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Proceedings Paper

3D measurement system on the basis of a tailored free-form mirror
Author(s): Susanne Zwick; Stefan Heist; Yannick Franzl; Ralf Steinkopf; Peter Kühmstedt; Gunther Notni
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Paper Abstract

Phase-shifting fringe projection is an effective method for 3D-shape measurements. Conventional fringe projection systems utilize a digital projector that images fringes into the measurement plane. The performance of such systems is limited to the visible spectral range, as most projectors experience technical limitations in UV or IR spectral ranges. However, for certain applications these spectral ranges are of special interest. A novel fringe projector was developed on the basis of a single tailored free-form mirror. The freeform mirror generates a sinusoidal fringe pattern by redistribution of light. Phase-shifting can be realized by a slight rotation of the free-form mirror. In this system, the fringe pattern is generated by illuminating the free-form surface and not by the classical imaging technique. As the system is based on a single mirror, it is wavelength independent in a wide spectral range and therefore applicable in UV and IR spectral ranges. Additionally it does not feature any chromatic aberrations. We present the design and realization of this novel fringe projection system. The tailored freeform mirror is realized using ultra-precision turning. Experimental results demonstrate the functionality of the novel measurement system in VIS and UV spectral range.

Paper Details

Date Published: 25 September 2012
PDF: 9 pages
Proc. SPIE 8494, Interferometry XVI: Applications, 84940F (25 September 2012); doi: 10.1117/12.928577
Show Author Affiliations
Susanne Zwick, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Stefan Heist, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Yannick Franzl, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Ralf Steinkopf, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Peter Kühmstedt, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Gunther Notni, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)


Published in SPIE Proceedings Vol. 8494:
Interferometry XVI: Applications
Cosme Furlong; Christophe Gorecki; Erik L. Novak, Editor(s)

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