On Using Off-the-Shelf Micro Projectors for 3D Metrology

Modern projectors offer sufficient light intensity, contrast and resolution to perform highly accurate 3D measurements on a large variety of surfaces by projecting coded patterns observed by cameras. Yet, for mobile measurement systems or inspections of specimen which are hard to reach, common projecting devices are often too heavy and too bulky. Recently, a new projection technology has emerged, employing a reflecting Liquid Crystal Display (LCD) panel called Liquid Cristal on Silicon (LCoS) which allows to build small and light micro projectors. These new devices have a low power consumption and are comparatively cheap. Since no previous experience with these devices for metrology applications is available, an off-the-shelf micro projector is evaluated regarding its capability in a structured light setup.