Abstract
Background
Digital image correlation (DIC) method is a non-interference and non-contact full-field optical measurement technology. DIC’s measurement accuracy is largely determined by the image acquisition system and the quality of the speckle pattern.
Objective
Although the optimal speckle pattern has been designed theoretically, the optimization process does not consider the influence of the imaging system. Furthermore, the optimal aperture has not been yield. The objective of this paper is to improve the measurement accuracy through optimization of aperture and speckle pattern.
Methods
In this paper, speckle images with different apertures and different speckle generation parameters were captured, and the corresponding measurement errors were evaluated.
Results
(1) The influence of aperture and the optimization of speckle are independent of each other. The optimal speckle generation parameters (speckle size and density) are determined experimentally, which turn out to be consistent with existing theoretical models. (2) The optimal aperture is 5.6, because excessively large F-number causes the loss of high-frequency information and excessively small F-number leads to significant lens aberrations, both of which will reduce the measurement accuracy.
Conclusions
The optimal aperture and speckle generation parameters (speckle diameter and density) are found and proved to be uncorrelated through actual experiments in practical conditions. These results provide experimental basis for the selection of parameters in actual engineering applications.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11627803, 11702287, 11872354), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB22040502), and the Fundamental Research Funds for the Central Universities (WK2480000004).
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The authors declare that they have no potential conflicts of interest. This article does not contain any studies with human participants or animals performed by any of the authors.
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Wang, Y., Gao, Y., Liu, Y. et al. Optimal Aperture and Digital Speckle Optimization in Digital Image Correlation. Exp Mech 61, 677–684 (2021). https://doi.org/10.1007/s11340-021-00694-w
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DOI: https://doi.org/10.1007/s11340-021-00694-w