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3D measurement system on the basis of a tailored free-form mirror

: Zwick, Susanne; Heist, Stefan; Franzl, Yannick; Steinkopf, Ralf; Kühmstedt, Peter; Notni, Gunther


Furlong, Cosme ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Interferometry XVI: Applications : 13 - 16 August 2012, San Diego, California, United States
Bellingham, WA: SPIE, 2012 (SPIE Proceedings Series 8494)
ISBN: 978-0-8194-9211-1
Paper 84940F
Conference "Interferometry" <16, 2012, San Diego/Calif.>
Conference Paper
Fraunhofer IOF ()
fringe projection; UV; free-form optics; beam shaping

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 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.