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Self-calibrating shape-measuring system based on fringe projection

: Kirschner, V.; Schreiber, W.; Notni, G.; Kowarschik, R.


Ahlers, R.-J. ; European Optical Society -EOS-; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Rapid prototyping and flexible manufacturing : 16 June 1997, Munich
Bellingham, Wash.: SPIE, 1997 (Europto series)
ISBN: 0-8194-2522-2
Conference "Rapid Prototyping and Flexible Manufacturing" <1997, München>
Fraunhofer IOF ()
coordinate-tripel; fringe projection; optical 3D-measurement; photogrammetric measurement

The goal of optical 3D-measurements is the determination of cartesian coordinates of surfaces. Using principles basing on fringe projection techniques coordinates are calculated of measured phase in fringes, image-coordinates of cameras and parameters of the system configuration. Mostly, three measured values unambiguous lead to one coordinate-tripel. A more comfortable way offer photogrammetric measurements where more than three values are measured to calculate coordinates and additional to parameters describing the system configuration. Applying these experiences to fringe projection techniques it is possible to combine the advantages of both techniques. That guarantees high number of object points, quick data acquirement and a simultaneous determination of coordinates and system parameters with photogrammetric bundle adjustment. Recent measurements showed the capabilities of that principle. The reliability of the coordinates is given by a standard deviation of less than 1 0 microns while the object diameter was up to 280 mm.