Готові списки джерел за темами / Effet moiré

Добірка наукової літератури з теми "Effet moiré"

Автор: Grafiati
Опубліковано: 7 липня 2024
Оновлено: 7 липня 2024

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  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій

Статті в журналах з теми "Effet moiré":

1

Yi, Xue Feng, and Si Chun Long. "Precision Displacement Measurement of Single Lens Reflex Digital Camera." Applied Mechanics and Materials 103 (September 2011): 82–86. http://dx.doi.org/10.4028/www.scientific.net/amm.103.82.

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When the stripes are photographed by digital cameras,Moiré fringes will be in the photograph. With the displacement amplification of Moiré fringes, tiny movement of stripes can be calculated precisely. We expounded its calculating methods in this paper. Experimental data show that high precision can be guaranteed.It is well known that the high rate zoom characteristic of moire fringe technique can be well used in precise measurement of digital Camera’s displacement, and besides, widely used in machining, laboratory and photo-electricity equipment. With the development and popularization of digital cameras, especially the great advancement in image sensor’s performance, it now becomes possible to accurately measure the displacement from far away by taking into account the sensor’s moire effect.
2

Spillmann, Lothar. "The Perception of Movement and Depth in Moiré Patterns." Perception 22, no. 3 (March 1993): 287–308. http://dx.doi.org/10.1068/p220287.

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Moiré patterns can produce striking movement effects and in more complex stimuli can induce vivid stereoscopic depth. The physical rules underlying these phenomena are reviewed and their relationship to psychophysics is discussed. First, it is shown how moirés in ‘optical line interference’ patterns are created by superimposing periodic visual stimuli, eg gratings, and shifting them relative to each other. When two gratings are presented in this manner, small differences in spatial frequency, orientation, and speed are magnified. This magnification has prompted the use of moiré patterns both in industry and in art where their enhanced sensitivity to misalignment and spatial distortion has been widely exploited. Next, it is demonstrated how enhanced depth in ‘stereoscopic interference’ patterns is produced by presenting grating stimuli in two (or more) depth planes. The perceived depth effect in the resulting moiré pattern can be elicited similarly by binocular disparity and motion parallax. Finally, it is described how perceived movements occurring in different directions and at different depths are the basis for the perceptual ‘irritations’ that fascinate observers in complex moiré patterns. The use of moirés for the noninvasive examination of the human retina by aliasing is discussed.
3

Fung, Kai-hung. "Creating Special Visual Effects with Moiré Patterns in Stereoscopic 3D and 4D Computed Tomographic Art." Leonardo 43, no. 3 (June 2010): 306–7. http://dx.doi.org/10.1162/leon.2010.43.3.306.

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Moiré pattern refers to an interference pattern that is observed when two sets of grid lines overlay one another. With special 3D rendering technique such as the “Rainbow Technique” for tomographic art generated from computed tomography (CT), the Moiré pattern can be utilized for its aesthetic effect, particularly in stereoscopic motion images to create a special visual effect. The use of the Moire pattern is featured in my piece Deep Within in the new media art exhibition “Digit@logue” curated by Ellen Pau held in Hong Kong Museum of Art in 2008.
4

Gao, Yuan, Pengfei Li, Fan Gong, Sihong Zhai, Chaohao Wang, and Lei Zhao. "P‐3.5: Research on Reducing Moiré Patterns in Naked‐eye 3D Displays through Optimizing Lenticular Lens Tilt Angle." SID Symposium Digest of Technical Papers 55, S1 (April 2024): 729–33. http://dx.doi.org/10.1002/sdtp.17188.

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In the domain of Naked‐eye 3D display technology, the periodic interference between lenticular lens and screen subpixels frequently results in the generation of moiré patterns, which significantly impair image quality. This study proposes a strategy to reduce moir é artifacts by adjusting the tilt angle of the lenticular lens. Relying on the human eye sensitivity function, we have conducted a thorough analysis of the moiré patterns caused by the interference between the lenticular lens and the screen at various tilt angles. After extensive research, it has been discovered that the analytical method which applies spectral sensitivity weighting subsequent to the consideration of the human eye sensitivity function aligns more closely with the actual perception of moiré patterns by the human eye. This approach enables a more precise determination of the optimal tilt angles for lenticular lenses and screens, thereby substantially minimizing the moiré effect. The implications of this finding are significant for the realization of high‐quality, high‐definition naked‐eye 3D image displays, and may positively contribute to advancements within this technical field.
5

Yu, Hongyi, Mingxing Chen, and Wang Yao. "Giant magnetic field from moiré induced Berry phase in homobilayer semiconductors." National Science Review 7, no. 1 (August 13, 2019): 12–20. http://dx.doi.org/10.1093/nsr/nwz117.

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Abstract When quasiparticles move in condensed matters, the texture of their internal quantum structure as a function of position and momentum can give rise to Berry phases that have profound effects on the material’s properties. Seminal examples include the anomalous Hall and spin Hall effects from the momentum-space Berry phases in homogeneous crystals. Here, we explore a conjugate form of the electron Berry phase arising from the moiré pattern: the texture of atomic configurations in real space. In homobilayer transition metal dichalcogenides, we show that the real-space Berry phase from moiré patterns manifests as a periodic magnetic field with magnitudes of up to hundreds of Tesla. This quantity distinguishes moiré patterns from different origins, which can have an identical potential landscape, but opposite quantized magnetic flux per supercell. For low-energy carriers, the homobilayer moirés realize topological flux lattices for the quantum-spin Hall effect. An interlayer bias can continuously tune the spatial profile of the moiré magnetic field, whereas the flux per supercell is a topological quantity that can only have a quantized jump observable at a moderate bias. We also reveal the important role of the non-Abelian Berry phase in shaping the energy landscape in small moiré patterns. Our work points to new possibilities to access ultra-high magnetic fields that can be tailored to the nanoscale by electrical and mechanical controls.
6

Yao, Li Li, Hai Bo Shi, Chang Liu, and Zhong Hua Han. "Solving the Two-Objective Shop Scheduling Problem in MTO Manufacturing Systems by a Novel Genetic Algorithm." Advanced Materials Research 314-316 (August 2011): 1315–20. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1315.

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With the characteristics of un-touching, high-automatic and high-speed, we measured 3D shape by digital moiré patterns. And it can measure 3D shape without compensator, auxiliary mirror, hologram and other assistant modules. So it is widely used in measurement of 3D shape. But with the negative effect of grating area and CCD resolution of the camera, it has some problems in large aperture, steep aspheric surface, even off-axis aspheric testing. Focus on these problems; this paper established a sub-region splicing measurement of aspheric surface by using the combination of digital moire patterns and digital phase shifting technology. This paper also illustrated the basic theory, and the mathematical implementation procedure. In all, sub-region splicing digital moiré patterns can be considered as another method, which beyond compensation tests to measurement of aspheric surface.
7

Wang, Shaofeng, Jizhe Song, Mengtao Sun, and Shuo Cao. "Emerging Characteristics and Properties of Moiré Materials." Nanomaterials 13, no. 21 (October 30, 2023): 2881. http://dx.doi.org/10.3390/nano13212881.

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In recent years, scientists have conducted extensive research on Moiré materials and have discovered some compelling properties. The Moiré superlattice allows superconductivity through flat-band and strong correlation effects. The presence of flat bands causes the Moiré material to exhibit topological properties as well. Modulating electronic interactions with magnetic fields in Moiré materials enables the fractional quantum Hall effect. In addition, Moiré materials have ferromagnetic and antiferromagnetic properties. By tuning the interlayer coupling and spin interactions of the Moiré superlattice, different magnetic properties can be achieved. Finally, this review also discusses the applications of Moiré materials in the fields of photocurrent, superconductivity, and thermoelectricity. Overall, Moiré superlattices provide a new dimension in the development of two-dimensional materials.
8

Yoshimura, Jun-ichi. "Theoretical study of the properties of X-ray diffraction moiré fringes. I." Acta Crystallographica Section A Foundations and Advances 71, no. 4 (May 14, 2015): 368–81. http://dx.doi.org/10.1107/s2053273315004970.

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A detailed and comprehensive theoretical description of X-ray diffraction moiré fringes for a bicrystal specimen is given on the basis of a calculation by plane-wave dynamical diffraction theory. Firstly, prior to discussing the main subject of the paper, a previous article [Yoshimura (1997).Acta Cryst.A53, 810–812] on the two-dimensionality of diffraction moiré patterns is restated on a thorough calculation of the moiré interference phase. Then, the properties of moiré fringes derived from the above theory are explained for the case of a plane-wave diffraction image, where the significant effect ofPendellösungintensity oscillation on the moiré pattern when the crystal is strained is described in detail with theoretically simulated moiré images. Although such plane-wave moiré images are not widely observed in a nearly pure form, knowledge of their properties is essential for the understanding of diffraction moiré fringes in general.
9

Li, Zhenyao, Jia-Min Lai, and Jun Zhang. "Review of phonons in moiré superlattices." Journal of Semiconductors 44, no. 1 (January 1, 2023): 011902. http://dx.doi.org/10.1088/1674-4926/44/1/011902.

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Abstract Moiré patterns in physics are interference fringes produced when a periodic template is stacked on another similar one with different displacement and twist angles. The phonon in two-dimensional (2D) material affected by moiré patterns in the lattice shows various novel physical phenomena, such as frequency shift, different linewidth, and mediation to the superconductivity. This review gives a brief overview of phonons in 2D moiré superlattice. First, we introduce the theory of the moiré phonon modes based on a continuum approach using the elastic theory and discuss the effect of the moiré pattern on phonons in 2D materials such as graphene and MoS2. Then, we discuss the electron–phonon coupling (EPC) modulated by moiré patterns, which can be detected by the spectroscopy methods. Furthermore, the phonon-mediated unconventional superconductivity in 2D moiré superlattice is introduced. The theory of phonon-mediated superconductivity in moiré superlattice sets up a general framework, which promises to predict the response of superconductivity to various perturbations, such as disorder, magnetic field, and electric displacement field.
10

Yoshimura, Jun-ichi. "Theoretical study of the properties of X-ray diffraction moiré fringes. II. Illustration of angularly integrated moiré images." Acta Crystallographica Section A Foundations and Advances 75, no. 4 (June 26, 2019): 610–23. http://dx.doi.org/10.1107/s2053273319004601.

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Using a theory of X-ray diffraction moiré fringes developed in a previous paper, labelled Part I [Yoshimura (2015). Acta Cryst. A71, 368–381], the X-ray moiré images of a silicon bicrystal having a weak curvature strain and an interspacing gap, assumed to be integrated for an incident-wave angular width, are simulation-computed over a wide range of crystal thicknesses and incident-wave angular width, likely under practical experimental conditions. Along with the simulated moiré images, the graphs of characteristic quantities on the moiré images are presented for a full understanding of them. The treated moiré images are all of rotation moiré. Mo Kα1 radiation and the 220 reflection were assumed in the simulation. The results of this simulation show that fringe patterns, which are significantly modified from simple straight fringes of rotation moiré, appear in some ranges of crystal thicknesses and incident-wave angular width, due to a combined effect of Pendellösung oscillation and an added phase difference from the interspacing gap, under the presence of a curvature strain. The moiré fringes which slope to the perpendicular direction to the diffraction vector in spite of the assumed condition of rotation moiré, and fringe patterns where low-contrast bands are produced with a sharp bend of fringes arising along the bands are examples of the modified fringe pattern. This simulation study provides a wide theoretical survey of the type of bicrystal moiré image produced under a particular condition.
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Статті в журналах

Дисертації з теми "Effet moiré":

1

Lansonneur, Pierre. "Déflectométrie Moiré d’Ions de Basse Énergie pour l’Expérience AEGIS." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1191/document.

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Bien que les propriétés de l'antimatière soit largement testées dans le secteur faible, fort et électromagnétique, la question de la gravitation pour ces objets reste ouverte. En observant la chute libre d'atomes d'anti-hydrogène, l'expérience AEGIS prévoit de mesurer pour lapremière fois l'accéleration gravitationelle pour l'antimatière. Le dispositif prévu pour cette mesure se compose de trois réseaux en transmission et d'un détecteur possèdant une haute résolution spatiale. Le travail de cette thèse se concentre sur la caractérisation d'un tel dispositif avec une source d'ions de basse énergie, permettant de mesurer simultanément les champs électriques et magnétiques environnant. La sensibilité atteinte en font un dispositif compétitif avec les meilleurs appareils disponibles. Une attention particulière est également portée sur l'implémentation de l'expérience avec des réseaux de pas plus fin, afin de mettre en évidence l'interférence quantique des ions. Les effets qui pourraient réduire le contraste des franges d'interférences sont passés en revue et discutés. Enfin, la réalisation d'une ligne de faisceau capable de sélectionner des particules de basse énergie et l'intégration d'un détecteur silicium dédié à la détection d'antiprotons est détaillée dans le but de réaliser pour la première fois l'interférence de particules d'antimatière
Although numerous experiments investigate the properties of antimatter in the weak, strong and electromagnetic sector, the gravitational interaction for these objects remains an open question. By observing the free-fall of antihydrogen atoms, the AEGIS experiment plans toperform the first measurement of the gravitational acceleration on antimatter. The device envisioned for such an experiment consists in a set of three transmission gratings with a pitch of few micrometers, associated with a high resolution imaging detector. This thesis focuses on testing such a device with a low-energy ion beam, enabling one to measure simultaneously the magnitude of surrounding electric and magnetic fields. The sensitivity achieved makes such an apparatus competitive with state-of-the-art fieldmeters. An effort is moreover initiated to perform the same experiment with smaller grating periodicities since it could reveal the quantum interference of the ions. In order to probe the quantum behavior of protons, the effects which might destroy the interference pattern are reviewed and discussed. We finally detail the implementation of a velocity selector and a silicon detector dedicated to low energy antiprotons. These two components are indeed a prerequisite to perform for the first time theinterference of antimatter particles
2

Hong, Yuanzhuo. "Charge transport properties of graphene and its aligned heterostructures." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP020.

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Le graphène a une structure de bande unique que la bande de conduction et la bande de valence se touchent aux points de Dirac K and K', ce qui en fait un semi-conducteur à écart nul. La structure de la bande peut être modifiée en introduisant un potentiel périodique (super-réseau) qui place le graphène au-dessus du BN pour un alignement cristallographique. Dans cette thèse, je discute principalement des propriétés de transport de charge du graphène et de ses hétérostructures. Différentes méthodes de fabrication d'échantillons sont introduites pour réaliser des hétérostructures en fonction du but de l'expérience. Nous utilisons différentes techniques de transport dans le graphène monocouche/bicouche et leurs hétérostructures d'alignement pour étudier différents mécanismes de diffusion afin de comprendre si ceux-ci sont modifiés par la présence du super-réseau. Nous avons constaté que la diffusion aux petits angles est dominante dans les échantillons de graphène monocouche et bicouche. Grâce aux mesures de focalisation magnéto transversale (TMF), nous concluons que la diffusion électron-électron domine la suppression du TMF. Cependant, nous observons une réponse non identique dans l'alignement 0 ̊ et 60 ̊ pour le graphène bicouche dans TMF. Cela montre la structure de bande différente de deux alignements et nous indique que la symétrie de l'hétérostructure bicouche graphène/BN n'est pas de 60 ̊. Nous observons en outre la même réponse non identique dans l'effet Valley Hall (VHE) selon laquelle l'alignement 60 ̊ ne nous donne pas la relation cubique qui représente le VHE. Ce fait nous indique la triple symétrie du graphène bicouche/BN et montre également que la courbure de Berry n'est pas la seule explication du VHE. Nous proposons ici une explication possible de la relaxation de la structure atomique. La contrainte exercée sur la deuxième couche de graphène est différente et crée des champs de jauge qui agissent comme un pseudo-champ magnétique différent et affectent effectivement le VHE
Graphene has unique band structure that conduction band and valence band touch at the Dirac points K and K', making it a zero gap semiconductor. The band structure can be modified by introducing periodic potential (superlattice) that place graphene on top of BN to crystallographic alignment. In this thesis, I mainly discuss the charge transport properties of graphene and its heterostructures. Different sample fabrication methods are introduced to make stacks depending on experiment purpose. We use different transport techniques in monolayer/bilayer graphene and their alignment heterostructures to study different scattering mechanisms in order to understand if these are modified by the presence of the superlattice. We found that small angle scattering is dominant in both monolayer and bilayer graphene samples. Through the transverse magneto focusing (TMF) measurements, we have the conclusion that electron-electron scattering is in dominance of TMF suppression. However, we observe nonidentical response in 0 ̊ and 60 ̊ alignment for bilayer graphene in TMF. This shows the different band structure of two alignments and tell us that the symmetry of bilayer graphene/BN heterostructure is not 60 ̊.We further observe the same nonidentical response in valley Hall effect (VHE) that 60 ̊ alignment doesn't give us the cubic relation which represents the VHE. This fact tells us the three fold symmetry of bilayer graphene/BN and also show that Berry curvature is not the only explanation of VHE. Here we propose a possible explanation about atomic structure relaxation. The strain on the second layer of graphene is different and create gauge fields that act as different pseudo magnetic field and indeed affect the VHE
3

Udvardy, Bálint. "Detekce malých změn objektů pomocí kamery." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413263.

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One of the basic problems in computer vision is motion detection and analysis in a given scene. This work focuses on detecting small changes in the image by using the moiré phenomenon. The main goal of this thesis is to detect different types of dislocations with algorithms used in computer vision. In this work synthetically created pictures are analysed, which were created with the mathematical model of a pinhole camera.
4

Huder, Loïc. "Lien entre structure et propriétés électroniques des moirés de graphène étudié par microscopie à effet tunnel." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY083/document.

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Les dernières années ont vu l'avènement des couches cristallines bidimensionnelles, appelées matériaux 2D. L'exemple le plus connu est le graphène, d'autres étant le nitrure de bore hexagonal isolant et le diséléniure de niobium supraconducteur. Ces matériaux 2D peuvent être empilés de manière contrôlée sous la forme d'hétérostructures de van der Waals pour obtenir les propriétés électroniques désirées. L’une des plus simples hétérostructures de van der Waals est l'empilement de deux couches de graphène tournées. Cet empilement donne naissance à un moiré qui peut être vu comme un potentiel superpériodique dépendant de l'angle entre les deux couches. Les propriétés électroniques des couches tournées de graphène sont intimement liées à ce moiré.Le sujet de cette thèse est l'étude expérimentale du lien entre la structure et les propriétés électroniques des couches tournées de graphène par Microscopie et Spectroscopie à effet tunnel à basse température.Alors que l'effet de l'angle entre les couches sur les propriétés électroniques a déjà été étudié en détail, la modification de celles-ci par une déformation des couches n'a été envisagée que récemment. La première partie de ce travail expérimental étudie la modification par la déformation des propriétés électroniques de couches de graphène tournées d'un angle de 1.26° crûes sur carbure de silicium. La déformation en question est différente dans les deux couches et son effet apparait clairement dans la densité locale d'états électroniques du moiré. Contrairement à une déformation appliquée identiquement aux deux couches, une différence de déformations entre les couches (déformation relative) modifie fortement la structure de bandes même à faibles valeurs de déformations. Alors que la déformation relative était spontanément présente, la deuxième partie de cette thèse s'intéresse à l'effet d'une déformation appliquée directement aux couches de graphène. Cette déformation vient d'une interaction induite par l'approche de la pointe STM vers la surface de graphène. La modification active de la densité d'états qui en résulte dépend de la position de la pointe dans le moiré avec l'apparition d'instabilités périodiques lorsque la distance entre la pointe et l'échantillon est très faible.La troisième partie de cette thèse concerne l'étude d'un autre type de modification des propriétés électroniques consistant en l'induction de supraconductivité dans les couches de graphène. Cette modification est effectuée par une croissance du graphène en une seule étape sur du carbure de tantale supraconducteur. Les résultats montrent la formation d'une couche de carbure de tantale de grande qualité sur laquelle les couches de graphène forment des moirés. La mesure à basse température de la densité d'états de ces moirés montre la présence d'un effet de proximité supraconducteur induit par le carbure de tantale
Recent years have seen the emergence of two-dimensional crystalline layers, called 2D materials. Examples include the well-known graphene, insulating hexagonal boron nitride and superconducting niobium diselenide. The stacking of these 2D materials can be controlled to achieve desirable electronic properties under the form of van der Waals heterostructures. One of the simplest van der Waals heterostructures is the misaligned stacking of two graphene layers. Twisted graphene layers show a moiré pattern which can be viewed as a superperiodic potential that depends on the twist angle. The electronic properties of the twisted graphene layers are strongly linked to this moiré pattern.The subject of the present thesis is the experimental study of the link between the structural and the electronic properties of twisted graphene layers by means of low-temperature Scanning Tunneling Microscopy and Spectroscopy (STM/STS).While the effect of the twist angle has already been studied in great details, the modulation of the electronic properties by the deformation of the layers has been explored only recently. In the first part of this experimental work, a strain-driven modification of the electronic properties is probed in graphene layers with a twist angle of 1.26° grown on silicon carbide. The determined strain is found to be different in the two layers leading to a clear signature in the local electronic density of states of the moiré even at low strain magnitudes. Contrary to a strain applied in the two layers, this difference of strain between the layers (relative strain) modifies strongly the electronic band structure even at low strain magnitudes. While this relative strain is natively present, the second part of the work explores the effect of an applied strain in the layers. This is realized by approaching the STM tip to the graphene surface to trigger an interaction between the two. The resulting active modification of the density of states is shown to depend on the position on the moiré, leading to periodic instabilities at very low tip-sample distances.In the third part of the work, another type of modification of the electronic properties is studied when superconductivity was induced in the graphene layers. This is done by growing graphene on superconducting tantalum carbide in a single-step annealing. The results show the formation of a high-quality tantalum carbide layer on which graphene layers form moiré patterns. The low-temperature density of states of these moirés show evidence of a superconducting proximity effect induced by the tantalum carbide
5

Mehler, Alexander [Verfasser], Yuriy [Akademischer Betreuer] Dedkov, Stefan [Akademischer Betreuer] Krischok, and Jörg [Gutachter] Kröger. "Two-dimensional materials on metal surfaces: impact on molecular frontier orbitals, vibrons and the moiré effect / Alexander Mehler ; Gutachter: Jörg Kröger ; Yuriy Dedkov, Stefan Krischok." Ilmenau : TU Ilmenau, 2021. http://d-nb.info/1234911868/34.

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6

Maharajan, Ranjit Kumar. "INVESTIGATION OF THE EFFECT OF SWELLING AND SHRINKAGE ON THE WRINKLING RESPONSE OF LOCALLY WETTED PAPERS SUBJECTED TO TENSION WITH APPLICATION TO WEB-FED INK-JET PRINTING." Miami University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1185295870.

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7

Chen, Kuo-Lieh, and 陳國烈. "Fantastic and Colorful Moiré Patterns – Digital Art Creations of the Moiré Effect by Using Micrographic Elements." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90788887256453655631.

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Анотація:
碩士
國立臺中教育大學
美術學系碩士班
101
Moiré patterns are considered to be one type of painting within the Optical Arts field. This study mainly describes the digital art creations of colorful Moiré patterns by using very tiny dots and line gratings to make a distinct performance of Moiré effects by using traditional thicker grating. Meanwhile, the effect of Moiré patterns with red, green and blue gratings has generated more colorful and fantastic effects. The creation works of this study contains plain colorful Moiré patterns and Moiré patterns animation. The research also serves to explore different methods of enhancing Moiré art by utilizing various media such as ink jet printing on paper and transparent film as well as large-scaled monitor projecting in public. The study not only displays creative Moiré pattern designs but also describes the production process and findings in detail. This research contributed to understanding how art creation, production techniques and displays of Moiré works help us to know the beauty of Moiré patterns. And finally, suggestions are provided for those interested in researching Moiré patterns created by other methods, such as by using different graphic elements, a combination of digital printmaking and traditional printmaking, and the application of cultural creative products.
8

Chen, Syu-Dong, and 陳旭東. "Measurement of angular displacement system based on Talbot effect and moiré method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/kh3qne.

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Анотація:
碩士
國立中央大學
光機電工程研究所
102
We proposed a new method based on the moiré technique and Talbot effect to measure the angular displacement. The measurement system is divided into two parts, the optical moiré system and the phase analysis system. In the first part, the collimated He-Ne laser beam is expanded by the beam expander (BE) and is forward incident into the two linear amplitude gratings, which placed symmetrically by a centre of the precision rotation stage. These two gratings can be regarded as the a spatial modulator. After passing through the gratings, the spatial modulated light beam forms a moiré pattern and is captured by the CCD camera. By adjusting the distance D between the two gratings to meet the Talbot image distance (Zt ), the clear and high contrast moiré pattern can be obtained. When the rotation stage provides a rotation, the relative displacement between these two gratings results in the phase shifting of the moiré pattern. The phase analysis by the subfringe integration arithmetic (SIA). Here, the period of moiré pattern is then divided into four areas, A, B, C and D for further analysis. By means of calculating the intensity integration of the four areas with SIA, the variation of phase shift of the moiré pattern can be obtained, and the rotation angle can be determined. This is the second part of this system. Clearly, the experimental results demonstrate that the measurement range of our system can achieve ±6°. Considering the high-frequency noise, the measurement resolution of the system is about 0.36 arcsec.
9

Wu, Wei-Lun, and 吳維倫. "Measurement of object''s curvature by usingTalbot effect and Moiré interferometry." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78711595760934795856.

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Анотація:
碩士
逢甲大學
光電研究所
99
In this thesis, based on Talbot effect and moir? interferometry, a method for measuring object''s curvature was proposed. Firstly, a collimated light passing through a periodic grating can generate a self-image at a specific distance. When the self-image is nearly projected on an object''s surface, the reflected image is formed at another specific distance. The reflected image is captured by a CCD camera with image processing, and the period for the image can be obtained. Accordingly, a virtual grating with similar period can be generated and rotated with a specific angle by MATLAB software. A moir? image can be obtained by superposition of these two images. The tilt angle of the moir? fringes can be determined by fast Fourier transform of the moir? image. Finally, substituting the related experimental parameters into a special derived equation, the curvature of the object can be calculated. In order to show the validity of the method, stainless steel balls and convex mirrors were measured. The experimental results correspond well with that of a commercial Keratometer. The measurement resolution is about 0.001 mm-1. The merits of this method include a simple structure, free of mechanical disturbance, high contrast of fringes, and high stability. In addition, this method can be applied for transmission and opaque objects and virtual gratings with different period can be applied for various objects.
10

Kundu, Sudipta. "Electronic structure of two-dimensional materials: Effect of point defects and moiré patterns." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5611.

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In the last two decades, research on two-dimensional (2D) materials has gained momentum due to their capability to host a wide range of novel phases of matter. These materials have also found applications in electronic, optoelectronic and sensor devices. The electronic structure of material forms a basic building block to understand its electronic phases. It can be altered by several external factors, for example, strain, defects, moiré patterns or electric field. In this thesis, we focus on two such external factors: point defects and moiré patterns. Using first-principle calculations, we study the influence of these factors on the electronic structure of phosphorene and transition metal dichalcogenides. Defects appear spontaneously in a material at a finite temperature. We investigate native point defects: vacancy and self-interstitial in mono- and bilayer phosphorene. We have studied formation energies, quasiparticle energies of defect states, and charge transition levels of these defects using ab initio density functional theory and GW approximation to the electron self-energy. These defects have low formation energies of 0.9–1.6 eV in the neutral state. Furthermore, the vacancy in phosphorene behaves as an acceptor-like defect which can explain the p-type conductivity in phosphorene. On the other hand, interstitial can show both acceptor- and donor-like behaviour. In homobilayers of transition metal dichalcogenides, a small twist can be introduced to form a moiré superlattice (MSL). Recently, there is experimental evidence of flat bands in such twisted bilayer structures. We study the flat bands in twisted WSe2 where strong spin-orbit interaction gives rise to novel and interesting phenomenon. Flat bands emerge at both the band edges in twisted bilayer WSe2. The flat bands at the valence band edge originate from the K point of the unit cell Brillouin zone, unlike other twisted transition metal dichalcogenide structures. For twist angle (θ) close to 0◦, the bands at the valence band edge also possess a non-trivial topology. Quantum spin Hall insulating state, which is a consequence of this non-trivial topology should be experimentally accessible for θ < 3.5◦. For θ close to 60◦, the flattening of the bands arising from the K point is a consequence of the atomic reconstructions of the individual layer. Our findings are in excellent agreement with spectroscopic measurements on this material. Another way to generate a moiré pattern from the homobilayer is by applying strain to one of the layers. This induces a lattice constant mismatch between the two layers and causes the formation of an MSL. This strained MSL shows very different structural and electronic properties than the twisted ones. We show that the strained MSLs provide a platform to study the ionic Hubbard model on a honeycomb lattice and the Hubbard model on a triangular lattice. Two different TMD layers can be rotated and stacked on top of each other to form a twisted heterostructure. We study the electronic structure and optical properties of a twisted MoS_2/MoSe_2 heterostructure. The electronic band structure of this system and its origin in the individual layer’s unit cell has been explored. Experimentally, it has been found that interlayer excitons in heterostructure are long-lived compared to the intralayer ones. We have studied both kinds of excitons in this system. Our calculations show that optically-dark-finite-centre-of-mass-momentum intralayer excitons in bilayers of MoS2 and MoSe2 become optically allowed in the heterostructure. This is due to the presence of the moiré potential. Furthermore, we clarify the nature of the interlayer excitons. Our calculations show that this heterostructure has a type II band alignment. This results in the lowest energy interlayer excitons as those arising from transitions between the valence band of MoSe2 to the conduction band of MoS2.

Книги з теми "Effet moiré":

1

Amidror, Isaac. The theory of the Moiré phenomenon. Dordrecht: Kluwer Academic, 2000.

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2

Amidror, Isaac. The Theory of the Moiré Phenomenon: Volume II Aperiodic Layers (Computational Imaging and Vision). Springer, 2007.

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3

The Moir Effect. Book Horse/Cabinet Books, 2012.

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4

Saveljev, Vladimir. Geometry of the Moiré Effect in One, Two, and Three Dimensions. Cambridge Scholars Publishing, 2022.

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5

Le rôle des guerres dans la mémoire des européens: Leur effet sur la conscience dêtre européen (Euroclio). Peter Lang, 1997.

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Частини книг з теми "Effet moiré":

1

Gooch, Jan W. "Moire Effect." In Encyclopedic Dictionary of Polymers, 468. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7601.

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2

Ritter, R., and M. Hahne. "Interpretation of Moiré Effect for Curvature Measurement of Shells." In Experimental Stress Analysis, 331–40. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4416-9_37.

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3

Madonia, Francesco Paolo Alexandre. "Effet de moiré et dérobades diégétiques chez Vautrin." In « La grâce de montrer son âme dans le vêtement » Scrivere di tessuti, abiti, accessori. Studi in onore di Liana Nissim, 269–78. Ledizioni, 2015. http://dx.doi.org/10.4000/books.ledizioni.6587.

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4

"Moire effect." In Encyclopedic Dictionary of Polymers, 628. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_7475.

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5

"Max Ramsay is the cardboard cutout Ozzie clod who warns his son, Shane, against dating Daphne because she works as a stag-night stripper. His main fear seems to be the effect the newly arrived Daphne might have on the price of his property. (Smurthwaite 1986) As Grahame Griffin notes, “the closing credit sequence . . . is a series of static shots of suburban houses singled out for display in a manner reminiscent of real estate advertisements” (Griffin 1991: 175). Small business abounds in Neighbours: a bar, a boutique, an engineering company, with no corporate sector and no public servants or bureaucrats apart from a headmistress. 10 Writing skills must be acknowledged. It is very hard to make the mundane interesting, and indeed to score multiple short plot lines across a small number of characters (twelve to fifteen), as is appropriate to representing the local, the everyday, the suburban. As Moira Petty remarks, Neighbours is successful because “it’s very simple. The characters are two dimensional and the plots come thick and fast. The storylines don’t last long, so if you don’t like one, another will come along in a few days” (quoted by Harris 1988). These ten textual reasons doubtless contribute, differentially across different export markets, to Neighbours’s success in many countries of the world. Its wholesome neighborliness, its cosy everyday ethos would appear to be eminently exportable. However, lest it be imagined that Neighbours has universal popularity or even comprehensibility, there remain some 150 countries to which it has not been exported, and many in which its notions of kinship systems, gender relations, and cultural spaces would appear most odd. The non-universality of western kinship relations, for example, is clearly evidenced in Elihu Katz and Tamar Liebes’s comparison of Israeli and Arab readings of Dallas (Katz and Leibes 1986). And, indeed, there are two familiar territories to be considered later – the USA and France – in which it has been screened and failed. Significantly, the countries screening Neighbours are mostly anglophone and well familiar with British, if not also with Australian soaps. But why does Neighbours appeal so forcibly in the UK? In the UK market, I suggest, five institutional and cultural preconditions enabled Neighbours’s phenomenal success. Some of these considerations are, of course, the sine qua non of Neighbours even being seen on UK television. The first precondition was its price, reportedly A$54,000 per show for two screenings; with EastEnders costing A$80,000 per episode, Neighbours was well worth a gamble (Kingsley 1989: 241). Scheduling, too, was vital to Neighbours’s success. This has two dimensions. Neighbours was the first program on UK television ever to be stripped over five weekdays (Patterson 1992). BBC Daytime Television, taking off under Roger Loughton in 1986, while Michael Grade was Programme Controller, was so bold in this as to incur the chagrin of commercial." In To Be Continued..., 112. Routledge, 2002. http://dx.doi.org/10.4324/9780203131855-14.

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Тези доповідей конференцій з теми "Effet moiré":

1

Loktev, M., and Y. Shao. "Projection lens testing with Moiré effect." In SPIE Advanced Lithography, edited by Martha I. Sanchez and Vladimir A. Ukraintsev. SPIE, 2017. http://dx.doi.org/10.1117/12.2264343.

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2

Wu, S., S. Wei, I. Kao, and F. P. Chiang. "Wafer Surface Measurements Using Shadow Moiré With Talbot Effect." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1112.

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Abstract In this paper, a modified shadow moiré technique is applied to measure surface topology of wafers. When a wafer is sliced, either by an inner-diameter (ID) saw or wiresaw, the surface needs to be measured to ensure the consistency of quality. Two important characteristics of the wafer surface measurements are the warpage and total thickness variation (TTV). Currently, the most commonly used method of wafer measurement employs a pair of capacitive measuring probes which sample points on the surface of a rotating wafer to obtain the contours of surface. Many sampling points on the surface are needed for more accurate measurements; however, this will require more time for the inspection of wafers during production. An innovative alternative for full-field, whole-wafer measurement is developed using a laser light source and the modified shadow moiré technique. This methodology enables one to examine the whole wafer surface quickly and simultaneously. In this study, a 1000 lines/inch reference grating is employed as the standard to create a shadow moiré pattern. In addition, the Talbot effect is utilized to adjust the gap, or the so-called Talbot distance, between the grating and the wafer surface such that a fringe pattern of good quality can be obtained. By using the phase shifting technique, the resolution (or sensitivity) can be enhanced by two order of magnitude. The results show that not only the full view of whole wafer surface can be obtained, but also enhanced surface resolution and accuracy can be realized. In addition, warpage due to excessive residual stresses can be observed distinctly with fringe patterns because of the global and interconnected moiré fringes. This process is faster, especially when dealing with wafers with diameter larger than 200mm (8″). Experimental results of both 200mm single crystalline and 100 × 90mm polycrystalline wafers are presented. The system can also be fully automated to become an on-line inspection tool.
3

Cai, FuXin Cai, YiChen Tao Tao, and Su Shen Shen. "Moiré imaging film with fluorescence enhancement effect." In 4th Optics Young Scientist Summit (OYSS 2020), edited by Chaoyang Lu, Yangjian Cai, Feng Chen, and Zhaohui Li. SPIE, 2021. http://dx.doi.org/10.1117/12.2591329.

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4

Li, Yonglei, Justin Lim, Nahee Park, Yuqian Zhang, Xiaolei Liu, Yasutaka Okada, Gloria Chen, et al. "OPO improvements by moiré effect-based imaging." In Metrology, Inspection, and Process Control XXXVII, edited by John C. Robinson and Matthew J. Sendelbach. SPIE, 2023. http://dx.doi.org/10.1117/12.2658074.

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5

Zou, Daqing, Xiaoyuan He, Minfu Lu, Sheng Liu, and Yifan Guo. "Refined Micro Moire System and its Applications to Chip Scale and Flip-Chip Packages." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0429.

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Abstract The chip scale package (CSP) and flip-chip (FC) technologies are currently developed by electronic industry for high performance, high density and miniaturized assembly applications. The reliability of these packages continues to be a major concern due to the increase of die size, circuit density, and operating temperature. Moiré interferometry is a full field optical method, which can be used for the thermal mechanical deformation measurement of electronic packages and packaging materials. By using ordinary moiré interferometry, fringes represent displacement contour of 417 nm. In most cases, in a solder bump of CSP and FC packages, the thermal mechanical deformation is usually only 2 or 3 fringes (with relative displacement of about 1.2 μm), but the local strain of the bump is high because of the small size of the bump. It is difficult to resolve the local strain value for ordinary moiré interferometry, which can only resolve strain values averaged over a relative larger area. Based on high magnification and phase shifting method, refined micro moiré interferometer is expected to have a localized sensitivity and resolution for localized strain measurements. By using high precision close-loop controller for phase shifting in the refined moiré system, excellent results were obtained in the thermal mechanical deformation study of CSP samples and in the study of the solder bump mis-registration effect of FC samples. The results also showed that refined micro moiré method is effective in resolving deformation within a small area like a corner of a C4 bump.
6

Chiang, Fu-Pen, X. Yu, B. H. Dong, and D. Z. Yun. "Application of the Talbot effect to moire methods." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.tuf7.

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The classical reflection, shadow, and in-plane moire methods for slope, deflection, and in-plane displacement measurement, respectively, employ an incoherent light source for illumination. Diffraction effect on the grating is either ignored or blamed for the lack of fringe clarity. In this paper we use a laser as the light source and take advantage of the Talbot effect to construct various forms of Talbot interferometers to increase the sensitivity and fringe quality of these methods. In the Talbot reflection moire we reach a sensitivity of 4 × 10−5 rad per fringe for slope measurement; in the Talbot shadow moire we obtain a sensitivity of 0.0116 mm per fringe with increased range of measurable depth; and in the in-plane Talbot moire high quality fringes are observed even when the specimen and reference gratings (spatial frequency up to 40 lines/mm) are separated at a distance half a meter apart.
7

Trusiak, Maciej, Krzysztof Patorski, Vicente Micó, José Ángel Picazo-Bueno, Piotr Zdańkowski, and Maria Cywińska. "Moiré effect-based interference microscopy for biospecimen characterization." In Interferometry XIX, edited by Michael B. North Morris, Katherine Creath, Jan Burke, and Angela D. Davies. SPIE, 2018. http://dx.doi.org/10.1117/12.2323601.

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8

Hagio, Yoshinori, Kentaro Kasa, Sho Kawadahara, Manabu Takakuwa, Yosuke Takahata, Katsuya Kato, and Akihiro Nakae. "Overlay improvement for semiconductor manufacturing using Moiré effect." In 2020 31st Annual SEMI Advanced Semiconductor Manufacturing Conference (ASMC). IEEE, 2020. http://dx.doi.org/10.1109/asmc49169.2020.9185396.

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9

Peng, Chenyu, Liang Li, Christopher Yap, and Guangya Zhou. "Near Field Moiré Effect of Subwavelength Dielectric Gratings." In 2018 International Conference on Optical MEMS and Nanophotonics (OMN). IEEE, 2018. http://dx.doi.org/10.1109/omn.2018.8454607.

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10

Jutamulia, S., T. W. Lin, and F. T. S. Yu. "Color visualization of a phase object using the Talbot effect." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.thq6.

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The Talbot image of a grating can be formed with a collimated coherent light illumination. The distance of the Talbot image depends on the illumination wavelength. Color-coded moire fringes are obtained by placing a second grating at the Talbot distance, if a white-light source is used instead of a laser. The color of the moire fringes is determined by the distance of the two gratings. If a phase object is inserted between two gratings, the color of the moire fringes is varied correspondingly to the phase variation which actually changes the optical path of light between two gratings. Therefore, a color visualization of phase object can be obtained.

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