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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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Proceedings ArticleDOI
15 Oct 2012
TL;DR: In this paper, the relative position of wafer and mask can be calculated by information of Moire fringe during alignment, a maskless lithography alignment method based on circular gratings Moire fringes phase-shifting technique is proposed.
Abstract: The relative position of wafer and mask can be calculated by information of Moire fringe during alignment, a maskless lithography alignment method based on circular gratings Moire fringes phase-shifting technique is proposed in this paper. Circular grating Moire fringes have characteristics of measuring simultaneously angular displacement and line displacement. Location information of wafer in alignment can be real-time reflected in spatial phase of Moire fringes. A digital micromirror device controlled by a computer is used to generate phase-shifting grating labels, and phase-shifting Moire fringes will be formed by superposition of phase-shifting grating labels with grating label on the wafer. The position information of wafer can be abstained by phase analysis using Fourier transform method combined with phase-shifting technique,and gives feedback to the displacement stage to realize alignment. The theory basis of this method is emphatically introduced. Also, application of this method in maskless lithography alignment is analyzed in detail. Simulation results show that this method is high in accuracy, simple in operation and simple in algorithm. It provides a feasible method for lithography alignment technique.

1 citations

Journal ArticleDOI
15 Apr 2008
TL;DR: In this paper, a phase shift moire method was used to generate a 3D view of a plant shape from an optical moire pattern, which was then used for height determination.
Abstract: Plant architecture research subjects are of significant importance to genetics, photosynthesis, transpiration, crop-machine mechanical relationship, etc. In this sense, this research work had been carried in developing a new technique to generate the three dimensional view of plant shape. In this work the plant architecture determination will be carried out by means of a phase shift moire method. The importance of the proposed method is based on the application of a sequence of four grids out of phase by an angle of π/2 radians one from each other. A digital camera was employed to capture the moire patterns, which will generate the image to be processed. The procedure of image analysis involved softwares as Microsoft Powerpoint, Coreldraw and Idrisi. The use of a highly continuous sinusoidal grid, of a collimated light beam, of a higher resolution Charge Coupled Device Camera, as well as the superposition of image discontinuities during the unwrapping procedure included in the phase shifting method, avoided noise occurrence satisfactorily, improving image quality.The conception of tests leading to height determination to generate a topographic description of a plant model was conceived based on optical moire techniques. Obtained results reveal a great potential of the proposed method in determining plant architecture with high precision, at low cost and being not time demanding. Keywords: Moire; Interferometry, Plant Architecture.

1 citations

Proceedings ArticleDOI
05 Feb 1993
TL;DR: In this paper, an electronic XOR logic based method for obtaining 3D object contour moire fringes in real-time is presented, where rotation of equiorder surfaces is obtained by changing the period of projection grating.
Abstract: This paper reports the moire technique by means of electronic XOR logic for obtaining 3-D object contour moire fringes in real time. The main advantage of this method is removal of carrier frequency noise. In this method, the rotation of equiorder surfaces is obtained by changing the period of projection grating. Also, the slope contour fringes are obtained by moving the object in lateral. The projection system is used by means of a self-imaging Talbot effect. The details of equations and the experimental results are presented.

1 citations

Journal ArticleDOI
TL;DR: A technique for deriving the distortion equation of a lens system using moiré fringes is introduced, from which a correction factor equation is derived, making it unnecessary to use high quality lenses to make absolute measurements, as applicable to strain measuring instrumentation.
Abstract: A technique for deriving the distortion equation of a lens system using moire fringes is introduced, from which a correction factor equation is derived, making it unnecessary to use high quality lenses to make absolute measurements, as applicable to strain measuring instrumentation.

1 citations

Journal ArticleDOI
TL;DR: In this article , three typical types of 2D superlattices, including component, strain-induced and moiré, are reviewed, and the preparation methods, properties and state-of-the-art applications are summarized.
Abstract: As a combination concept of a 2D material and a superlattice, two-dimensional superlattices (2DSs) have attracted increasing attention recently. The natural advantages of 2D materials in their properties, dimension, diversity and compatibility, and their gradually improved technologies for preparation and device fabrication serve as solid foundations for the development of 2DSs. Compared with the existing 2D materials and even their heterostructures, 2DSs relate to more materials and elaborate architectures, leading to novel systems with more degrees of freedom to modulate material properties at the nanoscale. Here, three typical types of 2DSs, including the component, strain-induced and moiré superlattices, are reviewed. The preparation methods, properties and state-of-the-art applications of each type are summarized. An outlook of the challenges and future developments is also presented. We hope that this work can provide a reference for the development of 2DS-related research.

1 citations


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