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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.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the Fourier transformation method was applied to digitally generated and real moire patterns, and the results showed that the proposed graphical analysis method is able to give high in-plane displacement accuracy with a mean error of −0.002mm and 0.451° in the eccentricity magnitude and direction, respectively.

14 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a method for the detection of defects based on a comparison of the responses of two macroscopically identical specimens. But the method is contactless and is not suitable for non-destructive quality assessment of mechanical parts.
Abstract: The development of comparative holographic moire interferometry is accelerated by the need for nondestructive testing. This paper describes a holographic moire technique for the detection of defects that is based on a comparison of the responses of two macroscopically identical specimens. At identical loading of the master and test objects, the moire fringes obtained are areas of equal differences in the mechanical responses, and they form closed curves around the defect. The schemes of additive and multiplicative moire are studied experimentally, and their advantages and disadvantages are discussed. Comparison of the suggested technique with conventional holographic interferometry shows its reliability for localizing defects. The comparative method is contactless and is especially appropriate for nondestructive quality assessment of mechanical parts.

14 citations

Patent
26 Jan 2001
TL;DR: An apparatus and method for wavefront sensing that includes employing two moire gratings in an optical path, optically Fourier transforming a moire deflectogram produced by the gratings, variably transmitting the transformed moire deflectionogram, and receiving an image of the variably transmitted and transformed deflection is described in this paper.
Abstract: An apparatus and method for wavefront sensing that includes: employing two moire gratings in an optical path; optically Fourier transforming a moire deflectogram produced by the gratings; variably transmitting the transformed moire deflectogram; and receiving an image of the variably transmitted and transformed moire deflectogram. The variable transmission is best accomplished by transmission filter, a transmissive optic encoding intensity information upon the moire deflectogram as a function of fringe angle. For example, the function can be a triangular transmission function centered on the (0,0) order spatial frequency spot and oriented at 45 degrees to the y-axis. The optical Fourier transform is accomplished by a lens and the variable transmission by an apodized slit.

14 citations

Journal ArticleDOI
TL;DR: A new method based on pseudo-Wigner-Hough transform is proposed for the simultaneous measurement of the in-plane and out-of-plane displacements using digital holographic moiré to demonstrate its efficacy and its robustness against the variations in object beam intensity.
Abstract: A new method based on pseudo-Wigner-Hough transform is proposed for the simultaneous measurement of the in-plane and out-of-plane displacements using digital holographic moire. Multiple interference phases corresponding to the in-plane and out-of-plane displacement components are retrieved from a single moire fringe pattern. The segmentation of the interference field allows us to approximate it with a multicomponent linear frequency modulated signal. The proposed method accurately and simultaneously estimates all the phase parameters of the signal components without the use of any signal separation techniques. Simulation and experimental results demonstrate the efficacy of the proposed method and its robustness against the variations in object beam intensity.

14 citations

Journal ArticleDOI
TL;DR: Digital in-line holography is widely used in flow studies where the 3D position, size and velocity of particles or fibers have to be known at a given time.
Abstract: Digital in-line holography is widely used in flow studies where the 3D position, size and velocity of particles or fibers has to be known at a given time. When holograms are recorded by using a sub-picosecond laser, the enlargement of the spectral distribution acts as a spatial low-pass filter over the intensity distribution of the diffraction pattern. This is not a disadvantage as regards to the spatial sampling. Indeed, the Moire effect, due to the sub-sampling of the fringe pattern is naturally reduced. Experimental results are provided.

14 citations


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