相关（DIC）系统严重依赖大面积重叠视场进行外部参数校准，本文提出了一种多姿态斑点补偿校准方法，以克服这种方法的局限性。我们的方法不需要辅助校准设备。通过获取重叠区域内多个位置的斑点图像，即使重叠区域极小，也能实现精确的坐标统一。在陶瓷板上进行的实验验证了这种方法的拼接精度。结果表明，与基于校准板的方法相比，该方法在 x、y 和 z 方向上的误差都减少了 50% 以上。在空心帆板结构上进行的平移实验研究了不同重叠区域选择对测量精度的影响。结果表明，只需两个像素宽的重叠区域，静态测量的平均误差就能控制在 10 μm 以下。在帆板的动态锤击测试中，与涡流传感器测量的结果相比，固有频率的偏差小于 2%。这种方法优化了空间分辨率的利用，对于斑点覆盖范围有限的空心结构尤其有效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.