Novel approach to estimate fringe order in Moire profilometry

Kondiparthi, Mahesh (2010) Novel approach to estimate fringe order in Moire profilometry. In: Proceedings of SPIE, 7690 .

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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 moire), 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 2 pi phase shift in moire 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 moire 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.

Item Type:	Journal Article
Publication:	Proceedings of SPIE
Series.:	Proceedings of SPIE-The International Society for Optical Engineering
Publisher:	The International Society for Optical Engineering.
Additional Information:	Copyright of this article belongs to The International Society for Optical Engineering.
Keywords:	moire topography; fringe order; surface discontinuities; phase unwrapping; color bands
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	01 Mar 2011 12:29
Last Modified:	07 Apr 2011 06:56
URI:	http://eprints.iisc.ac.in/id/eprint/35831

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