Abstract
Abstract We describe a time-averaging method for vibration analysis using white-light moire technique and video recording. Phase modulation is used to obtain information on both the vibration amplitude and the vibration phase. The vibration fringe function is discussed for projection gratings. A method which makes it possible to reveal the amplitude and phase distribution by use of a digital image-processing system and phase-stepping technique is described. The results of implementing the method are shown.
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