3-D deformation measurement using fringe projection and digital image correlation

Abstract

In this study, we propose an integrated method which combines fringe projection and digital image correlation (DIC) method into one optical system for 3-dimensional displacement measurement. Sinusoidal fringes are projected on an object using a liquid crystal display (LCD) fringe projector. Two sets of images, one containing projected fringes and the other with only white light speckle background, are captured by a CCD camera and processed using DIC to obtain in-plane displacement. Fourier transform is also employed to evaluate the images for out-of-plane displacement. Experimental results are compared with analytic solutions and the results demonstrate that both in-plane and out-ofplane displacements can be accurately measured using the proposed method.