Track: Manufacturing and Design

Abstract

Fringe projection entails projecting a fringe pattern or grating on an object and viewing it from a different direction. It is a convenient technique for contouring objects that are too coarse to be measured with standard interferometry. Fringe projection is related to optical triangulation using a single point of light and light sectioning where a single line is projected onto an object and viewed in a different direction to determine the surface contour (Case et al. 1987). The fringe patterns are projected on to the object surface and the deformed grating image is captured by a CCD camera for subsequent analysis. Phase shifting techniques have been employed to determine the phase value. The phase variation is achieved by using a linear translation stage incorporated to the grating.  In this paper, the surface profile of objects for 3D printers is determined by using fringe pattern.