Experimental Mechanics

, Volume 30, Issue 1, pp 10-16

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

  • Z. L. Kahn-JetterAffiliated withMechanical Engineering Department, Manhattan College
  • , T. C. ChuAffiliated withDepartment of Mechanical and Industrial Engineering, Polytechnic University

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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.