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30 September 2011 Phase-shifting fringe projection system using freeform optics
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Susanne Zwick, Peter Kühmstedt, and Gunther Notni "Phase-shifting fringe projection system using freeform optics", Proc. SPIE 8169, Optical Fabrication, Testing, and Metrology IV, 81690W (30 September 2011);


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