In this paper a full-field measurement technique, namely fringe projection technique was implemented to determine the three-dimensional surface profile for situations where webs are opaque or translucent. In this method, a grating is projected to the surface of a web. The projected grating will be distorted due to the non-flat surface. The image of the distorted gratings will be shifted on a reference grating on a computer to form Moire fringes. The phase of the fringes is determined and converted to the surface profile of the web. Calibration was conducted, and validation was made on surfaces with known geometry. Surface profiles of Polyvinyl Fluoride (PVF), nonwoven and polyethylene webs, as well as non-flat side walls of a wound roll determined as examples illustrating the technique. The accuracy of the method is discussed. The method has potential for industrial scale applications due to its ease in setup and speed in three-dimensional reconstruction.Mechanical and Aerospace Engineerin
