Relevant bibliographies by topics / Coherent Illumination

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Coherent Illumination'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Coherent Illumination"

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Klychkova, D. M., and V. P. Ryabukho. "Spatial spectrum of coherence signal for a defocused object images in digital holographic microscopy with partially spatially coherent illumination." Computer Optics 42, no. 3 (July 25, 2018): 414–23. http://dx.doi.org/10.18287/2412-6179-2018-42-3-414-423.

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We study the effect of a decrease in the magnitude of the coherence signal in high-frequency spatial spectrum for a defocused object image in transmission digital holographic microscopy with quasimonochromatic partially spatially coherent illumination. A theoretical description and results of the numerical simulation of the effect for a point scattering object are presented. The effect is experimentally studied by illuminating layered quasi-point scatterers with partially spatially coherent laser light obtained using a moving scatterer. The comparison of the experimental and theorybased numerical results shows them to be in good agreement.
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Chang, Huibin, Pablo Enfedaque, Yifei Lou, and Stefano Marchesini. "Partially coherent ptychography by gradient decomposition of the probe." Acta Crystallographica Section A Foundations and Advances 74, no. 3 (April 11, 2018): 157–69. http://dx.doi.org/10.1107/s2053273318001924.

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Coherent ptychographic imaging experiments often discard the majority of the flux from a light source to define the coherence of the illumination. Even when the coherent flux is sufficient, the stability required during an exposure is another important limiting factor. Partial coherence analysis can considerably reduce these limitations. A partially coherent illumination can often be written as the superposition of a single coherent illumination convolved with a separable translational kernel. This article proposes the gradient decomposition of the probe (GDP), a model that exploits translational kernel separability, coupling the variances of the kernel with the transverse coherence. An efficient first-order splitting algorithm (GDP-ADMM) for solving the proposed nonlinear optimization problem is described. Numerical experiments demonstrate the effectiveness of the proposed method with Gaussian and binary kernel functions in fly-scan measurements. Remarkably, GDP-ADMM using nanoprobes produces satisfactory results even when the ratio between the kernel width and the beam size is more than one, or when the distance between successive acquisitions is twice as large as the beam width.
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Salik, Boaz, Joseph Rosen, and Amnon Yariv. "Nondiffracting images under coherent illumination." Optics Letters 20, no. 17 (September 1, 1995): 1743. http://dx.doi.org/10.1364/ol.20.001743.

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Chen, Gang, Jian Hua Zhu, Zhen Xiong Luo, Yu Zhao, and Ze Ren Li. "Improvement of Pulsed Holographic Recording Characteristics of Polyvinyl Alcohol/Acrylamide Green-Sensitive Photopolymer." Advanced Materials Research 1035 (October 2014): 492–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1035.492.

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Coherent pre-illumination technique is proposed to improve the pulsed holographic recording characteristics of polyvinyl alcohol (PVA) /acrylamide green-sensitive photopolymer. By optimizing the pre-illumination parameters such as pre-illumination energy density and pre-illumination delay time, the photosensitivity and diffraction efficiency of photopolymer under pulsed holographic recording are improved effectively. For the coherent pre-illumination energy density of 2mJ/cm2, total pre-illumination energy of 50mJ/cm2, the diffraction efficiency of 85% can be obtained with holographic exposure of 35mJ/cm2. For the coherent pre-illumination delay time of 20seconds, the diffraction efficiency of 60% is obtained with holographic exposure of 17.5mJ/cm2. The photosensitivity is successfully improved about 8 times compared with other reported results, it has good application prospects in the measurements of high-speed transient processes.
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Wilde, Jeffrey P., Joseph W. Goodman, Yonina C. Eldar, and Yuzuru Takashima. "Coherent superresolution imaging via grating-based illumination." Applied Optics 56, no. 1 (November 17, 2016): A79. http://dx.doi.org/10.1364/ao.56.000a79.

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Nguyen, T. H., C. Edwards, L. L. Goddard, and G. Popescu. "Quantitative phase imaging with partially coherent illumination." Optics Letters 39, no. 19 (September 17, 2014): 5511. http://dx.doi.org/10.1364/ol.39.005511.

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Shapiro, Jeffrey H., and Seth Lloyd. "Quantum illumination versus coherent-state target detection." New Journal of Physics 11, no. 6 (June 24, 2009): 063045. http://dx.doi.org/10.1088/1367-2630/11/6/063045.

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Ma, Rui, Zhao Wang, Egor Manuylovich, Wei Li Zhang, Yong Zhang, Hong Yang Zhu, Jun Liu, Dian Yuan Fan, Yun Jiang Rao, and Anderson S. L. Gomes. "Highly coherent illumination for imaging through opacity." Optics and Lasers in Engineering 149 (February 2022): 106796. http://dx.doi.org/10.1016/j.optlaseng.2021.106796.

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Mainville, J., F. Bley, F. Livet, E. Geissler, J. F. Legrand, D. Abernathy, G. Grübel, S. G. J. Mochrie, and M. Sutton. "Speckle Structure in Small-Angle Coherent X-ray Scattering." Journal of Applied Crystallography 30, no. 5 (October 1, 1997): 828–32. http://dx.doi.org/10.1107/s0021889897002185.

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Small-angle coherent X-ray scattering measurements on a polymer gel and on a single crystal of Al–9at.% Li are reported. Speckle structures were recorded using a direct-illumination CCD camera. A speckle intensity fluctuation of ~20% was observed. Time and space statistics for the signal provided estimates of the coherence effects and the measurements demonstrate the wavevector dependence of the coherence effects. Preliminary intensity-fluctuation spectroscopy was performed for Al–Li.
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Moxham, Thomas E. J., Aaron Parsons, Tunhe Zhou, Lucia Alianelli, Hongchang Wang, David Laundy, Vishal Dhamgaye, Oliver J. L. Fox, Kawal Sawhney, and Alexander M. Korsunsky. "Hard X-ray ptychography for optics characterization using a partially coherent synchrotron source." Journal of Synchrotron Radiation 27, no. 6 (October 16, 2020): 1688–95. http://dx.doi.org/10.1107/s1600577520012151.

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Ptychography is a scanning coherent diffraction imaging technique which provides high resolution imaging and complete spatial information of the complex electric field probe and sample transmission function. Its ability to accurately determine the illumination probe has led to its use at modern synchrotrons and free-electron lasers as a wavefront-sensing technique for optics alignment, monitoring and correction. Recent developments in the ptychography reconstruction process now incorporate a modal decomposition of the illuminating probe and relax the restriction of using sources with high spatial coherence. In this article a practical implementation of hard X-ray ptychography from a partially coherent X-ray source with a large number of modes is demonstrated experimentally. A strongly diffracting Siemens star test sample is imaged using the focused beam produced by either a Fresnel zone plate or beryllium compound refractive lens. The recovered probe from each optic is back propagated in order to plot the beam caustic and determine the precise focal size and position. The power distribution of the reconstructed probe modes also allows the quantification of the beams coherence and is compared with the values predicted by a Gaussian–Schell model and the optics exit intensity.
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Dissertations / Theses on the topic "Coherent Illumination"

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Gadelha, Matheus Abrantes. "An augmented reality pipeline to create scenes with coherent illumination using textured cuboids." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br/handle/123456789/19823.

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Sombras e ilumina??o possuem um papel importante na s?ntese de cenas realistas em Computa??o Gr?fica. A maioria dos sistemas de Realidade Aumentada rastreia marcadores posicionados numa real, obtendo sua posi??o e orienta??o para servir como refer?ncia para o conte?do sint?tico, produzindo a cena aumentada. A exibi??o realista de conte?do aumentado com pistas visuais coerentes ? um objetivo desej?vel em muitas aplica??es de Realidade Aumentada. Contudo, renderizar uma cena aumentada com ilumina??o realista ? um tarefa complexa. Muitas abordagens existentes dependem de uma fase de pr?-processamento n?o automatizada para obter os par?metros de ilumina??o da cena. Outras t?cnicas dependem de marcadores espec?ficos que cont?m probes de luz para realizar a estima??o da ilumina??o do ambiente. Esse estudo se foca na cria??o de um m?todo para criar aplica??es de Realidade Aumentada com ilumina??o coerente e sombras, usando um cub?ide texturizado como marcador, n?o requerendo fase de treinamento para prover informa??o acerca da ilumina??o do ambiente. Um marcador desse tipo pode ser facilmente encontrado em ambientes comuns: a maioria das embalagens de produtos satisfaz essas caracter?sticas. Portanto, ese estudo prop?e uma maneira de estimar a configura??o de uma luz direcional utilizando o rastreamento de m?ltiplas texturas para renderizar cenas de Realidade Aumentada de maneira realista. Tamb?m ? proposto um novo descritor de features visuais que ? usado para realizar o rastreamento de m?ltiplas texturas. Esse descritor extende o descritor bin?rio e ? denominado descritor discreto. Ele supera o atual estado-da-arte em velocidade, enquanto mant?m n?veis similares de precis?o.
Shadows and illumination play an important role when generating a realistic scene in computer graphics. Most of the Augmented Reality (AR) systems track markers placed in a real scene and retrieve their position and orientation to serve as a frame of reference for added computer generated content, thereby producing an augmented scene. Realistic depiction of augmented content with coherent visual cues is a desired goal in many AR applications. However, rendering an augmented scene with realistic illumination is a complex task. Many existent approaches rely on a non automated pre-processing phase to retrieve illumination parameters from the scene. Other techniques rely on specific markers that contain light probes to perform environment lighting estimation. This study aims at designing a method to create AR applications with coherent illumination and shadows, using a textured cuboid marker, that does not require a training phase to provide lighting information. Such marker may be easily found in common environments: most of product packaging satisfies such characteristics. Thus, we propose a way to estimate a directional light configuration using multiple texture tracking to render AR scenes in a realistic fashion. We also propose a novel feature descriptor that is used to perform multiple texture tracking. Our descriptor is an extension of the binary descriptor, named discrete descriptor, and outperforms current state-of-the-art methods in speed, while maintaining their accuracy.
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Patrick, Mark Adam. "Illumination Strategies to Reduce Target Orientation Requirements and Speckle in Millimeter Wave Imaging." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397656078.

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Kosmeier, Sebastian. "Optical eigenmodes for illumination & imaging." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3369.

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This thesis exploits so called “Optical Eigenmodes” (OEi) in the focal plane of an optical system. The concept of OEi is introduced and the OEi operator approach is outlined, for which quadratic measures of the light field are expressed as real eigenvalues of an Hermitian operator. As an example, the latter is employed to locally minimise the width of a focal spot. The limitations of implementing these spots with state of the art spatial beam shaping technique are explored and a selected spot with a by 40 % decreased core width is used to confocally scan an in focus pair of holes, delivering a two-point resolution enhanced by a factor of 1.3. As a second application, OEi are utilised for fullfield imaging. Therefore they are projected onto an object and for each mode a complex coupling coefficient describing the light-sample interaction is determined. The superposition of the OEi weighted with these coefficients delivers an image of the object. Compared to a point-by-point scan of the sample with the same number of probes, i.e. scanning points, the OEi image features higher spatial resolution and localisation of object features, rendering OEi imaging a compressive imaging modality. With respect to a raster scan a compression by a factor four is achieved. Compared to ghost imaging as another fullfield imaging method, 2-3 orders of magnitude less probes are required to obtain similar images. The application of OEi for imaging in transmission as well as for fluorescence and (surface enhanced) Raman spectroscopy is demonstrated. Finally, the applicability of the OEi concept for the coherent control of nanostructures is shown. For this, OEi are generated with respect to elements on a nanostructure, such as nanoantennas or nanopads. The OEi can be superimposed in order to generate an illumination of choice, for example to address one or multiple nanoelements with a defined intensity. It is shown that, compared to addressing such elements just with a focussed beam, the OEi concept reduces illumination crosstalk in addressing individual nanoelements by up to 70 %. Furthermore, a fullfield aberration correction is inherent to experimentally determined OEi, hence enabling addressing of nanoelements through turbid media.
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Gassenbauer, Václav. "Illumination coherence for ligh transport simulation." Rennes 1, 2011. http://www.theses.fr/2011REN1S098.

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Simulation of light transport in a scene is an essential task in realistic image synthesis. However, an accurate simulation of light as it bounces in the scene is time consuming. It has been shown that a key to speeding up light transport simulation algorithms is to take advantage of the high degree of spatial, angular, and temporal coherence. In this thesis we make three contributions in this area. First, we propose spatial directional radiance caching (SDRC) for accelerating the light transport simulation in scenes with glossy surfaces. The SDRC algorithm takes advantage of the smoothness of shading on glossy surfaces by interpolating the indirect illumination from a set of sparsely distributed radiance samples that are both spatially and directionally close. In the next part of the thesis, we propose an efficient and accurate local principal component analysis (LPCA) algorithm for dimensionality reduction and data compression of large data sets. To achieve efficiency our new algorithm, called SortCluster-LPCA, passes various information from previous iteration to the next. Improved accuracy is achieved through better initial seeding of cluster centroids in LPCA. Finally, we describe a work in progress focusing on the development of an algorithm for interactive relighting of animation sequences with indirect illumination. We formulate the relighting problem as a large 3D array expressing light propagation in a scene over multiple frames. We suggest an adaptive algorithm to make the pre-computation tractable exploiting coherence in light transport
La simulation de la propagation de la lumière dans une scène est une tâche essentielle en synthèse d'images réalistes. Cependant, une simulation correcte de la lumière ainsi que ses différents rebonds dans la scène reste couteuse en temps de calcul. Premièrement, nous proposons l'algorithme de cache de luminance spatial et directionnel SDRC. L'algorithme SDRC tire parti du fait que les variations d'éclairage sont douces sur les surfaces brillantes. L'éclairage en un point de la scène est alors calculé en interpolant l'éclairage indirect connu pour un ensemble d'échantillons de luminance spatialement proches et de directions similaires. Dans la partie suivante, nous présentons un algorithme efficace et précis d'analyse locale en composantes principales LPCA pour réduire la dimension et compresser un grandensemble de données. Pour améliorer l'efficacité de notre nouvel algoritme celui-ci propage les informations issues d'une itération à une itération suivante. En choisissant une meilleure graine initiale pour les centroïdes des clusters dans LPCA, la précision de la méthode est améliorée et produit une meilleure classification des données. Enfin, nous décrivons des travaux en cours de réalisation concernant une méthode de ré-éclairage interactif d'une séquence animée en prenant en compte l'éclairage indirect. Le problème de ré-éclairage est représenté sous la forme d'une grande matrice 3D représentant la propagation de la lumière dans la scène pour plusieurs images de la séquence. Un algorithme adaptatif pré-calcule la propagation de la lumière en exploitant les cohérences potentielles
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Boye, Pit. "Nanofocusing Refractive X-Ray Lenses." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-27137.

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This thesis is concerned with the optimization and development of the production of nanofocusing refractive x-ray lenses. These optics made of either silicon or diamond are well-suited for high resolution x-ray microscopy. The goal of this work is the design of a reproducible manufacturing process which allows the production of silicon lenses with high precision, high quality and high piece number. Furthermore a process for the production of diamond lenses is to be developed and established. In this work, the theoretical basics of x-rays and their interaction with matter are described. Especially, aspects of synchrotron radiation are emphasized. Important in x-ray microscopy are the different optics. The details, advantages and disadvantages, in particular those of refractive lenses are given. To achieve small x-ray beams well beyond the 100nm range a small focal length is required. This is achieved in refractive lenses by moving to a compact lens design where several single lenses are stacked behind each other. The, so-called nanofocusing refractive lenses (NFLs) have a parabolic cylindrical shape with lateral structure sizes in the micrometer range. NFLs are produced by using micro-machining techniques. These micro-fabrication processes and technologies are introduced. The results of the optimization and the final fabrication process for silicon lenses are presented. Subsequently, two experiments that are exemplary for the use of NFLs, are introduced. The first one employs a high-resolution scanning fluorescence mapping of a geological sample, and the second one is a coherent x-ray diffraction imaging (CXDI) experiment. CXDI is able to reconstruct the illuminated object from recorded coherent diffraction patterns. In a scanning mode, referred to as ptychography, this method is even able to reconstruct the illumination and the object simultaneously. Especially the reconstructed illumination and the possibility of computed propagation of the wavefield along the focused beam yields findings about the optic used. The collected data give interesting information about the lenses and their aberrations. Comparison of simulated and measured data shows good agreement. Following this, the fabrication process of diamond lenses is described. Diamond with its extraordinary properties is well-suited as lens material for refractive lenses. Finally, a concluding overview of the present and future work of nanofocusing lenses is given
Diese Dissertation beschäftigt sich mit der Entwicklung und Optimierung der Herstellungsprozesse von refraktiven nanofokussierenden Röntgenlinsen. Diese aus Silizium oder Diamant hergestellten Optiken, sind hervorragend für hochauflösende Röntgen\-mikroskopie geeignet. Ziel dieser Arbeit ist es, einen reproduzierbaren Herstellungsprozess zu erarbeiten, der es erlaubt, Siliziumlinsen von hoher Präzision, Qualität und Quantität zu fertigen. Zusätzlich soll ein Prozess für Diamantlinsen entwickelt und etabliert werden. In der folgenden Arbeit werden die theoretischen Grundlagen von Röntgenstrahlung und deren Wechselwirkung mit Materie beschrieben. Spezielle Aspekte der Synchrotronstrahlung werden hervorgehoben. Wichtig im Zusammenhang mit Röntgenmikroskopie sind die verschieden Optiken. Deren Details, Vor- und Nachteile, insbesondere die der brechenden Linsen, werden genannt. Zur Erzeugung fein gebündelter Röntgenmikrostrahlen im Bereich unter 100nm lateraler Größe benötigt man sehr kurze Brennweiten. Mit brechenden Linsen lässt sich dieses mittels eines kompakten Linsendesigns von vielen hintereinander gestapelten Einzellinsen realisieren. Die so genannten refraktiven nanofokussierenden Linsen (NFLs) besitzen eine parabolische Zylinderform mit lateralen Strukturgrößen im Mikrometerbereich. NFLs werden mittels spezieller Technologien der Mikroprozessierung hergestellt. Diese Mikrostrukturierungsverfahren werden mit ihren jeweiligen Prozessschritten und zugehörenden Technologien vorgestellt. Die Ergebnisse der Optimierung und der endgültige Mikrostrukturierungsprozess für Siliziumlinsen werden dargelegt. Im Anschluss daran werden zwei Experimente erläutert, die beispielhaft für die Anwendung von NFLs stehen. Ersteres ist ein ortsaufgelöstes Fluoreszenzrasterexperiment einer geologischen Probe und das zweite ein kohärentes Röntgen-Beugungsexperiment (CXDI). CXDI ist in der Lage, aus kohärent aufgenommen Beugungsbildern das beleuchtete Objekt zu rekonstruieren. Kombiniert mit einem rasternden Verfahren, welches Ptychographie genannt wird, ist diese Methode in der Lage, die Beleuchtungsfunktion und das Objekt gleichzeitig zu rekonstruieren. Besonderes die rekonstruierte Beleuchtungsfunktion und die Möglichkeit der computergestützten Propagation des Wellenfeldes entlang des fokussierten Strahls, geben aufschlussreiche Informationen über die verwendete Optik. Neue Erkenntnisse über die Linsen und deren Aberrationen können so gewonnen werden. Vergleiche von simulierten mit gemessenen Daten zeigen gute Übereinstimmung. Daran anschließend erfolgt die Beschreibung der Entwicklung eines Fabrikationsprozess für Diamantlinsen. Diamant mit seinen außergewöhnlichen Materialeigenschaften ist besonders gut als Linsenmaterial für refraktive Röntgenlinsen geeignet. Abschliessend wird ein zusammenfassender Überblick über die derzeitigen und die zu erwartenden Entwicklungen bei refraktiven Linsen gegeben
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Kraczek, Jeffrey R. "Non Iterative Multi-Aperture and Multi-Illuminator Phasing for High Resolution Coherent Imaging." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1500495301169035.

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Vacula, Daniel. "Automatizace metody měření povrchových struktur reflexním digitálním holografickým mikroskopem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228893.

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Reflected-light digital holographic microscope developed at IPE FME BUT uses off-axis holography principle and low spatial and temporal coherence illumination. Microscope allows reconstruction of the image amplitude and the image phase, which can be handled in real time. The only limiting factors are imaging speed of the detector and computer performance when processing holograms. Reconstruction of image phase and amplitude allows high-resolution profilometric measurements in the vertical axis direction. This thesis deals with the automatization of profilometric measurement method proposed in [2]. Proposed method uses the combination of the image phase and the image amplitude for the measurement of specimens with surface structure the vertical size of which cause the uncertainty of the image phase by a factor of 2pí. Futher the thesis deals with the construction design of the illumination system of the microscope and its realization together with experimental verification of functionality of proposed method automatization.
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Thouvenin, Olivier. "Optical 3D imaging of subcellular dynamics in biological cultures and tissues : applications to ophthalmology and neuroscience." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC169/document.

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Cette thèse a pour objectif l’étude d’un lien effectif potentiel entre la motilité cellulaire, la mécanique cellulaire, et l’activité biochimique de ces mêmes cellules. Ce couplage a été étudié dans divers systèmes biologiques, et aussi bien dans des cultures de cellules qu’à l’intérieur de tissus plus complexes. Notamment, nous avons particulièrement cherché à détecter un couplage électromécanique dans des neurones qui pourrait être impliqué dans la propagation du message nerveux.Pour ce faire, nous avons dû développer deux microscopes optiques à la sensibilité extrême. Ces microscopes se composent de deux parties principales. La première sert à détecter des mouvements axiaux plus petits que la longueur d’onde optique, soit en dessous de 100 nanomètres. La deuxième partie permet la détection d’un signal de fluorescence, offrant la possibilité de suivre l’évolution biochimique de la cellule. Avec ces deux microscopes multimodaux, il est donc possible de suivre de manière simultanée un contraste de motilité, un contraste mécanique, un contraste structurel et un contraste biochimique. Si l’un de ces systèmes est basé sur la tomographie de cohérence optique plein champ et permet de faire de telles mesures en 3-D et en profondeur dans les tissus biologiques, le second ne permet que des mesures dans des cultures de cellules, mais est bien plus robuste au bruit mécanique. Dans ce manuscrit, nous allons essentiellement décrire le développement de ces deux appareils, et préciser les contrastes auxquels ils sont sensibles spécifiquement.Nous développerons également deux des applications principales de ces microscopes que nous avons étudié dans le détail au cours de cette thèse. La première application développe l’intérêt d’un de nos microscopes pour la détection sans marquage des principaux composants cellulaires et structuraux de la cornée et de la rétine. La seconde application tend à détecter et à suivre des ondes électromécaniques dans des neurones de mammifères
This PhD project aims to explore the relationship that might exist between the dynamic motility and mechanical behavior of different biological systems and their biochemical activity. In particular,we were interested in detecting the electromechanical coupling that may happen in active neurons, and may assist in the propagation of the action potential. With this goal in mind, we have developed two highly sensitive optical microscopes that combine one modality that detects sub-wavelength axial displacements using optical phase imaging and another modality that uses a fluorescence path. Therefore, these multimodal microscopes can combine a motility, a mechanical,a structural and a biochemical contrast at the same time. One of this system is based ona multimodal combination of full-field optical coherence tomography (FF-OCT) and allows the observation of such contrast inside thick and scattering biological tissues. The other setup provides a higher displacement sensitivity, but is limited to measurements in cell cultures. In this manuscript, we mainly discuss the development of both systems and describe the various contrastst hey can reveal. Finally, we have largely used our systems to investigate diverse functions of the eye and to look for electromechanical waves in cell cultures. The thorough description of both biological applications is also provided in the manuscript
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Meiniel, William. "Développement et mise en oeuvre de stratégies d'échantillonnage comprimé pour le débruitage et l'acquisition d'images en microscopie à fluorescence et en tomographie en cohérence optique." Electronic Thesis or Diss., Paris, ENST, 2018. http://www.theses.fr/2018ENST0052.

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Dans le cadre de la théorie mathématique de l’échantillonnage comprimé (Compressed Sensing, CS), développée récemment, il est possible de reconstruire un signal ou une image à partir de très peu d’acquisitions. Dans cette thèse, nous étudions comment cette théorie peut être adaptée à deux techniques de microscopie optique : la microscopie à fluorescence, et la tomographie en cohérence optique. Ces deux technologies présentent chacune des limitations, qui peuvent être corrigées par prise en compte de stratégies d’échantillonnage comprimé, que l’on peut diviser en deux catégories : des solutions algorithmiques propres au traitement d’image, et des techniques d’acquisition optique
The mathematical theory of Compressed Sensing (CS) is a recently developed framework that enables the reconstruction of a signal or an image from very few measurements. In this thesis, we investigate how this theory can be implemented in the context of two optical microscopy techniques : fluorescence microscopy, and optical coherence tomography. Both technologies present different limitations which we prove can be tackled by the embedding of CS driven strategies. The latter can be divided into two categories : image processing algorithmic solutions, and optical acquisition techniques
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Maršíková, Barbora. "Trojrozměrné zobrazování v holografickém mikroskopu pomocí koherenční brány." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-392840.

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Tato diplomová práce se zabývá výzkumem na téma vlivu prostorové koherence osvětlení. Účelem je určit schopnost osové lokalizace při zobrazení Koherencí řízeným holografickým mikroskopem (CCHM) v závislosti na různé prostorové koherenci světelného zdroje. Osová lokalizace je v tomto případě zkoumána jako kvalita rozlišení drobných detailů trojrozměrného vzorku, umístěných nad sebou. Teorie zobrazení holografickým mikroskopem a teorie rozptylu v nehomogenních prostředích je shrnuta v první části práce, v rozsahu nutném pro pochopení části praktické. Základní princip fungování mikroskopu a přesný popis jeho uspořádání je zde podrobně popsán. Proběhl mechanický návrh stavební úpravy mikroskopu tak, aby bylo možno využívat kondenzorovou optiku s vysokou numerickou aperturou a omezenými optickými vadami. Několik různých přístupů, které by mohly vést ke zlepšení zobrazovacích vlastností mikroskopu, bylo navrženo a vyzkoušeno a jsou zde popsány i s jejich výhodami a nevýhodami. Pro experimentální část práce byl vyroben modelový vzorek. Závislost osové lokalizace na prostorové koherenci osvětlení byla demonstrována pomocí simulace a následně ověřena experimentálně, pozorováním vyrobeného modelového vzorku. Experimentální výsledky potvrzují základní principy vycházející ze zmíněné teorie. Na závěr jsou navržena možná vylepšení, pro budoucí zpřesnění výsledků.
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Books on the topic "Coherent Illumination"

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Taylor, David K. Non-coherent optical radiation sources. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199655212.003.0022.

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Optical radiation is ubiquitous, and intense artificial sources find many applications in clinical practice, including zone illumination, diagnosis, and therapy. Its effects on humans are strongly wavelength-dependent, its hazards sometimes overlooked due to familiarity or masking by other wavelengths. This chapter examines non-laser sources of ultraviolet, visible, and infrared radiations, the risks likely to be encountered in clinical settings, the calculations needed to assess commonly encountered optical radiation sources, and the measures that can be taken to minimize the hazards to workers and patients, in compliance with the requirements of the Artificial Optical Radiation directive.
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Cho, Jeasik. A Typology of the Evaluation of Qualitative Research. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199330010.003.0002.

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This chapter explores five specific categories of the evaluation of qualitative research (EQR): (1) a general EQR category for a universal set of criteria for any type of qualitative research; (2) a “subtle realist” category that does not necessarily give up on positivist aims while drawing on the insights of constructivist conceptions of social research; (3) a post-criteriology category that views as an impossibility setting up predetermined criteria for qualitative research that uncovers complex meaning-making processes; (4) an art-based research category that consists of six criteria—incisiveness, concision, coherence, generativity, social significance, and evocation and illumination—that serve as a cue for perception that assists audiences in making a better evaluation of an art product; and (5) a post-validity category seeking out openly ideological evaluation criteria. The author’s holistic view of EQR, underpinning a beehive metaphor, is presented as neither unitary nor paradigm-idiosyncratic.
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Book chapters on the topic "Coherent Illumination"

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Ojeda-Castañeda, Jorge. "Optical Linear Systems Under Coherent Illumination." In Wavefront Shaping and Pupil Engineering, 39–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-63802-6_3.

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Berberova, Natalia, Elena Stoykova, Hoonjong Kang, Joo-Sup Park, and Branimir Ivanov. "SLM-Based Fringe Projection Profilometry under Coherent Illumination." In Fringe 2013, 883–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36359-7_164.

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Alhakamy, A’aeshah, and Mihran Tuceryan. "Polarization-Based Illumination Detection for Coherent Augmented Reality Scene Rendering in Dynamic Environments." In Advances in Computer Graphics, 3–14. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22514-8_1.

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Agour, Mostafa, Khaled Elshaffey, Christoph von Kopylow, Ralf B. Bergmann, and Claas Falldorf. "Measuring the Complex Amplitude of Wave Fields by Means of Phase Retrieval Using Partially Coherent Illumination." In Fringe 2013, 283–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36359-7_47.

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Domash, L., P. Levin, and M. A. Fiddy. "Fluctuation Interferometer as High Angular-Resolution Sensor of Laser Illumination." In Coherence and Quantum Optics VI, 237–41. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0847-8_44.

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Napieralski, Piotr. "Optimal Frame Coherence for Animation in Global Illumination Environment." In Studies in Computational Intelligence, 187–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78490-6_23.

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"Computational Lithography with Coherent Illumination." In Computational Lithography, 58–82. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470618943.ch5.

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"Computational Lithography with Partially Coherent Illumination." In Computational Lithography, 101–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470618943.ch7.

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"Diffuse Global Illumination with Temporally Coherent Light Propagation Volumes." In GPU Pro 2, 203–22. A K Peters/CRC Press, 2016. http://dx.doi.org/10.1201/b11325-19.

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Frank, Joachim. "The Envelope of Electron Microscopic Transfer Functions for Partially Coherent Illumination." In Series in Structural Biology, 51–68. World Scientific, 2018. http://dx.doi.org/10.1142/9789813234864_0003.

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Conference papers on the topic "Coherent Illumination"

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Boufounos, Petros T. "Depth sensing using active coherent illumination." In ICASSP 2012 - 2012 IEEE International Conference on Acoustics, Speech and Signal Processing. IEEE, 2012. http://dx.doi.org/10.1109/icassp.2012.6289146.

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Kozacki, Tomasz, Marcin Prytulak, and Romuald Jóźwicki. "Partially coherent illumination in Fresnel digital holography." In Congress on Optics and Optoelectronics, edited by Krzysztof M. Abramski, Antonio Lapucci, and Edward F. Plinski. SPIE, 2005. http://dx.doi.org/10.1117/12.622867.

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Hu, Jiajun. "Autostereoscopic display with a coherent backlight illumination." In Frontiers in Optics. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/fio.2020.fm5d.5.

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Schneider, Bernhard, Benno Albrecht, P. Jaeckle, Denis Neofotistos, S. Soeding, T. Jaeger, and Christoph G. Cremer. "Nanolocalization measurements in spatially modulated illumination microscopy using two coherent illumination beams." In BiOS 2000 The International Symposium on Biomedical Optics, edited by Daniel L. Farkas and Robert C. Leif. SPIE, 2000. http://dx.doi.org/10.1117/12.384227.

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Zhang, Bosheng, Dennis F. Gardner, Leigh S. Martin, Matthew D. Seaberg, Daniel E. Adams, Margaret Murnane, and Henry Kapteyn. "Coherent Diffraction Imaging with an Apertured Illumination Support." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/cleo_si.2012.cf1l.4.

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Sharma, Nachieketa K., K. Mishra, S. K. Kamilla, and J. K. Sharma. "Performance of a human eye in coherent illumination." In 2013 Workshop on Recent Advances in Photonics (WRAP). IEEE, 2013. http://dx.doi.org/10.1109/wrap.2013.6917630.

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Srinivasan, Pratul P., Ben Mildenhall, Matthew Tancik, Jonathan T. Barron, Richard Tucker, and Noah Snavely. "Lighthouse: Predicting Lighting Volumes for Spatially-Coherent Illumination." In 2020 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2020. http://dx.doi.org/10.1109/cvpr42600.2020.00810.

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Heemels, Alexander, Temitope E. Agbana, Silvania F. Pereira, Jan-Carel Diehl, Michel Verhaegen, and Gleb Vdovin. "Effect of partial coherent illumination on Fourier Ptychography." In Label-free Biomedical Imaging and Sensing (LBIS) 2020, edited by Natan T. Shaked and Oliver Hayden. SPIE, 2020. http://dx.doi.org/10.1117/12.2544766.

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Schwider, Johannes. "Partially coherent illumination in interferometry for optical testing." In International Conference on Optical Metrology, edited by Werner P. O. Jueptner and Krzysztof Patorski. SPIE, 1999. http://dx.doi.org/10.1117/12.357761.

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Guan, Yizhao, Hiromasa Kume, Shotaro Kadoya, Masaki Michihata, and Satoru Takahashi. "The FDTD Analysis of Near-Field Response for Microgroove Structure With Standing Wave Illumination for the Realization of Coherent Structured Illumination Microscopy." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-60409.

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Abstract Microstructures are widely used in the manufacture of functional surfaces. An optical-based super-resolution, non-invasive method is preferred for the inspection of surfaces with massive microstructures. The Structured Illumination Microscopy (SIM) uses standing-wave illumination to reach optical super-resolution. Recently, coherent SIM is being studied. It can obtain not only the super-resolved intensity distribution but also the phase and amplitude distribution of the sample surface beyond the diffraction limit. By analysis of the phase-depth dependency, the depth measurement for microgroove structures with coherent SIM is expected. FDTD analysis is applied for observing the near-field response of microgroove under the standing-wave illumination. The near-field phase shows depth dependency in this analysis. Moreover, the effects from microgroove width, the incident angle, and the relative position between the standing-wave peak and center of the microgroove are investigated. It is found the near-field phase change can measure depth until 200 nm (aspect ratio 1) with an error of up to 20.4 nm in the case that the microgroove width is smaller than half of the wavelength.
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Reports on the topic "Coherent Illumination"

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Ravizza, F. L. Imaging of Phase Objects using Partially Coherent Illumination. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1122248.

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