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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 faster because several images are captured with shifting the grating phase. In this paper, we propose a phase-shifting scanning moire method using a DMD (Digital Micro-mirror Device), 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 in which each pixel has a shutter. The system and experimental results are shown to confirm the algorithm to obtain a contour image using the DMD camera.
日本実験力学会の論文