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Phase-shifting fringe projection system using freeform optics

: Zwick, S.; Kühmstedt, P.; Notni, G.


Duparre, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical Fabrication, Testing, and Metrology IV : SPIE Optical System Design 2011, 5.-8.9.2011, Marseille, France
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 8169)
ISBN: 978-0-8194-8795-7
Paper 81690W
Conference "Optical Design and Engineering" <2011, Marseille>
Conference Paper
Fraunhofer IOF ()
fringe projection; UV; freeform optics; beam shaping

Phase-shifting fringe projection is one of the most effective methods for shape measurement. Conventional systems are based on a projector imaging fringes into the measurement plane. These systems are mainly limited to the spectral range of visible light, as projectors in UV- or IR-range suffer from technical problems. However, for certain applications these spectral ranges can be of interest. We introduce a novel fringe projector based on beamshaping using a freeform mirror. The fringes in the measurement plane are generated by redistributing light with the freeform mirror. This projection system is wavelength-independent and highly energy efficient, which makes it suitable for applications in UV and IR spectral ranges. Additionally, a measurement field with axially very large dimension can be realized. We present here the system design as well as system simulation results, that demonstrate the principle of our novel approach.