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Moiré pattern

About: Moiré pattern is a research topic. Over the lifetime, 1917 publications have been published within this topic receiving 27176 citations. The topic is also known as: moiré fringes & moire pattern.


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Patent
D Duffy1
12 Jan 1972
TL;DR: In this paper, a method and apparatus for sensing surface displacement of an object orthogonal to the line of sight is described, where the object is illuminated from a single laser source and imaged by a common lens using two laterally displaced apertures.
Abstract: A novel method and apparatus for sensing surface displacement of an object orthogonal to the line of sight is described. The object is illuminated from a single laser source and imaged by a common lens using two laterally displaced apertures. Two successive images are obtained in this manner and are superimposed. The displacement is displayed as a pattern of moire'' fringes or bands over the image. Increasing the moire'' contrast is achieved by spatial filtering. The invention has application to measuring object displacement or distortion under both static and vibratory conditions.

12 citations

Journal ArticleDOI
TL;DR: In this paper, the sampling moire method is used to analyze phases of a moire fringe and a grating from one image of one grating pattern, it is possible to analyze dynamic deformation accurately.
Abstract: Moire method is a useful method to measure deformation and strain distribution of structures. Moire fringe patterns are analyzed quantitatively and speedy by image processing using a computer. In this paper, the theory of moire method and sampling moire method is introduced. Since the sampling moire method is useful to analyze phases of a moire fringe and a grating from one image of a grating pattern, it is possible to analyze dynamic deformation accurately. Some applications of the sampling moire method to displacement measurement of a beam, and shape and strain measurement of a rubber structure are shown.

12 citations

Journal ArticleDOI
TL;DR: In this article, the authors used the phase shift method to determine the surfaces three-dimensional shape using isothamic fringe patterns and digital image processing, and applied it to images obtained by simulation for error evaluation.
Abstract: The Shadow Moire fringe patterns are level lines of equal depth generated by interference between a master grid and its shadow projected on the surface. In simplistic approach, the minimum error is about the order of the master grid pitch, that is, always larger than 0,1 mm, resulting in an experimental technique of low precision. The use of a phase shift increases the accuracy of the Shadow Moire technique. The current work uses the phase shifting method to determine the surfaces three-dimensional shape using isothamic fringe patterns and digital image processing. The current study presents the method and applies it to images obtained by simulation for error evaluation, as well as to a buckled plate, obtaining excellent results. The method hands itself particularly useful to decrease the errors in the interpretation of the Moire fringes that can adversely affect the calculations of displacements in pieces containing many concave and convex regions in relatively small areas.

12 citations

Journal ArticleDOI
TL;DR: New methods of optical differentiation of fringe patterns obtained by the moire interferometry method provide spatial derivatives of in-plane and out-of-plane displacements of the specimen under load in the form of moire or two-beam interference fringes.
Abstract: New methods of optical differentiation of fringe patterns obtained by the moire interferometry method are presented. They provide spatial derivatives of in-plane and out-of-plane displacements of the specimen under load in the form of moire or two-beam interference fringes. Either the uniform or finite fringe detection mode can be used. Simulation experiments using specially prepared transmission-type gratings are given to verify the principles.

12 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023181
2022321
202126
202048
201946
201844