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Robust, accurate, and improved measurement of structural deformation based on off-axis digital image correlation

QiHong Li, LingJia Liu, YongJun Zhou, Gang Li, and Yu Zhao

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Abstract

We propose a noncontact method for measuring structural deformation using off-axis digital image correlation. An efficient and high-precision algorithm that is insensitive to the accuracy of the initial guess is proposed and validated through numerical simulation. Image displacements in pixels are converted to physical displacements in millimeters using a calibration model based on a new method of measuring the objective distance. A new image-based structural deformation measurement system is proposed and validated using laboratory test results. The proposed method is easy to implement and accurate for structural deformation measurements.

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Data Availability

The data underlying the results presented in this paper are not publicly available at this time owing to an ongoing patent application but may be obtained from the authors upon reasonable request.

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