Three-dimensional displacement in multi-colored objects.

Three-dimensional displacement in multi-colored objects is measured by combining fringe projection (FP) and digital image correlation (DIC). Simultaneity of measurements through both techniques is warranted by encoding their signals on the RGB channels of color images. By separating the illuminating sources for each technique and by using ultraviolet light for DIC, contrast and amplitude of the registered signals are enhanced, enabling displacement measurement of multi-colored objects in dynamic events. The objects may even present a relatively large dynamic range of intensity levels. Proper selection of the light sources is supported by spectral analyses of the components of the system and by evaluation of the contrast of the registered images. Experimental results reveal that displacement measurements with relatively high accuracy can be obtained.