Three-coordinate measuring system with structured light

Joerg Gerber; Peter Kuehmstedt; Richard M. Kowarschik; Gunther Notni; Wolfgang Schreiber

doi:10.1117/12.195521

30 November 1994 Three-coordinate measuring system with structured light

Joerg Gerber, Peter Kuehmstedt, Richard M. Kowarschik, Gunther Notni, Wolfgang Schreiber

Proceedings Volume 2342, Interferometry '94: Photomechanics; (1994) https://doi.org/10.1117/12.195521
Event: International Conference on Interferometry '94, 1994, Warsaw, Poland

Abstract

The measurement of three-dimensional object shapes plays an important role in machine vision, solid modeling and other industrial applications. Well known optical methods for 3D- shape inspection are moire-techniques and contouring. Unfortunately, as a rule they are lacking because they measure only one coordinate, i.e., the height above a reference surface. The other coordinates in the reference plane have to be determined using the pixel distance of the observing CCD-camera or by other means. Here, we demonstrate a real 3D-coordinate measuring system using fringe projection techniques where the scale of coordinates is given by the illumination-structures. This method has the advantage that the aberration of the observing system and the depth-dependent imaging scale have no influence on the measuring accuracy. Moreover, the measurements are independent of the position of the camera with respect to the object under test.

Citation Download Citation

Joerg Gerber, Peter Kuehmstedt, Richard M. Kowarschik, Gunther Notni, and Wolfgang Schreiber "Three-coordinate measuring system with structured light", Proc. SPIE 2342, Interferometry '94: Photomechanics, (30 November 1994); https://doi.org/10.1117/12.195521

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