1 January 1992 Three-dimensional contouring of diffuse objects using Talbot interferometry
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Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992); doi: 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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ramon Rodriguez-Vera, David Kerr, Fernando Mendoza Santoyo, "Three-dimensional contouring of diffuse objects using Talbot interferometry", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135291; https://doi.org/10.1117/12.135291
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KEYWORDS
Moire patterns

Laser interferometry

Interferometers

3D image processing

Collimation

Photography

Fringe analysis

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