Dissertations / Theses on the topic 'Refraction'
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Li, Tsan Hang. "Theoretical study of negative refractive electromagnetic and acoustic media /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20LIT.
Full textIncludes bibliographical references (leaves 124-126). Also available in electronic version. Access restricted to campus users.
Lehman, Joseph Christian. "Sphero-cylindrical Refraction with Spherical Lenses." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587510615809807.
Full textBeaman, Heather. "Reflection-Refraction." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1888.
Full textHartwig, Andreas. "The influence of optics, peripheral refraction and posture on refractive error development." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-optics-peripheral-refraction-and-posture-on-refractive-error-development(f0382767-3194-4631-8cab-d473d64900bd).html.
Full textRodgman, D. N. "Refraction in volume graphics." Thesis, Swansea University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638701.
Full textTurpin, Avilés Alejandro. "Conical refraction: fundamentals and applications." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/322801.
Full textThe conical refraction phenomenon in biaxial crystals is known since 1832 when William Hamilton predicted mathematically that and ideally collimated light beam passing through a biaxial crystal parallel to one of the crystal optic axes would refract as an slanted cone within the crystal and emerge as a hollow light cylinder, whose transverse profiles forms a light ring. The afterwards observation of the phenomenon by Humphrey Lloyd made the conical refraction phenomenon to become one of the first phenomenon that were observed after their prediction, as well as the one who tip the scales towards the wave theory of light against the corpuscular theory. In the late 70s, Belsky and Khapalyuk presented the diffractive formulation of the phenomenon for cylindrically symmetric beams, this formalism being reformulated by Berry during the last decade. In this thesis, we explore conical refraction in deep and present some applications of this phenomenon. Firstly, we show that, after some theoretical development, Berry’s formalism can be used to predict the transformation of beams along any propagation direction, no matter the state of polarization or transverse profile they posses and the number of crystals in cascade used. The diffractive theory is also used to demonstrate that, by simply tuning the ratio between the conical refraction ring radius and the waist radius of the input beam, a rich variety of light beams and optical singularities can be generated. Then, we show that conical refraction can be understood as the transformation of the input plane waves into a pair of conical waves whose interference leads to the characteristic concentric bright rings at the focal plane. Additionally, we propose an alternative theory that allows calculating the resulting pattern beyond the biaxial crystal for any input light beam by considering splitting of input wave-vectors and we apply this simple formalism to predict the resulting pattern for a cascade of crystals. In particular, we demonstrate a multiplexing and de-multiplexing system for monochromatic signals for free space optical communications applications based on three biaxial crystals in cascade. The latter results are used to propose and realize different optical architectures for optical trapping of both ultra-cold atoms and absorbing particles. In this sense, show both theoretically and experimentally that dark optical geometries generated with conical refraction are of complete usefulness to trap Bose–Einstein condensates, in collaboration with the group of Prof. Gerhard Birkl at the Technische Universität Darmstadt. Additionally, we use the particular polarization distribution along the conical refraction rings to build a reconfigurable optical bottle capable to load and unload macroscopic absorbing particles at wish, in collaboration with the group of Prof. Wieslaw Krolikowski at the Australian National University. We also explore the world of quantum optics throughout the analysis of both type I and type II second harmonic generation of a conically refracted beam and we demonstrate that the second harmonic beam keeps most of the properties of the fundamental harmonic beam. Finally, we present a theoretical proposal to design an optical device able to detect linear momentum entanglement between twin photons, a biaxial crystal being the key element of the device.
Trendall, Chris. "Ray tracing refraction in hardware." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ49742.pdf.
Full textValle, G. Raul del. "Model parameterization in refraction seismology." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66057.
Full textWu, Qi. "Negative refraction by photonic nanostructures." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337163.
Full textMartos, Justin Riley. "Fault Mapping with the Refraction Microtremor and Seismic Refraction Methods along the Los Osos Fault Zone." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/873.
Full textOxburgh, Stephen B. "Transforming transformation optics via generalised refraction." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7539/.
Full textDirdal, Christopher Andrew. "Negative Refraction in Non-Magnetic Metamaterials." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19337.
Full textCary, Peter William. "Waveform inversion of marine refraction data." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330175.
Full textDavison, M. "Refraction effects in precise surveying measurements." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378767.
Full textSozou, Peter Demetris. "Studies in optical flow and refraction." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320423.
Full textZhang, Jie. "Nonlinear refraction and reflection traveltime tomography." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10717.
Full textBuriak, I. A. "Microware applications of negative-refraction metamaterials." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46869.
Full textSalomon, Felix. "Refraction index modification by synchrotron radiation." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-44255.
Full textPeak, Scott Douglas. "Wave refraction over complex nearshore bathymetry." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FPeak.pdf.
Full textRay, Timothy Allen. "Wave propagation over complex bathymetry." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FRay.pdf.
Full textThesis advisor(s): Thomas H.C. Herbers, Edward B. Thornton. Includes bibliographical references (p. 37). Also available online.
Dube, Zack. "Computational Reconstruction of the Physical Eye Using a New Gradient Index of Refraction Model." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34791.
Full textCarrie, A. L. S. "Wave refraction modelling and longshore sediment transport." Thesis, University of East Anglia, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372553.
Full textWang, Qiang. "Atmospheric refraction and propagation over curved surfaces." Thesis, Open University, 1998. http://oro.open.ac.uk/44453/.
Full textEtminan, Arvin. "Index of Refraction : Transparent Medium in 3D." Thesis, Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79111.
Full textThis essay describes the development of this project, where the focus is on theories and facts about light and transparent mediums. The aim of the project was to test and experiment the mentioned area in 3D graphics, where the results are single rendered images with analysis, discussions and conclusions.
Wang, Qiang. "Atmospheric refraction and propagation over curved surfaces." n.p, 1997. http://ethos.bl.uk/.
Full textOtero, Molins Carles. "Lens-based technologies to study accommodation and refraction." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/461452.
Full textUn estímul visual es pot presentar a l'espai lliure o a través de sistemes basats en lents. Curiosament, en el passat s'ha reportat moltes vegades que alguns subjectes acomoden de forma més pobre quan aquesta és estimulada per mitjans òptics. Tanmateix, aquesta limitació no ha impedit l'ús de sistemes basats en lents en dispositius oftàlmics, sistemes de realitat virtual o muntatges òptics de recerca, probablement perquè es compensen les limitacions amb alguns avantatges com el control per ordinador del pla focal del estímul. En aquest context general, l'objectiu d'aquesta tesi és aplicar tecnologies basades en lents (des de lents electró-òptiques controlades per ordinador fins a sistemes Badal) per estudiar l'acomodació i refracció. La metodologia d'aquesta tesi està estructurada en 6 estudis. Els primers tres estudis investiguen la resposta del sistema acomodatiu quan està estimulat òpticament amb un optòmetre Badal. Els 3 estudis restants aprofiten els sistemes varifocals electró-òptics per investigar noves metodologies relacionades amb la refracció subjectiva automàtica i la prova de flexibilitat acomodativa. Concretament, el quart estudi és una validació clínica d'un nou algorisme de refracció automatitzat i és l'únic estudi que treballa específicament en la refracció ocular. Els estudis cinquè i sisè utilitzen una lent òptica electró-òptica per presentar un estímul repetit a diferents distàncies acomodatives. El cinquè estudi valida una nova prova híbrida acomodativa que integra la prova de flexibilitat acomodativa llunyana i propera amb canvis aleatoris d'estímul acomodatiu i, el sisè estudi explora com la predictibilitat d'un estímul afecta la dinàmica acomodativa. Els resultats dels tres primers estudis mostren que les diferències reportades anteriorment en la resposta acomodativa quan s'utilitzen mètodes basats en lents en comparació amb la visualització d'estímuls en l'espai lliure es pot explicar per l'efecte de factors com l'error refractiu o el camp de visió més que en el mètode d'estimulació d'acomodació. També es demostra que l'acomodació és més precisa per a camps visuals entre 8 i 10º, el que suggereix que hi pot haver una mida d'imatge retiniana òptima per a l'estimulació de l'acomodació. A més, es demostra que l'únic factor que afecta aïlladament l'exactitud de la resposta acomodativa és el tipus d'error refractiu. També, es demostra que la precisió de la resposta acomodativa generalment millora amb un estímul bidimensional amb pistes de profunditat perifèriques i desenfoc simulat per a un camp de visió relativament gran. Aquestes condicions es poden utilitzar per millorar el confort visual en aquells sistemes de realitat virtual o simuladors visuals que utilitzen un sistema òptic varifocal per canviar el pla focal d'una superfície bidimensional. Els resultats de l'estudi 4 mostren la primera implementació d'un nou mètode potencial per a la realització de refracció subjectiva no cicloplègica en adults sense suport clínic. Encara que aquest mètode requereix encara una investigació addicional en una població més àmplia en termes d'edat, refracció i condicions oculars diferents, és més precís que els mètodes de refracció objectius i té el potencial d'incorporar-se a noves tecnologies basades en lents per millorar els serveis d'atenció primària en països en vies de desenvolupament. Finalment, els dos últims estudis mostren la primera implementació d'una nova prova de flexibilitat acomodativa que integra tant la prova llunyana i propera, amb canvis aleatoris d'estímul acomodatiu. Aquesta nova metodologia és una prova més ràpida que l'execució de les proves d'acomodació pròxima i llunyana i proporciona més informació que les proves de flexibilitat acomodativa per separat. Addicionalment, aquests dos estudis mostren que la capacitat predictiva en l'acomodació es insignificant i que la imprevisibilitat de l'estímul no afecta la dinàmica acomodativa
Mansfeld, Sebastian [Verfasser]. "Spin-Wave Optics: Refraction and Imaging / Sebastian Mansfeld." München : Verlag Dr. Hut, 2012. http://d-nb.info/1028785607/34.
Full textAzzeer, A. M. A. "Some nonlinear laser induced reflection and refraction phenomena." Thesis, Swansea University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635819.
Full textDodd, N. "Parabolic approximations in water wave refraction and diffraction." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384404.
Full textBlanchette, Damon Arthur. "Adaptive Spectral Mapping for Real-Time Dispersive Refraction." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/110.
Full textChristiaans, Johan. "Investigation of refraction effects for small GPS networks." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/18308.
Full textDERROUGH, SAMIR. "Reseaux polymeres interpenetres a gradient d'indice de refraction." Université Louis Pasteur (Strasbourg) (1971-2008), 1993. http://www.theses.fr/1993STR13028.
Full textWee, Wei Hsiung. "The physics of negative refraction and transformation optics." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/8996.
Full textLee, Jong-Ha. "Study on shallow subsurface imaging using refraction waves." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145349.
Full textGoodwin, Eric Peter. "Dual Interferometer System for Measuring Index of Refraction." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195904.
Full textWard, Dale Michael 1963. "Atmospheric sounding from satellite solar occultation refraction measurements." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282495.
Full textConstantinides, Antonios. "Refraction interference elimination employing smart arrays at VHF." Thesis, Middlesex University, 2017. http://eprints.mdx.ac.uk/22243/.
Full textAzadeh, Mohammad. "Reflection and Refraction of Light from Nonlinear Boundaries." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4715.
Full textSchmutz, Myriam. "Apport des methodes geophysiques a la connaissance des glissements-coulees developpes dans les marnes noires. Application a super sauze (alpes de haute provence, france)." Université Louis Pasteur (Strasbourg) (1971-2008), 2000. http://www.theses.fr/2000STR1GE07.
Full textWei, Tai-Huei. "Nonlinear Optical Absorption and Refraction Study of Metallophthalocyanine Dyes." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc278287/.
Full textByers, David John. "Synoptic and mesoscale influences on refraction during SHAREM 110." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA303233.
Full text"December 1995." Thesis advisor(s): Kenneth L. Davidson, Carlyle H. Wash. Bibliography: p. 123. Also available online.
Erck, Eric Stephenson. "Subsurface conductive isolation of refraction correlative magnetic signals (SCIRCMS)." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1072.
Full textRobinson, Tyler D., Jonathan J. Fortney, and William B. Hubbard. "Analytic Scattering and Refraction Models for Exoplanet Transit Spectra." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/627105.
Full textSchonbrun, Ethan. "Negative refraction and anomalous propagation in silicon photonic crystals." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3256376.
Full textSudhakaran, Sunil. "Negative refraction from electromagnetic periodic structures and its applications." Thesis, Queen Mary, University of London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430074.
Full textXia, Wenjun. "Refraction of nonlinear light beams in nematic liquid crystals." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7726.
Full textEl-Aassar, Ahmed. "MODELING OF ATMOSPHERIC REFRACTION EFFECTS ON TRAFFIC NOISE PROPAGATION." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3804.
Full textPh.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering
Hutchings, David Crichton. "Theory of nonlinear refraction and optical bistability in semiconductors." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/1008.
Full textChen, Meng-Yi. "Nonlinear diffraction and refraction of regular and random waves." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34378.
Full textIncludes bibliographical references (p. 302-306).
The mild-slope equation is an effective approximation for treating the combined effects of refraction and diffraction of infinitesimal water waves, for it reduces the spatial dimension of the linear boundary value problem from three to two. We extend this approximation to nonlinear waves up to the second order in wave steepness, in order to simplify the inherently three-dimensional task. Assuming that the geometrical complexity is restricted to a finite, though large, horizontal domain, the hybrid-element method designed earlier for linearized problems is modified for the two-dimensional elliptic boundary-value problems at the second order. This thesis consists of two parts. In Part I, the incident waves are monochromatic. Application is first made to the special case of a a semi-circular peninsula (or a vertical cylinder on a cliff). Effects of the angle of incidence are examined for the free surface height along the cylinder. Numerical results for three examples involving radially varying depth are discussed. In Part II the second-order mild-slope approximation will be further extended for random waves with a broad frequency spectrum. A stochastic approach of Sclavounos is generalized for the prediction of spectral response in harbors. Focuss is on the low-frequency harbor resonance, so the third-order solution is unnecessary. Numerical examples are given for a simple square harbor of constant depth. Effects of harbor entrance are examined. Possible extensions and other applications are discussed.
by Meng-Yi Chen.
Ph.D.
Andriatsitohaina, Johnny Eric Fernand Rastefano. "Accurate refraction modelling in 3-D complex isotropic media." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614796.
Full text