Abstract
Phase-shifting methods for analyzing phases of a grating projected onto an object are useful to measure the shape of the object accurately. Conventional phase-shifting methods usually uses three or four cosinusoidal phase-shifted images. The grating images are recorded with stopping phase-shifting so that the brightness does not change during the exposure time of the camera. The stopping procedure, however, obstructs speed up of the measurement system and it is difficult to produce a grating film which has an accurate cosinusoidal brightness distribution. In this paper, an integrated phase-shifting method (IPSM) using a Ronchi grating is proposed. This method is suitable for real-time phase analysis. The theory and an application for shape measurement of a deformed tire are shown.
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