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Optical Engineering

Integrating fringe projection and digital image correlation for high-quality measurements of shape changes
Author(s): Luis Felipe-Sesé; Philip Siegmann; Francisco A. Díaz; Eann A. Patterson
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Paper Abstract

An approach for the measurement of surface displacement fields in three dimensions is presented based on the combination of two-dimensional digital image correlation with fringe projection. Only a single RGB image is required at each deformation state, thereby allowing real-time data acquisition, which is achieved using red speckle and projected blue fringes that are captured in the single image and separated using a Bayer filter. The approach allows both a perpendicular alignment relative to a flat reference surface and self-calibration, i.e., no calibration object is employed. The minimum measurement uncertainty of such a system is found to be 0.0083±0.00239 and 0.0238±0.0068 mm, respectively, for the in-plane and out-of-plane displacements. The potential of the approach is demonstrated for an elastic membrane undergoing large (5 to 20 mm) applied out-of-plane displacements, and the results show no significant difference (<1%) in the measured in-plane displacement fields compared with a commercially available system for stereoscopic digital image correlation.

Paper Details

Date Published: 9 April 2014
PDF: 9 pages
Opt. Eng. 53(4) 044106 doi: 10.1117/1.OE.53.4.044106
Published in: Optical Engineering Volume 53, Issue 4
Show Author Affiliations
Luis Felipe-Sesé, Univ. de Jaén (Spain)
Philip Siegmann, Univ. de Alcalá (Spain)
Francisco A. Díaz, Univ. de Jaén (Spain)
Eann A. Patterson, Univ. of Liverpool (United Kingdom)

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