Ämneskategori: Övrig elektroteknik, elektronik och fotonik

Hittade 19 dokument

1. Design of a 183 GHz subharmonic mixer using membrane integrated GaAs Schottky diode technology
   Anderberg, Martin
   Examensarbete på avancerad nivå, 2018 (MSc - Wireless, Photonics and Space Engineering)
   Future ground based and space-borne meteorological instruments require sensitive heterodyne terahertz receivers in order to study precipitation and atmospheric temperature. Meteorological research is dependent on accurate water vapour measurements, typically performed with receivers at 183.3 GHz. These receivers require low noise mixers in order to meet the...
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2. Mikrovågsradiometer - en termometer för solen
   Aabel, Lise; Bergevald, Carl; Larsson, Rasmus; Marknäs, Victor; Olofsson, Frida
   Examensarbete för kandidatexamen, 2017 (Kandidatarbete)
   Radioastronomi är ett ämne som länge har intresserat forskare. Med hjälp av teleskop kan observationer av universum göras, och nya upptäckter sker hela tiden. Radioastronomi associeras dock ofta med höga kostnader och en ide om att radioastronomiska mätningar endast kan ske på observatorier. Denna rapport undersöker möjligheten att designa samt använda ett a...
3. Design, fabrication and measurements of planar Goubau lines from 0.75 THz to 1.1 THz
   Cabello Sanchez, Juan
   Examensarbete på avancerad nivå, 2017 (MSc - Wireless, Photonics and Space Engineering)
   Terahertz (THz) waves have proven to possess a unique interaction with biomolecules, and therefore it’s interesting to study its influence using biosensors. Recent advances in heterodyne technology allow measuring on-wafer scattering parameters with Vector Network Analysers (VNA) up to 1.1 THz, which could be used for THz molecular spectroscopy. Compared to...
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4. Electrical Conductivity of n-doped GaN-based Distributed Bragg Reflectors
   Hjort, Filip
   Examensarbete på avancerad nivå, 2016 (Teknisk fysik (300 hp))
   Vertical-cavity surface-emitting lasers (VCSELs) could find new applications in areas ranging from displays to bio-medicine if their wavelengths were extended into the blue spectrum. However, the realization of GaN-based VCSELs have proven to be challenging. One of the major hurdles have been to achieve epitaxially grown distributed Bragg reflectors (DBRs) w...
5. THz Imaging of Roll Compaction for Pharmaceutical Applications
   Garcia Wernersson, Joakim
   Examensarbete på avancerad nivå, 2016 (MSc - Wireless, Photonics and Space Engineering)
   In the pharmaceutical industry, dry granulation is an intermediate state in the tablet manufacturing process for orally administered products. Powder blends with poor flowing properties are compressed and milled producing a granular material with increased flow properties. A key element in the process is the density of the compressed powder since it will aff...
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6. Numerical simulation of InN based HEMTs
   VANDEMAELE, MICHIEL
   Examensarbete på avancerad nivå, 2015 (Masterarbete)
   Invented in 1980, High Electron Mobility Transistors(HEMTs) are now widely used in high-frequency electronics. They are fabricated in different material systems and a possible new material for future devices is indium nitride (InN). InN HEMTs are considered very promising because of the good electron transport properties of the material predicted by Monte Ca...
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7. Development of a low-cost laser range-finder
   Kaldén, Peter; Sternå, Erik
   Examensarbete på avancerad nivå, 2015 (MSc - Systems, Control and Mechatronics)
   This is a development report that covers the work attempting to design and construct a laserbased LIDAR. The goal of the project was to design a cheap laser rangefinder capable of performingscanning measurements. This was intended to be an open-source sensor primarily aimed at engineerslacking a cost viable sensor for positioning. The target specifications o...
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8. Fabrication of High Temperature Thermoelectric Energy Harvesters for Wireless Sensors
   Köhler, Elof
   Examensarbete på avancerad nivå, 2013 (MSc - Nanotechnology)
   Implementing energy harvesters and wireless sensors in turbofan jet engines could simplifydevelopment procedure and decrease costs. Some of the more difficult areas tomeasure with wired sensors due to cable wiring, can with wireless sensors and energyharvesters be easily accessed from the cooling channels where the temperature is between500-900C. This thesis...
9. Multi-sensor System for Non-invasive Online Liquid Analysis and Control in Bioreactors for Tissue and Organ Engineering
   Fonzo, Vito Di; Ciyako, Shwan
   Examensarbete på avancerad nivå, 2013 (MSc - Embedded Electronic System Design)
   Having a controlled environment is a necessity for growing organs and tissues. To with-hold such controlled environment, monitoring devices are used to sense the quality ofthe perfusion medium. To ensure reproducibility of the experiments, a number of pa-rameters should be monitored and recorded. In this area of medicine, the experimentalwork requires multip...
10. MEMS exural hinge and com- pliant mechanism for electromechan- ical microgrippers
    CONTI, MATTEO
    Examensarbete på avancerad nivå, 2013 (Masterarbete)
    Microrobots are used nowadays in several fields of application formany different functions. Unfortunately, their manufacture involvessome difficulties as the micrometer scale is out of reach of the traditionalmachining tools. Consequently, lithographic and etchingprocesses are adopted to achieve high aspect ratios and awless fabricationof the smallest featur...
11. Photo-structuring of Organic Layers for Flexible Electronics
    SHANMUGAM, SANTHOSH
    Examensarbete på avancerad nivå, 2013 (MSc - Nanotechnology)
    Even though inorganic Thin Film Transistors are widely used in semiconductor industries at present, organic Thin Film Transistor (OTFT) is a fast developing technology that shows flexibility in production with ultra-low cost. In recent years, wide research are made with an aim to improve the performance of OTFTs.This master thesis project was carried-out to...
12. Electromechanical actuator for car safety belt locking
    Lind, Robert; ELIASSON, NIKLAS
    Examensarbete på grundnivå, 2013 (Mekatronikingenjör (180 hp))
    The purpose was to find an electromechanical actuator that could replace today’s mechanical actuator that lock a car’s safety belt in case of an emergency.The actuator has to pass a list of requirements.Electromechanical actuators were studied and compared in order to find the best option for the assignment. Solenoids were proven to be the best option.A sole...
13. Graphene as Transparent Conductive Film for GaN-Based Vertical Cavity Surface Emitting Lasers
    Lockhart de la Rosa, César Javier
    Examensarbete på avancerad nivå, 2012 (Masterarbete)
    There is a need for lasers in the 370nm - 470nm spectrum (near ultraviolet - blue) for applications such as high storage, high resolution printers and biomedical applications. GaN-based vertical cavity surface emitting laser (VCSEL) is one interesting option due to the wide bandgap of the GaN and the 2D array capability and cost-effective production of VCSEL...
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14. Modification of nanocellulose by double-walled carbon nanotubes and graphite carbon nanopowder for sensor applications
    Toomadj, Farshad
    Examensarbete på avancerad nivå, 2011 (Masterarbete)
    Electrically conductive nanocellulose films were prepared by immersion in dispersions of double walled carbon nanotubes or graphitized nanopowder. These solutions were prepared by using the surfactant cetyltrimethylammonium bromide (CTAB) under heating and stirring which were followed by short time sonications.Electrospun cellulose and bacterial cellulose we...
15. Vertically aligned carbon nanofiber synthesis on top of TiN films for NEMS devices
    Damián, María Elena López
    Examensarbete på avancerad nivå, 2011 (Masterarbete)
    Plasma enhanced chemical vapour deposition is used for the synthesis of vertically aligned carbonnanofibers from Ni catalyst particles deposited by hole mask colloidal lithography on top of TiN.The TiN underlayer is reactively sputtered in a reliable and repeatable manner. TiN has beenselected for its CMOS compatibility and good performance as a diffusion ba...
16. Design and feasibility study of PV systems in Kenya - A case study
    Barman, Jonas
    Examensarbete på avancerad nivå, 2011 (Civilingenjör)
    Solar power has the ability to play a main role in the electrification of the developing world. Autonomous energy systems based on solar photovoltaic is, for some cases, a feasible alternative to a grid connection. Solar power can also be used as a complement to a weak grid, for facilities that requires a higher reliability of power.The main objectives of th...
17. Digital Receiver for SALSA
    Naeem, Umair; Durrani, Nabeel
    Examensarbete på avancerad nivå, 2010 (Masterarbete)
    The SALSA receiver uses a 2.3m parabolic antenna steerable in azimuth and elevation by motor driven mount. A horn with a probe integrated with a Low Noise Amplifier (LNA) is mounted in the focus of the parabola. The horn and the antenna are optimized for 1420 MHz, which is the frequency at which atomic hydrogen in the Milky Way is emitting. This Master thesi...
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18. Modelling of a Novel Micro Scaled THz Detector
    Rashid, Hawal
    Examensarbete på avancerad nivå, 2009 (Masterarbete)
    In order to extend technology into THz part of electromagnetic wave spectrum THz detectors are required. So far THz detectors have been used in astronomical observations with state of the art sensitivity requirements. To achieve the required sensitivity super conducting technology are used (temperatures below 5K). These detectors require the cryogenic tempe...
19. PLL Design at 5.8 GHz
    Banik, Biddut
    Examensarbete på avancerad nivå, 2003 (Civilingenjör)
    PLL (Phase Locked Loop) with low phase noise is a prerequisite for a communication system. Besides serving the general purposes as in cell phones, PLL is used in the ISM Bands for other special purposes incorporated with other devices. A double-PLL, generates two signals, at the ISM Band 5.8 GHz can be used for many purposes. ETC (Electronic Toll Collection)...