Novel approach to estimate fringe order in Moire profilometry

Mahesh Kondiparthi

doi:10.1117/12.858620

14 May 2010 Novel approach to estimate fringe order in Moire profilometry

Mahesh Kondiparthi

Proceedings Volume 7690, Three-Dimensional Imaging, Visualization, and Display 2010 and Display Technologies and Applications for Defense, Security, and Avionics IV; 769014 (2010) https://doi.org/10.1117/12.858620
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

A novel approach to estimate fringe order in Moire topography is proposed. Along with the light source used to create shadow of the grating on the object (as in conventional moiré), proposed method uses a second light source which illuminates the object with color bands from the side. Width of each colored band is set to match that height which leads to a 2π phase shift in moiré fringes. This facilitates one to rule the object with colored bands, which can be used to estimate fringe order using a color camera with relatively low spatial resolution with out any compromise in height sensitivity. Current proposal facilitates one to extract 3D profile of objects with surface discontinuities. It also deals with the possible usage of moiré topography (when combined with the proposed method) in extracting 3D surface profile of many objects with height discontinuities using a single 2D image. Present article deals with theory and simulations of this novel side illumination based approach.

Citation Download Citation

Mahesh Kondiparthi "Novel approach to estimate fringe order in Moire profilometry", Proc. SPIE 7690, Three-Dimensional Imaging, Visualization, and Display 2010 and Display Technologies and Applications for Defense, Security, and Avionics IV, 769014 (14 May 2010); https://doi.org/10.1117/12.858620

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