25 September 1997 White light heterodyne principle for 3D-measurement
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Proceedings Volume 3100, Sensors, Sensor Systems, and Sensor Data Processing; (1997); doi: 10.1117/12.287750
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany
Abstract
3D-measurement systems based on active triangulation using projection of structured light and recording by CCD-cameras are gaining more and more importance in industrial application. Their advantages compared to conventional coordinate measurement machines are the non-contact measurement and the fast acquisition of dense point clouds. This paper presents an alternative method to the well-known combination of Graycode and phase-shift projection. It will be shown how to use the heterodyne principle for overcoming the unwrapping problem of phase functions and for estimating the parameters for a reliable unwrapping procedure. The redundant phase information is used to increase the accuracy of the photogrammetrical 3D-coordinate determination. Finally, the heterodyne principle is used to realize on-line measurement based on color-coded fringe projection.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Carsten Reich, Reinhold Ritter, Jan Thesing, "White light heterodyne principle for 3D-measurement", Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); doi: 10.1117/12.287750; https://doi.org/10.1117/12.287750
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KEYWORDS
Heterodyning

Cameras

Fringe analysis

Phase shifts

Structured light

Imaging systems

Optical testing

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