61. Augustin Fresnel Translate this page augustin fresnel le génie des phares. Polytechnicien à 16 ans, cetingénieur des Ponts et Chaussées se voit décerner en 1819 http://hebergement.ac-poitiers.fr/c-font-niort/site_eleves_1/pages/phares/fresne

Augustin Fresnel le génie des phares Polytechnicien à 16 ans, cet ingénieur des Ponts et Chaussées se voit décerner en 1819 un prix de l'académie pour ses travaux sur la diffraction. Recommandé par Arago, il devient alors membre de la commission des phares et travaille immédiatement à un projet de remplacement des réflecteurs paraboliques par de grandes lentilles de verre. 18 mois plus tard sera décidé la réalisation à titre expérimental, d'une lentille complète destinée au phare de Cordouan. Quand dans la nuit du 20 au 21 juillet 1823, le nouveau feu fut inauguré, sa puissance fit croire aux habitants qu'un incendie s'était allumé. Il avait si bien pensé son invention qu'aucune amélioration n'a pu lui être apportée, et qu'aucune découverte n'a permis de substituer un autre système aux lentilles qui portent encore aujourd'hui son nom. I l est décédé à l'âge de 39 ans

62. The Object At Hand - Science Makes A Better Lighthouse Lens revolutionary breakthrough. His name was augustin Jean fresnel. all night.But the greatest innovation was to come from augustin fresnel. http://www.smithsonianmag.si.edu/smithsonian/issues99/aug99/object_aug99.html

The Lantern Room: Photographs of Fresnel Lenses PBS Online: Legendary Lighthouses The Lighthouse Getaway The Mariner's Museum Science Makes a Better Lighthouse Lens From that time until the 18th century, the lights that warned ships that they were approaching land improved hardly at all. Some burned coal. Others stuck with wood. Oil lamps backed by mirrors eventually offered a bit more candlepower. Still, every coastline in the world remained littered with the ribs of broken ships whose captains didn't see the lighthouse until it was too late. Then, in 1822, a frail scientist with a passion for optics made a revolutionary breakthrough. His name was Augustin Jean Fresnel. An example of his greatest creation, a large object that looks like a crystalline beehive, may be seen inside the Hall of American Maritime Enterprise at the National Museum of American History. It towers above the museum's displays of ship models and marine artifacts. This is the Fresnel lens, not one lens really, but numerous tiers of prisms. Lenses like this one turned simple flames into beams upon which sea captains could take their bearings, avoiding risk to their ships and to the lives of their passengers. As big as it seems, by lighthouse standards the Smithsonian glass beehive is just above average, measuring nearly six feet high and more than three feet wide. It was installed in the famous Bolivar Lighthouse overlooking Galveston, Texas, sometime around 1907. This lighthouse served as sentry, and for some as sanctuary, during the deadliest hurricane in American history. The lens is visible proof that unlike the sea, light can be mastered by human ingenuity.

63. Le Canton De Broglie : Biographie D'Augustin Fresnel Translate this page augustin fresnel. Jean augustin fresnel (1788-1827) Fondateur de l'optiquemoderne. A Broglie, nous devons la rue augustin fresnel http://www.broglieweb.com/contenu/histoire/histoire.asp?id_contenu=35

64. The Science Bookstore - Chronology fresnel, augustin Born 5/10/1788, 1788 AD, 1818 AD, fresnel, A. Transverselight waves augustinJean fresnel. 1822 AD, fresnel, A. Lighthouse http://www.thesciencebookstore.com/chron.asp?searchstring=Fresnel

65. Augustin Fresnel (1788-1827) Translate this page 1773-1829) augustin fresnel (1788-1827). fresnel não era um acadêmicode formação, mas engenheiro de pontes e calçadas. Criou http://euclides.if.usp.br/~fmt405/apostila/oticaonda/node6.html

Next: Referências Up: História da Ótica Previous: Thomas Young (1773-1829) Augustin Fresnel (1788-1827) Fresnel não era um acadêmico de formação, mas engenheiro de pontes e calçadas. Criou alguns artefatos engenhosos em ótica, como a ``lente de Fresnel'', utilizada para direcionar a luz em faróis de sinalização marítima. Acreditava que a luz pudesse ser produzida graças a um fluido capaz de transmitir vibrações. Supôs que a hipótese corpuscular fora a mais aceita devido apenas à maior complexidade da matemática envolvida na descrição dos movimentos ondulatórios de um meio contínuo. É curioso notar que não havia lido Newton, Huyghens, Malus (descobridor da polarização da luz) ou Young. Em 1814, participa de conflitos políticos na França e é retido em prisão domiciliar. Ele tem enfim o tempo para se dedicar ao problema da luz. Reproduziu a experiência da difração por um fio de cabelo, observando as franjas. Se convenceu, com este experimento, da impossibilidade da teoria corpuscular. Fresnel busca orientação bibliográfica em Arago (que já lera o trabalho de Young), que recomenda leitura de Grimaldi, Newton e Young. Mas Fresnel não sabe inglês ou latim, e não chega a tomar contato com a obra de Young. Fresnel deduz os efeitos decorrentes de uma teoria ondulatória da luz, a partir de umas poucas hipóteses fundamentais:

66. Augustin Fresnel Translate this page Fiche ONISEP Lycée public augustin fresnel 14 rue K.Mercier BP 161 tél. 02 3247 32 40 - internat G/F. SECONDE GENERALE ET TECHNOLOGIQUE. augustin fresnel. http://www.ac-rouen.fr/colleges/corneille/orientation/lycee_eure/fresnel.htm

Bernay cedex 27 301 lycée Augustin Frenel (Infos : ce site a été réalisé par des élèves de 3 ème du Collège Pierre Corneille " 27110 Le Neubourg " et par conséquent ne dispose pas des informations concernant le lycée nommé ci-dessus. Pour de plus amples informations il est souhaitable de téléphoner au numéro ci-dessous ou cliquer sur le lien Internet s'il existe.) Département : EURE 27 Fiche ONISEP Lycée public Augustin Fresnel 14 rue K.Mercier B.P 161 tél.: 02 32 47 32 40 - internat G/F SECONDE GENERALE ET TECHNOLOGIQUE LV1 : anglais - allemand Enseignements de détermination Baccalauréats : Sciences économiques et sociales Informatique de gestion et de communication Latin Grec anglais - allemand - espagnol allemand - espagnol option facultative : musique Economique et social Littéraire Scientifique Sciences et technologies tertiaires * action communication administratives * comptabilité et gestion * action et communication commerciales 1 ère d'adaptation tertiaire gestion-action administrative et comptable Etudes supérieures Brevet de Technicien Supérieur 25/25 BTS assistant de production PME-PMI Prépa 18/25 Diplôme préparatoire aux études comptables et financières lien vers le site du lycée Augustin Fresnel Retour début de la fiche Pour toutes questions ou problèmes concernant ce site Web, contacter le

67. Fresnel, Augustin Jean encyclopediaEncyclopedia fresnel, augustin Jean, OgüstaN' zhäN frAnel' PronunciationKey. fresnel, augustin Jean 1788–1827, French physicist and engineer. http://www.factmonster.com/ce6/people/A0819685.html

Encyclopedia Fresnel, Augustin Jean O A Pronunciation Key Fresnel, Augustin Jean , French physicist and engineer. He is known for his research on light, especially on conditions governing interference phenomena in polarized light and on double refraction. His work supported the wave theory of light and the concept of transverse vibrations in light waves, which he analyzed mathematically. He devised a method of producing circularly polarized light and promoted the replacement of mirrors with compound lenses in lighthouses. He served as a government engineer during most of his career. Freshfield, Douglas William Fresnillo AD AD AD AD AD Print this page Cite this page Awards and Press Link to Fact Monster Add Fact Monster search ... Privacy

68. Augustin Fresnel augustin fresnel (17881827). fresnel was educated at the Ecole Polytechniqueand was active in the Corps des Ponts et Chaussées. http://www.fys.kuleuven.ac.be/pradem/fysici/Fresnel.html

Pradem Leuven Demo's Applets Laboproeven ... Zoeken Augustin Fresnel (1788-1827) Fresnel was educated at the Ecole Polytechnique and was active in the Corps des Ponts et Chaussées. He lost his engineering post temporarily during Napoleon's return from Elba in 1814 and around this time he did important work on optics where he was one of the founders of the wave theory of light. By applying mathematical analysis to his work Fresnel removed many of the objections to the wave theory of light. With Arago he rediscovered interference of polarised light and gave a theory of diffraction of light. He obtained circularly polarised light and developed the use of compound lenses instead of mirrors for lighthouses. Article by: J J O'Connor and E F Robertson Pradem Leuven Premonstreitcollege Plan Naamsestraat 61 3000 Leuven Opmaak: Tony Verheyden Laatste wijziging: 22-aug-02

69. Fyrteknikens Historia augustin Jean fresnel. Uppfinningarna för att förbättra lyskapaciteten börjadeströmma in med högre frekvens allteftersom kravet på fyrarna ökade. http://www.dd.chalmers.se/~thomasso/sid4.html

Augustin Jean Fresnel Uppfinningarna för att förbättra lyskapaciteten började strömma in med högre frekvens allteftersom kravet på fyrarna ökade. Sedan ångfartygens genombrott blev sjötrafiken allt livligare på natten och det blev nödvändigt att kunna se fyrars trygga blinkningar även på mer än 20 sjömils avstånd. En av lösningarna som man trodde på var att samla ljuset genom en lins istället för att låta det reflekteras mot en parabol. Problemet som uppstod var att man med dåtidens teknik omöjligt kunde framställa en sådan enorm samlingslins, som skulle krävas.En epokgörande man inom fyroptiken blev fransmannen Augustin Jean Fresnel när han kom med lösningen på detta. Hans "Fresnellins" är en genialisk förenkling av den annars mycket otympligare samlingslinsen. Han kom fram till att man kunde "skala av" onödiga delar av linsen och ändå få samma brytningsförmåga. Genom att bygga upp en lins i skikt, där varje skikt för sig har den krökning som krävs för att bryta ljuset i önskvärd riktning, lyckades han konstruera en platt lins som blev en oerhörd förenkling jämfört med den lins som annars skulle ha krävts. Denna lins släppte ifrån sig fyra gånger mer ljus än parabolen, då den bara absorberade 10% av det ljus som passerade. Liksom hos Norberg roterade denna apparat runt sin vertikala axel och genererade på så sätt blinksignaler. Den installerades första gången 1823 i Cordouanfyren vid Bourdeax i Frankrike. Nästa konstruktion Fresnel gav upphov till var den så kallade trumlinsen. Den består av horisontella prismaringar vars uppgift är att bryta det utgående ljuset i alla horisontella riktningar. Detta ger ett konstant ljus istället för blinkningskaraktären, vilket är önskvärt i till exempel sektorfyrar.

70. Service éducatif Des Archives Départementales Du Calvados : Augustin Fresnel Translate this page Cahier pédagogique augustin fresnel, Archives Départementales du Calvados,Service éducatif. © ADC, augustin fresnel, 1788 - 1827. Les http://www.etab.ac-caen.fr/map/servicesEduc/fresnel.htm

Augustin Fresnel, 1788 - 1827. Pierre-Simon de Laplace Sommaire. Chronologie Biographie d'Augustin Fresnel. Naissance L'Ecole centrale de Caen : les locaux, les programmes L'oeuvre scientifique. Le contexte scientifique au temps de Fresnel Augustin Fresnel fondateur de l'optique moderne Fresnel aujourd'hui Bibliographie. Collaboration : Sylvain Bouvet Photographie : Pascal Sellin

71. Physicists fresnel, augustin Jean (17881827) French physicist augustin Jean fresnel madethe first calculation of diffraction patters from various obstacles. http://www.physics.nwu.edu/ugrad/vpl/physicists.html

Physicists Index Atomic Physics Mechanics Optics ... Waves Brewster, David Sir David Brewster made the first empirical determination of what is now know as Brewster's angle in 1812. Descartes, Rene Rene Descartes was the first to publish the law of refraction in terms of sines. Fermat, Pierre de Pierre de Fermat formulated the now famous principle of least time in 1657. Fresnel, Augustin Jean French physicist Augustin Jean Fresnel made the first calculation of diffraction patters from various obstacles. Galilei, Galileo Galileo Galilei was an Italian astronomer, physicist, and mathematician, is the father of kinematics. After building one of the first telescopes, Galileo discovered four moons of Jupiter in 1610. Huygens, Christiaan Dutch physicist Christiaan Huygens, discovered the phenomena of polarization, derived the laws of reflection and refraction, and formulated what is now known as Huygens principle Kepler, Johannes In addition to his work on celestial mechanics, Kepler made the first discovery of total internal reflection sometime before 1611. Maxwell, James Clerk

72. ÇÁ·¹³Ú (Augustin Jean Fresnel, 1788¡­1827) The summary for this Korean page contains characters that cannot be correctly displayed in this language/character set. http://peak.new21.org/contents/thinkquest/contents/app01/05.html

(Augustin Jean Fresnel, 1788¡­1827)

73. WWW Fi - Base De Dados De Figuras - Físicos Translate this page fresnel, augustin, Galileu Galilei, Gauss, Carl, Gibbs, Josiah. http://nautilus.fis.uc.pt/wwwfi/figuras/fisicos/fig_fisicos02.html

Rosto Figuras Base de dados de Figuras Bohr - Crookes Helmholtz - Lagrange Lambert - Volta Dirac, Paul Einstein, Albert Faraday, Michael Franklin, Benjamin Fresnel, Augustin Galileu Galilei Gauss, Carl Gibbs, Josiah

74. WWW Qui - Base De Dados De Figuras - Físicos Translate this page fresnel, augustin, Galileu Galilei, Gauss, Carl, Gibbs, Josiah. fresnel,augustin, Galileu Galilei, Gauss, Carl, Gibbs, Josiah. Topo Rosto. http://nautilus.fis.uc.pt/wwwqui/figuras/fig_fisicos02.html

Rosto Figuras Elementos Compostos Base de dados de Figuras Bohr - Crookes Helmholtz - Lagrange Lambert - Volta Dirac, Paul Einstein, Albert Faraday, Michael Franklin, Benjamin Fresnel, Augustin Galileu Galilei Gauss, Carl Gibbs, Josiah

75. WhoWhatWhen - Interactive Historical Timelines Timeline for augustin Jean fresnel (java), Search Google for augustin Jeanfresnel, augustin Jean fresnel, French physicist, 05/10/1788, 07/14/1827,39. http://www.sbrowning.com/whowhatwhen/index.php3?bydesc_x=1&desc=physicist

76. Physiker Translate this page augustin Jean fresnel (1788 - 1827). von Julia Klaudrat französischerIngenieur und Mathematiker augustin Jean fresnel wurde am 10. http://www.bhak-bludenz.ac.at/physik/geschichte/physiker/fresnel.shtml

A B C D ... Augustin Jean Fresnel wurde am 10. Mai 1788 in Broglie bei Bernay in der Normandie geboren. In seiner Freizeit befasste er sich mit Physik. Seine experimentellen und theoretischen Untersuchungen umfassten neben der Beugung die Interferenz, die Polarisation, die Doppelbrechung und die Abberation des Lichts. Interferenzversuche Zum einen der Spiegelversuch (zusammen mit Arago 1816) und zum anderen der Versuch mit dem Biprisma Fresnel erfand ein Glasprisma zur Erzeugung zirkular polarisierten Lichts, sowie die aus Glasringen aufgebauten Fresnel erkrankte 1824 an Bluthusten und verstarb am 14. July 1827 in Ville-d´Avray bei Paris. Interferenz am Doppelspiegel nach Fresnel Kurzbeschreibung: Das Experiment veranschaulicht Begriffe wie Interferenz und phasengerechtes Addieren von Amplituden. FRESNEL'SCHE ZONENPLATTEN Quellen: http://homepages.unituebingen.de/student/tilman.vogel/teil2/spaltbeugung/node4.html http://www.physik.tu-muenchen.de/~kressier/Bios/Fresnel.html geb. vor 1700

77. Www.iper1.com - Augustin Jean Fresnel Translate this page Cerca la rima. augustin Jean fresnel. augustin Jean fresnel PasquierQuesnel a b c d e f g h i j k l m n o p q r s t u v w x y z E http://www.iper1.com/rime/index.asp?cerca=Augustin Jean Fresnel

78. Ask Jeeves: Search Results For "Fresnel" Lens In 1822 a French Physicist named augustin fresnel invented a lens that wouldmake his name commonplace along the seacoasts of Europe and North America. http://webster.directhit.com/webster/search.aspx?qry=Fresnel

79. Club-Internet Encyclopédie Translate this page extrait) augustin de Canterbury (saint) augustins (couvent et musée des) augustins(ordres) Cauchy (augustin) fresnel (augustin Jean) Ambroise (saint) et http://www.club-internet.fr/cgi-bin/h?Augustin

80. Club-Internet Encyclopédie Translate this page augustin (saint) augustin de Canterbury (saint) augustins (couvent et musée des)augustins (ordres) Cauchy (augustin) fresnel (augustin Jean) Ambroise (saint http://www.club-internet.fr/cgi-bin/h?Augustins

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