Three-dimensional contouring of diffuse objects using Talbot interferometry

Ramon Rodriguez-Vera; David Kerr; Fernando Mendoza Santoyo

doi:10.1117/12.135291

1 January 1992 Three-dimensional contouring of diffuse objects using Talbot interferometry

Ramon Rodriguez-Vera, David Kerr, Fernando Mendoza Santoyo

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135291
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Two moire techniques are described which are based on Talbot projected fringes. They are applied to the study of three-dimensional contouring of diffuse targets for absolute shape measurement. One basic system relies on modulating the test target surface by projecting the Talbot image of a linear grating. A second grating, similar to that used for the Talbot image, is employed to obtain the demodulation or moire fringes. These fringes represent surface contours of equal depth. Using a phase measurement technique and digital image processing algorithms, the surface shape information is obtained from the contour maps. The technique is extended using a white light Talbot interferometer that produces a set of real color moire fringes. Each color represents a particular Talbot plane associated with a single wavelength. Subsequent interpretation of these colors allows the selection of a discrete set of contour planes, which suggests the possibility of profile measurement without using conventional fringe analysis techniques. Experimental results, merits and limitations of the systems are discussed.

Citation Download Citation

Ramon Rodriguez-Vera, David Kerr, and Fernando Mendoza Santoyo "Three-dimensional contouring of diffuse objects using Talbot interferometry", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135291

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