Fringe Projection in Engineering Applications for Optical Metrology

Non-contact geometric Measurement techniques which are based on optical fringe projection have developed into a broad variety of engineering applications during the last two decades. Measurement volumes range from several ten micrometers up to several meters. Complex object surface scattering due to the interaction between considerably different light sources (narrow to wide band, coherent to non-coherent, etc.) and highly distinctive surface characteristics (roughness, discontinuities, gradient dependent,..) have been under intensive scientific investigations and lead finally to a systematic approach in setting up appropriate measuring devices. This holds for accessible and hard-to-access measurement surfaces as well. Depending on different measurement tasks, this presentation tries to compile different fringe projection methods (conventional, inverse, virtual, microscopic, depth scanning, endoscopic,…) in correlation to its applications. In that sense, it might be also seen as a survey and guideline to users, experienced and unexperienced as well.