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Capteurs A Fibre Optique Bases Sur La Reflexion De Fresnel
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Book Synopsis Capteurs à fibre optique basés sur la réflexion de Fresnel by : Antoine Brientin
Download or read book Capteurs à fibre optique basés sur la réflexion de Fresnel written by Antoine Brientin and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La mesure de l'indice optique d'un milieu est un moyen d'obtenir des informations comme les éléments chimiques qui le composent, sa température ou sa pression. Le capteur dit de Fresnel, basé sur la mesure de la puissance réfléchie à l'extrémité d'une fibre optique monomode, est un moyen simple de réaliser des mesures d'indice optique, et est adapté à des mesures in-situ de réticulation ou de teneur en eau dans des structures composites. Néanmoins, ce capteur ponctuel ne permet de faire des mesures que sur une petite zone à l'extrémité de la fibre, le rendant très sensible aux perturbations locales. Cette thèse étudie la possibilité d'utiliser des structures de fibres spéciales en tant que capteur de Fresnel, d'un point de vue théorique et expérimental, afin d'élargir le champ de mesures possibles. Les fibres optiques biréfringentes sont d'abord considérées, avec l'objectif de réaliser des mesures d'anisotropie optique. Les fibres multimodes sont ensuite étudiées afin d'augmenter sensiblement le volume de mesure grâce à leur diamètre de coeur important, et de valider l'emploi de fibres plastiques à bas coût en tant que capteur de Fresnel. Enfin, l'utilisation de la spectroscopie sur un capteur de Fresnel est envisagée, avec l'objectif d'utiliser les possibles bandes d'absorption dans un milieu pour obtenir des informations supplémentaires sur ce dernier, ou bien de prendre en compte la diffusion de la lumière par des particules situées à l'extrémité de la fibre.
Book Synopsis Développement de capteurs à fibre optique basés sur la résonance de plasmon de surface pour la détection physique, chimique et biologique by : Wenbin Lin
Download or read book Développement de capteurs à fibre optique basés sur la résonance de plasmon de surface pour la détection physique, chimique et biologique written by Wenbin Lin and published by . This book was released on 2000 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Il est bien connu que la résonance de plasmon de surface (SPR) d'une onde électromagnétique de surface peut être utilisée en tant que sonde optique sensible à de faibles variations intervenant à l'interface métal/diélectrique. La configuration de Kreschmann basée sur un prisme est traditionnellement employée pour exciter et détecter le phénomène SPR. En 1993, le premier capteur SPR à fibre optique a été réalisé par R.C. Jorgenson et S.S. Yee et a été ensuite commercialisé par la société Biacore (Suède). Le capteur SPR à fibre optique présente un certain nombre d'avantages sur le système Kreschmann tels que sa faible taille, son faible coût et la possibilité de détection déportée. Un capteur SPR à fibre optique multimodale plus simple, utilisant l'injection oblique d'une lumière monochromatique collimatée, a été développé au laboratoire TSI de l'université Jean-Monnet de Saint-Etienne, en 1996. Utilisant l'argent pour induire le phénomène SPR d'une lumière à la longueur d'onde 670 nm, le capteur à fibre optique est un réfractomètre fonctionnant dans la gamme d'indice optique 1,35-1,40. Ce mémoire de thèse est constitué de cinq articles visant à développer ce type de capteur à fibre optique pour les applications physique, chimique et biologique. Le premier article traite de la modification de la gamme d'indice mesurable, afin d'être capable de fonctionner dans des systèmes chimiques et biologiques, dont les indices de réfraction sont compris entre 1,33 et 1,36. Les relations entre les paramètres de structure et de matériau, de la configuration multicouche pour l'excitation du SPR, ont été déduites de la théorie. La technique sol-gel est utilisée pour fabriquer un revêtement d'acétate de zirconium de quelques dizaines de nanomètres. La fiabilité est augmentée par une protection constituée d'une monocouche auto-assemblée de thiol longue chaîne qui empêche l'oxydation de l'argent. Ce premier article a été soumis à la revue Thin Solid Films. Les variations spatiales du vecteur champ électrique au cours de la propagation des rayons non méridiens dans la fibre multimodale sont étudiées dans le second article accepté pour publication dans la revue Sensors and Actuators A. Un modèle 3D précis a été établi permettant d'expliquer le phénomène expérimental observé sur l'influence de la direction de polarisation de la lumière incidente par rapport à la face d'entrée de la fibre. Les signaux du capteur provenant de l'adsorption d'une très fine couche diélectrique sur la surface du métal ou d'une très faible variation de l'indice de réfraction dans le milieu de mesure peuvent alors être interprétés quantitativement. L'article suivant, accepté pour publication à la revue Applied Optics, propose une méthode directe pour déterminer l'épaisseur et les constantes optiques d'un film mince de métal déposé sur le cœur de la fibre, par simple mesure de la réponse du capteur à fibre optique. L'intérêt de ce travail vient des difficultés rencontrées dans la caractérisation des films métalliques avec des surfaces courbes en utilisant des techniques optiques conventionnelles telles que la réflectométrie et l'ellipsométrie. Un nouveau moyen optique capable de suivre in-situ la formation d'une monocouche auto-assemblée d'alkylthiol est présenté dans le quatrième article, soumis au Journal of Chemical Physics. L'application de la technique SPR à fibre optique pour étudier les monocouches auto-assemblées, l'observation directe et la description du phénomène d'inclinaison des chaînes lors de l'auto-assemblage de la monocouche d'alkylthiol, à notre connaissance, n'a jamais été rapporté auparavant dans la littérature. La bonne sensibilité observée montre que notre approche du système à fibre optique est plus adaptée que l'ellipsométrie et que le système SPR à prisme pour suivre les variations sur la totalité d'un film diélectrique. Le dernier article, soumis au Japanese Journal of Applied Physics, est consacré au développement d'un biocapteur basé sur le système à fibre optique pour suivre des interactions entre biomolécules. Avec une très simple configuration, cet immunocapteur a montré de bonnes performances en sensibilité et en spécificité, comparé à l'appareil commercialisé par Biacore qui est beaucoup plus complexe et cher. Ce travail constitue un excellent départ vers le développement d'une immunosonde pour des immunoessais sans marqueur. Ces cinq articles sont indépendants mais complémentaires l'un de l'autre. Les conditions pour lesquelles le SPR peut être excité sur une géométrie multicouche, obtenues dans le premier article, fournissent une base théorique pour le choix de la longueur d'onde de la lumière ou pour la gamme d'indice du milieu environnant lorsque l'or est utilisé et se retrouve dans les autres articles. Les études du modèle 3D précis, présenté dans le second article, pour simuler les performances des capteurs à fibre optique, permettent ensuite de caractériser le film métallique (dans le troisième article), la couche chimique adsorbée (dans le quatrième article) et les couches biomoléculaires (dans le cinquième article). De plus, la mesure des propriétés du film métallique dans le troisième article, permet de détecter avec succès, la monocouche auto-assemblée d'alkylthiol adsorbée sur la surface du métal (en référence au quatrième article). Les déterminations des caractéristiques du film d'or et de la couche de thiol sont nécessaires pour caractériser le film d'anticorps et la couche d'anticorps-antigène après la réaction d'affinité. Un biocapteur basé sur un système SPR à fibre optique a donc été réalisé et est présenté dans le cinquième article. Ce biocapteur a été conçu, élaboré et caractérisé couche par couche.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Experimental Chaos by : Stefano Boccaletti
Download or read book Experimental Chaos written by Stefano Boccaletti and published by A I P Press. This book was released on 2004-12-14 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 8th Experimental Chaos Conference again demonstrated the broad spectrum of areas where nonlinear dynamics plays an important role, such as circuits, hydrodynamics, optics, chemistry, fracture dynamics, neuroscience, and cognitive science. Additional contributions outline the trends for development and application of concepts and techniques of nonlinear dynamics.
Book Synopsis Monitoring soils in the environment with remote sensing and gis by : Richard Escadafal
Download or read book Monitoring soils in the environment with remote sensing and gis written by Richard Escadafal and published by IRD Orstom. This book was released on 1996 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: ISSS congress remote sensing
Book Synopsis Fundamental Interactions and Cosmology by : J. AUDOUZE (Ed)
Download or read book Fundamental Interactions and Cosmology written by J. AUDOUZE (Ed) and published by Atlantica Séguier Frontières. This book was released on 1985 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to ISDN written by and published by Wiley-Blackwell. This book was released on 1987 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organic Solid-State Lasers by : Sébastien Forget
Download or read book Organic Solid-State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Book Synopsis Building Wireless Community Networks by : Rob Flickenger
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Author :Food and Agriculture Organization of the United Nations. Land and Water Development Division Publisher :Food & Agriculture Org. ISBN 13 :9789251034293 Total Pages :136 pages Book Rating :4.0/5 (342 download)
Book Synopsis Global and National Soils and Terrain Digital Databases (SOTER) by : Food and Agriculture Organization of the United Nations. Land and Water Development Division
Download or read book Global and National Soils and Terrain Digital Databases (SOTER) written by Food and Agriculture Organization of the United Nations. Land and Water Development Division and published by Food & Agriculture Org.. This book was released on 1993 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Book Synopsis Immersion in the Visual Arts and Media by :
Download or read book Immersion in the Visual Arts and Media written by and published by BRILL. This book was released on 2015-10-27 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taking an interdisciplinary approach, this volume brings together contributions by distinguished experts from different disciplinary fields for a multidimensional view on immersion in the visual arts and media. In the current media debate, immersion has frequently been linked to the advent of digital technology and its capacity to provide vivid sensations of being placed in or surrounded by an artificial space. The idea of ‘liquidity’ contained in this promise to plunge into another world informs wide areas of contemporary cultural imagination, referring to a myriad of phenomena that relate to experiences of uncertainty and instability, of complexity and change. Considering the fact, however, that the idea of ‘liquid’ spaces appeared long before the digital creation of augmented or virtual environments, the contributors to this volume trace its reemerging throughout the history of the visual arts and media. By focusing on selected works of painting and architecture, photography and cinema, video installation and media art, they explore the variability of immersive experiences according to the different media environments and interfaces that constitute the actual sites of historically shifting relations between media and users. Contributors are: Matthias Bauer, Jörg von Brincken, Robin Curtis, Burcu Dogramaci, Thomas Elsaesser, Ole W. Fischer, Gundolf S. Freyermuth, Ursula Frohne, Henry Keazor, Matthias Krüger, Katja Kwastek, Fabienne Liptay, Karl Prümm, Martin Warnke.
Book Synopsis Laser: 50 Years Of Discoveries by : Fabien Bretenaker
Download or read book Laser: 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
Book Synopsis Visuality/Materiality by : Divya P. Tolia-Kelly
Download or read book Visuality/Materiality written by Divya P. Tolia-Kelly and published by Routledge. This book was released on 2016-02-11 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two of the key theoretical shifts over the past two decades of critical work have been the 'visual turn' and the 'material turn'. This book argues that these hitherto distinct fields should be understood as in continual dialogue and co-constitution and focuses on reconceptualising the visual as an embodied, material, and often politically-charged realm. This edited volume elaborates this conceptual argument through a series of contemporary case studies, drawn from the disciplines of Architecture, Sociology, Media Studies, Geography and Cultural Studies. The case studies included are paired around four themes: consumption, translation, practice and ethics. As well as exploring the bringing together of visuality and materiality studies, the contributors raise questions of social identity and social critique, and also focus on the ethics of material visualities.
Download or read book Virtual Voyages written by Jeffrey Ruoff and published by Duke University Press. This book was released on 2006-01-24 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIVThe different forms that travelogues have taken (documentaries, IMAX, home movies, ethnographic films) from the 1800s to the present./div
Book Synopsis Shivers Down Your Spine by : Alison Griffiths
Download or read book Shivers Down Your Spine written by Alison Griffiths and published by Columbia University Press. This book was released on 2013-04-23 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the architectural spectacle of the medieval cathedral and the romantic sublime of the nineteenth-century panorama to the techno-fetishism of today's London Science Museum, humans have gained a deeper understanding of the natural world through highly illusionistic representations that engender new modes of seeing, listening, and thinking. What unites and defines many of these wondrous spaces is an immersive view-an invitation to step inside the virtual world of the image and become a part of its universe, if only for a short time. Since their inception, museums of science and natural history have mixed education and entertainment, often to incredible, eye-opening effect. Immersive spaces of visual display and modes of exhibition send "shivers" down our spines, engaging the distinct cognitive and embodied mapping skills we bring to spectacular architecture and illusionistic media. They also force us to reconsider traditional models of film spectatorship in the context of a mobile and interactive spectator. Through a series of detailed historical case studies, Alison Griffiths masterfully explores the uncanny and unforgettable visceral power of the medieval cathedral, the panorama, the planetarium, the IMAX theater, and the science museum. Examining these structures as exemplary spaces of immersion and interactivity, Griffiths reveals the sometimes surprising antecedents of modern media forms, suggesting the spectator's deep-seated desire to become immersed in a virtual world. Shivers Down Your Spine demonstrates how immersive and interactive museum display techniques such as large video displays, reconstructed environments, and touch-screen computer interactives have redefined the museum space, fueling the opposition between public and private, science and spectacle, civic and corporate interests, voice and text, and life and death. In her remarkable study of sensual spaces, Griffiths explains why, for centuries, we keep coming back for more.
Download or read book PC ARCPLOT written by and published by . This book was released on 1994 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
