Shape and displacement measurement by phase-shifting scanning moire method using digital micromirror device

Motoharu Fujigaki; Yoshiharu Morimoto; Qian Gao

doi:10.1117/12.468865

29 May 2002 Shape and displacement measurement by phase-shifting scanning moire method using digital micromirror device

Motoharu Fujigaki, Yoshiharu Morimoto, Qian Gao

Proceedings Volume 4537, Third International Conference on Experimental Mechanics; (2002) https://doi.org/10.1117/12.468865
Event: Third International Conference on Experimental Mechanics, 2002, Beijing, China

Abstract

Grating projection methods have been often used for non- contacting shape measurement. An image of equal-height contours of an object can be obtained in real-time using moire topography. We have developed the phase-shifting scanning moire method for real-time shape measurement with high resolution. But there is a problem that the measuring error becomes larger when the object is moving speedily because several images are captured while shifting the grating phase. In this paper, we propose a phase- shifting scanning moire method using a DMD, which can obtain an image of equal-height contours within a frame time. The direction of a ray reflected at each mirror of a DMD can be selected quickly. For this purpose, we developed a DMD reflection-type CCD camera called as 'DMD camera'. The camera works as a camera whose each pixel has a shutter. The structure and an experimental result to confirm the algorithm to obtain a contour image using het DMD camera are shown.

Citation Download Citation

Motoharu Fujigaki, Yoshiharu Morimoto, and Qian Gao "Shape and displacement measurement by phase-shifting scanning moire method using digital micromirror device", Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); https://doi.org/10.1117/12.468865

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