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Three-dimensional displacement measurements using digital image correlation and photogrammic analysis

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Abstract

The application of digital image correlation and stereoscopic principles is used to determine three-dimensional displacements. Two pairs of stereo images of a speckled surface before and after deformation are digitized and correlated to determine the three-dimensional displacements. The images are interpolated so as to account for subpixel displacements. A sequential decision technique and a coarsefine search are employed to increase computer efficiency and decrease run time. Very accurate results are obtained, expecially when the magnification is increased. The effect of camera tilt is shown to be negligible. Theory and experimental verification are presented.

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Authors and Affiliations

  1. Mechanical Engineering Department, Manhattan College, Manhattan College Parkway, 10471, Riverdale, NY

    Z. L. Kahn-Jetter (SEM Member) is Assistant Professor of Mechanical Engineering)

  2. Department of Mechanical and Industrial Engineering, Polytechnic University, 11202, Brooklyn, NY

    T. C. Chu (SEM Member) is Assistant Professor of Mechanical Engineering)

Authors
  1. Z. L. Kahn-Jetter
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  2. T. C. Chu
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Kahn-Jetter, Z.L., Chu, T.C. Three-dimensional displacement measurements using digital image correlation and photogrammic analysis. Experimental Mechanics 30, 10–16 (1990). https://doi.org/10.1007/BF02322695

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  • DOI: https://doi.org/10.1007/BF02322695

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