Sökning: "brytningsindex"

Visar resultat 6 - 10 av 20 uppsatser innehållade ordet brytningsindex.

  1. 6. Dual Polarized Geodesic Lens

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Freysteinn Vidar Vidarsson; [2020]
    Nyckelord :;

    Sammanfattning : Gradient-index (GRIN) lens antennas, such as the Luneburg lens, posses attractive electromagnetic properties. The smooth change in refractive index ensures no internal reflections and the focusing of the electromagnetic waves results in a directive antenna. The main challenge of the design of a GRIN lens is acquiring the required refractive index. LÄS MER

  3. 7. A Discrete Cylindrical Luneburg Lens With Liquid Layers

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Curt-Herman Normark Frisk; Erik Algarp; [2020]
    Nyckelord :Luneburg lens; 5G; high directivity; liquid lens; transparent liquids;

    Sammanfattning : In this project, a cylindrical Luneburg lens isdesigned operating at optical frequencies. A Luneburg lens isa gradient index lens that transforms a point source into aplane wave or vice versa. The lens is rotational symmetric whichallows wide-angle beam scan. In this work, the gradient indexis discretized in layers. LÄS MER

  4. 8. Simulation of Lüneburg Lens Constructed With Glide Symmetric Periodic Structures

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Joar Forsberg; Olle Blomqvist; [2020]
    Nyckelord :Metasurface; glide symmetry; lens; Lüneburglens; unit cell;

    Sammanfattning : The goal of this project was to design a lens utilisinga glide symmetric periodic structure. A Lüneburg lens forantennas with a center frequency of 8 GHz has been designed.The structure was constructed using a unit cell in the shape ofan angular Bowen knot. This unit cell was then etched on themetallic surface of a parallel plate waveguide. LÄS MER

  5. 9. Distributed Temperature Sensing Using Phase-Sensitive Optical Time Domain Reflectometry

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Simon Ek; [2020]
    Nyckelord :Applied physics; Distributed optical fiber sensing; Rayleigh scattering; OTDR; phase-OTDR; Temperature; Refractive index; Strain; Correlation; RISE; Single mode fiber; SMF; Tillämpad fysik; Distribuerad optisk fibermätning; Rayleigh-spridning; OTDR; phase-OTDR; Temperatur; Brytningsindex; Töjning; RISE; Korrelation; Singelmodfiber; SMF;

    Sammanfattning : This thesis explores and evaluates the temperature measuring capabilities of a phase-sensitive optical time-domain reflectometer (φ-OTDR), which exploits Rayleigh backscattering in normal single mode optical fibers. The device is constructed and its setup explained, and a protocol for making temperature measurements with it is developed. LÄS MER

  7. 10. Koppling av ljus in i en bandvågledare av kiselnitrat

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Erik Rydving; Ludvig Doeser; [2019]
    Nyckelord :;

    Sammanfattning : Den senaste teknologiska utvecklingen har gjort det möjligt att miniatyrisera optiska komponenter ner på ett fotoniskt integrerat kretskort. Sammankopplingen mellan olika komponenter möjliggörs av vågledare, i vilka informationsbäraren, en enskild foton, propagerar. LÄS MER