Abstract
Sampling moiré method is a newly developed moiré method using an image processor for a grating pattern to measure shape or displacement or strain distributions. A grating pattern on an object is recorded by a digital camera. Though the digitized image shows the grating, a moiré fringe pattern appears by thinning-out the pixels, i.e., sampling the image with a larger pitch than the pixel pitch. If the sampling pitch is changed, the moiré pattern is changed very much. If the phase of the sampling is changed, the phase of the moiré pattern is changed. The phase analysis of moiré pattern provides accurate result of displacement of the grating. If the number of the phase-shifted moiré patterns i.e. the number of pixels for a pitch of grating is larger, the resolution of phase analysis becomes more accurate but the spatial resolution becomes worse. Since the sampling moiré method is useful to analyze the phases of a moiré fringe and a grating from one image of a grating pattern, it is possible to analyze dynamic deformation accurately.
In this paper, the theory of the sampling moiré method is introduced and some applications of the sampling moiré method to displacement measurement of a beam, and shape and strain measurement of a rubber structure are shown.
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Morimoto, Y., Fujigaki, M. (2011). Theory and Application of Sampling Moiré Method. In: Kounadis, A.N., Gdoutos, E.E. (eds) Recent Advances in Mechanics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0557-9_13
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DOI: https://doi.org/10.1007/978-94-007-0557-9_13
Publisher Name: Springer, Dordrecht
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