A modified virtual point model of the 3D DIC technique using a single camera and a bi-prism

Three-dimensional (3D) digital image correlation (DIC) is an effective measurement method to obtain both 3D morphology and displacements of a target. The aim of this study was to investigate the 3D DIC technique using a single camera and a bi-prism so as to benefit from the high accuracy of measurements and the compatibility of the measurement system. A modified virtual point (MVP) model based on the analysis of light refraction in the prism using a backward ray-tracing method was proposed. As applications, the measurements of morphology and rigid-body translations of a cylindrical specimen and the deflection of a cantilever were conducted. The results show that the proposed method is capable of accurate determination of the 3D morphology and displacements. They also verify that the MVP model is feasible and that the designed bi-prism for the single-camera 3D DIC technique is reliable in morphology retrieval and displacement measurements.

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