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http://dx.doi.org/10.5762/KAIS.2011.12.6.2457

Application of DMD for Phase Shifting in Moire Topology  

Jeong, Kyung-Seok (School of Mechanical Engineering, Korea University of Technology & Education)
Jung, Yong-Sang (Department of Mechanical Engineering, Graduate School, Korea University of Technology & Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.12, no.6, 2011 , pp. 2457-2462 More about this Journal
Abstract
The need for rapid and accurate measurement of 3-dimensional objects is increasing due to the paradigmatic shift in manufacturing from mass production to small batch production. A three dimensional measurement technique which can provide the dimensional information of the object manufactured or to be manufactured has been developed. This method is based on phase shifting moire topology. Digital-Micromirror-Device (DMD) has been used in generating phase shifting moire fringes. And the mechanically moving optical components used for phase shifting, which might result in measurement errors, have been replaced by the DMD. Inherent $2\pi$-ambiguity problem, occurring in the calculation of phase from the light intensity distribution due to the nature of arctangent function, has been overcome by adapting the phase unwrapping method. The advantage of this technique is the easy change of the range and the resolution of the measurement by simply changing the computer generated grid pattern with the appropriate combination of projection lens of various focal length.
Keywords
3-D Topography; Phase shifting; Moire; Digital Micro-Mirror Device;
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