Optical moire leveraging analysis

Kevin G. Harding

doi:10.1117/12.198841

6 January 1994 Optical moire leveraging analysis

Kevin G. Harding

Proceedings Volume 2348, Imaging and Illumination for Metrology and Inspection; (1994) https://doi.org/10.1117/12.198841
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

The effect of optical moire as created by the interference of two grating patterns, is a proven means to extend the range of some structured light contouring methods. As has been used for years on glass scale encoders, the moire effect allows small displacements to be measured from lines well below the resolution limit of the camera system used to view the patterns. This paper will present an overview of how this effect can be used effectively. This analysis will include formulation of means to quantify the optical leverage effect of the moire for 3D contouring applications, and a quantitative comparison of resolution limits for moire versus straight structured light. The benefits and limitations of optical moire leveraging will be discussed for good and bad applications of the technique. Finally, the optical methods that can be employed to improve the images of moire patterns will be presented.

Citation Download Citation

Kevin G. Harding "Optical moire leveraging analysis", Proc. SPIE 2348, Imaging and Illumination for Metrology and Inspection, (6 January 1994); https://doi.org/10.1117/12.198841

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