Topic
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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30 Jun 2010
TL;DR: A computer generated phase map and corresponding set of interference fringes calculated from a theoretical prescription of a measured aspheric surface comprises a Computer Generated Reference (CGR) that is used in an interferometer equipped with a spherical and/or flat reference element as discussed by the authors.
Abstract: A computer generated phase map and corresponding set of interference fringes calculated from a theoretical prescription of a measured aspheric surface comprises a Computer Generated Reference (CGR) that is used in an interferometer equipped with a spherical and/or flat reference element. moire fringes created between real interference fringes and the CGR describe the difference between the measured object and its prescription. The moire fringes can be nulled making the measurement of the aspheric surface analogous to the measurements of the regular spherical and/or flat surfaces.
3 citations
TL;DR: In this paper, a measurement method for the determination of three-degree-of-freedom (3-DOF) error motions is proposed based on non-diffracting Moire fringes produced by computer-generated holograms (CGHs).
Abstract: Aiming at the motion errors of the linear stage, a measurement method for the determination of three-degree-of-freedom (3-DOF) error motions is proposed based on non-diffracting Moire fringes produced by computer-generated holograms (CGHs). A liquid crystal spatial light modulator (SLM) is used to generate non-diffracting beams, and two non-diffracting beams form Moire fringes. A 3-DOF measuring optical path of non-diffracting Moire fringes is designed. Meanwhile, a 3-DOF mathematical model of motion errors is established, and three kinds of motion errors (yaw angle, roll angle and pitch angle) are separated by geometric analysis method. A rotary table is used to simulate the 3-DOF motion errors on different conditions. The NDB and non-diffracting Moire fringe patterns are obtained by CCD1 and CCD2 respectively. Experimental results show that the motion errors calculated by the positions of the central points agree well with the theoretical value with the error less than 0.0104°, which can verify the feasibility and correctness of the 3-DOF measurement system for non-diffracting Moire fringes.
3 citations
TL;DR: Based on the characteristics of evanescent wave moire fringes generated from subwavelength gratings, Wang et al. as discussed by the authors numerically investigated the contrast of moirefringes for two gratings with and without a silver slab.
Abstract: Based on the characteristics of evanescent wave moire fringes generated from subwavelength gratings, we numerically investigated the contrast of moire fringes for two gratings with and without a silver slab. The effect of the gratings' geometrical parameters on the contrast of moire fringes is analyzed in detail by using the finite-difference time domain method. Numerical results show that great enhancement of the contrast of evanescent wave moire fringes could be achieved by surface plasmon excitations on a silver slab. These evanescent wave moire fringes with high contrast will have potential applications in the nanofabrication field. (C) 2008 Optical Society of America.
3 citations
05 Aug 2015
TL;DR: This paper modified the model of Moiré which proposed by Amidror to evaluate the color moiré fringes, which considers the property of human vision system of contrast sensitivity and concludes that moirÉ minimization could have two lattice form an certain angle.
Abstract: Moire pattern can be readily observed in the case of superimposing two periodic structures. Recently, Moire pattern, which degrades the quality of an image, become unavoidable in many LED display and three-dimensional displays, which consist of regular structures. Therefore, a model of moire which fit the character of human vision is important to solve the problem of image quality degradation. In this paper, we modified the the model of Moire which proposed by Amidror to evaluate the color moire fringes, which consider the property of human vision system of contrast sensitivity. From the modified model we conclude that moire minimization could have two lattice form an certain angle. The experimental results show that moire pattern are vivid when the angle is 0°, 15°, 20° and 45°. However, the spatial frequency of Moire in 10°, 25°, 30° and 35° are fine in spatial domain. It is also reveal that changing angle is simple and effective in alleviating remarkably Moire pattern.
3 citations
TL;DR: An aperture system is described which executes a spectral scan for a Fabry-Perot spectrometer, and the results of a preliminary application described, and an indication of some possible applications given.
Abstract: An aperture system is described which executes a spectral scan for a Fabry-Perot spectrometer. Overlapping Fabry-Perot patterns produce straight-line moire fringes; hence, a linear ruling placed over a Fabry-Perot pattern generates a second, displaced Fabry-Perot pattern, consisting of segments of the rings of the first pattern. The segmented rings expand or contract as the ruling is moved past the mask. The result is a wavelength scan, and the system can therefore be used as a Fabry-Perot spectrometer. The theory is developed, the results of a preliminary application described, and an indication of some possible applications given.
3 citations