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Optical Engineering

High-speed three-dimensional measurements with a fringe projection-based optical sensor
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Paper Abstract

An optical three-dimensional (3-D) sensor based on a fringe projection technique that realizes the acquisition of the surface geometry of small objects was developed for highly resolved and ultrafast measurements. It realizes a data acquisition rate up to 60 high-resolution 3-D datasets per second. The high measurement velocity was achieved by consequent fringe code reduction and parallel data processing. The reduction of the length of the fringe image sequence was obtained by omission of the Gray code sequence using the geometric restrictions of the measurement objects and the geometric constraints of the sensor arrangement. The sensor covers three different measurement fields between 20  mm×20  mm and 40  mm×40  mm with a spatial resolution between 10 and 20 μm, respectively. In order to obtain a robust and fast recalibration of the sensor after change of the measurement field, a calibration procedure based on single shot analysis of a special test object was applied which works with low effort and time. The sensor may be used, e.g., for quality inspection of conductor boards or plugs in real-time industrial applications.

Paper Details

Date Published: 6 June 2014
PDF: 8 pages
Opt. Eng. 53(11) 112213 doi: 10.1117/1.OE.53.11.112213
Published in: Optical Engineering Volume 53, Issue 11
Show Author Affiliations
Christian Bräuer-Burchardt, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Andreas Breitbarth, 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)

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