New approaches for phase determination

Jan Thesing

doi:10.1117/12.312930

30 June 1998 New approaches for phase determination

Jan Thesing

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312930
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Fringe projection and passive photogrammetry for measuring range to remote points are both based on triangulation. Applying the phase-shift technique to fringe projection, point clouds with high spatial resolution and limited accuracy can be generated. Because of the 1D phase information, the geometric sensor calibration is needed for object point determination. In photogrammetry, highly accurate image operators are applied in order to solve the problem of image correspondence for structures like circles, crosses or natural patterns with a limited spatial resolution. Based on the image point coordinates, object point determination can be performed as well as sensor calibrations. In this paper two approaches are presented to combine the advantages of both strategies. The image correspondence problem is solved by using projected fringes with different orientations. High spatial resolution is obtained by the phase-shifting technique. Systematical error sources like phase-shifting errors or nonsinusoidal waveforms will be eliminated by applying special algorithms in addition to a passive setup. Redundancy will be improved by increasing the number of sample points.

Citation Download Citation

Jan Thesing "New approaches for phase determination", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312930

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