title: 3D phase-shifting fringe projection system on the basis of a tailored free-form mirror.
abstract: Phase-shifting fringe projection is an effective method to perform 3D shape measurements. Conventionally, 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. We present a wideband fringe projector that has been developed on the basis of a picture generating beamshaping mirror. This mirror generates a sinusoidal fringe pattern in the measurement plane without any additional optical elements. Phase shifting is realized without any mechanical movement by a multichip LED. 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. We present the design and a realized setup of this fringe projection system and the characterization of the generated intensity distribution. Experimental results of 3D shape measurements are presented.
authors.affiliation: Fraunhofer IOF, Albert-Einstein-Str. 7, Jena 07745, Germany.
authors.forename: Susanne
authors.initials: S
authors.lastname: Zwick
authors.forename: Stefan
authors.initials: S
authors.lastname: Heist
authors.forename: Ralf
authors.initials: R
authors.lastname: Steinkopf
authors.forename: Sandra
authors.initials: S
authors.lastname: Huber
authors.forename: Sylvio
authors.initials: S
authors.lastname: Krause
authors.forename: Christian
authors.initials: C
authors.lastname: Bräuer-Burchardt
authors.forename: Peter
authors.initials: P
authors.lastname: Kühmstedt
authors.forename: Gunther
authors.initials: G
authors.lastname: Notni