9 April 2014 Integrating fringe projection and digital image correlation for high-quality measurements of shape changes
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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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Luis Felipe-Sesé, Luis Felipe-Sesé, Philip Siegmann, Philip Siegmann, Francisco A. Díaz, Francisco A. Díaz, Eann A. Patterson, Eann A. Patterson, } "Integrating fringe projection and digital image correlation for high-quality measurements of shape changes," Optical Engineering 53(4), 044106 (9 April 2014). https://doi.org/10.1117/1.OE.53.4.044106 . Submission:
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