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Yongxin Chen

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Proceedings Article | 8 July 2022 Paper

Preliminary research on calibration method of digital image correlation measurement system

Yong-xin Chen, Xiaochuan Gan, Xuejun He, Anbin Sun

Proceedings Volume 12282, 122821G (2022) https://doi.org/10.1117/12.2616572

KEYWORDS: Digital image correlation, Speckle, Calibration, Speckle pattern, Digital imaging, Image processing, Computer simulations, Interferometers, Digital image processing, Image quality, Metrology

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Digital image correlation method, also known as digital speckle correlation method, is a non-contact optical measurement method based on modern computer technology and optical principle. The main purpose is to study the displacement and strain of the measured object. The digital image correlation method has the characteristics of full field, real-time, non-contact, high measurement accuracy and fast response speed, and has developed rapidly in recent years. At present, the composition and principle of typical digital image correlation systems have been basically agreed, but there is no more feasible and effective method for the calibration of displacement measurement systems based on digital image correlation technology. This paper first analyzed the factors affecting the accuracy of the system, among which the speckle image is an important information source affecting the calculation results of the digital image correlation system. Therefore, we generated the simulated speckle image by writing the program and simulated the displacement, and used the software of the measurement system to calculate the simulated displacement. Then, a verification experiment was designed to prove the effectiveness of using the speckle image to complete the calibration. We built a set of calibration experiment equipment, using the laser interferometer with the characteristics of high measurement accuracy and small numerical limit of the measurement displacement and the printed speckle target points to complete the calibration process. Finally, we completed the experiment and carried out the precision analysis, and realized the preliminary research on the calibration method of the digital image correlation measurement system.

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