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Development of 3-D Digital Image Correlation Using a Single Color-Camera and Diffractive Speckle Projection

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Abstract

A method for performing three-dimensional (3-D) Digital Image Correlation (DIC) using a single color-camera is described. The method takes advantage of the three independent Red-Green-Blue (RGB) color signals available on a color-camera sensor to gain 3-D displacement information. Conventional two-dimensional (2-D) DIC of an applied surface pattern is recorded using the pixels of one color to obtain in-plane surface displacements. Out-of-plane displacements are measured using telecentric speckle projection, illuminated in a second color. Separate 2-D DIC measurements of the two color pattern images provide full-field 3-D displacement measurements. This approach significantly reduces the spatial computations compared to conventional dual-camera 3-D DIC. This single color-camera method is expanded upon to enable the technique to measure 3-D displacements of non-planar specimens. The technique provides sufficient additional information to enable independent measurement and correction of camera perspective errors. Results of rigid body displacements for a planar and cylindrical surface are presented as well as a complex 3-D deformation of a rubber sample.

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Acknowledgments

The authors sincerely thank the Natural Sciences and Engineering Research Council of Canada (NSERC) and American Stress Technologies, Inc. for their financial support of this research.

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Authors and Affiliations

  1. American Stress Technologies, Inc., Pittsburgh, PA, USA

    W. L. Gubbels

  2. University of British Columbia, Vancouver, Canada

    G. S. Schajer

Authors
  1. W. L. Gubbels
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  2. G. S. Schajer
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Correspondence to G. S. Schajer.

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Gubbels, W.L., Schajer, G.S. Development of 3-D Digital Image Correlation Using a Single Color-Camera and Diffractive Speckle Projection. Exp Mech 56, 1327–1337 (2016). https://doi.org/10.1007/s11340-016-0173-y

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  • DOI: https://doi.org/10.1007/s11340-016-0173-y

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