Essays about: "Frequency conversion"

Showing result 1 - 5 of 81 essays containing the words Frequency conversion.

  1. 1. Towards a setup for narrowband terahertz generation through difference-frequency mixing of chirped ultrashort pulses

    University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Author : Isa Clementsson; [2023]
    Keywords : Physics and Astronomy;

    Abstract : Terahertz radiation is a useful tool for inducing lower-energy excitations in matter, where it can be used to cause structural changes through direct interaction with the crystal lattice. Sub-picosecond optical pulses can be used to generate intense broadband terahertz pulses through optical rectification in nonlinear crystals, reaching peak electric fields of several MV/m and conversion efficiencies as high as a few percent. READ MORE

  3. 2. Real Time Navigation Algorithms for LEO Small Satellites using COTS GNSS

    University essay from KTH/Lantmäteri – fastighetsvetenskap och geodesi

    Author : Nathan Groisne; [2023]
    Keywords : PNT; Small Satellite; COTS; GNSS; Navigation; ACS; PNT; små satelliter; COTS; GNSS; navigering; ACS;

    Abstract : Many satellites in LEO use a GNSS-based navigation system, taking advantage of the GNSS constellations in MEO to enhance navigation capabilities. The thesis work focused on developing the software enabling GNSS-based navigation for Hemeria's future small satellites operating in LEO. READ MORE

  4. 3. A Novel Two-Level Inverter Design for Efficient Energy Conversion in a Maglev Train Rail

    University essay from Högskolan i Halmstad/Akademin för informationsteknologi

    Author : Oskar Zetterström; Stefan West Westholm; [2023]
    Keywords : IGBT; Inverter; Gate-driver; Prototype; Pulse width modulation; Sine wave; Maglev train; IGBT; Växelriktare; Grinddrivenhet; Prototyp; Pulsbreddsmodulering; Sinusvåg; Maglevtåg;

    Abstract : This report covers the construction of a prototype inverter system designed to power the rail of a maglev train, from component selection through simulations and power demands to mounting and wiring the components into a cabinet. The inverter is made with insulated gate bipolar transistors controlled with pulse-width modulated signals provided by a custom microcontroller. READ MORE

  5. 4. Investigation of switching power losses of SiC MOSFET : used in a DC/DC Buck converter

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : André Xavier Svensson; [2022]
    Keywords : Switching power losses; Metal Oxide Semiconductor Field Effect Transistor; Silicon carbide; Synchronous Buck converter; Wide Band Gap; Double Pulse Test; Efficiency; Temperature; Växlande effektförluster; Fälteffekttransistor; Kiselkarbid; Synchronous Buck omvandlare; Wide Band Gap; Double Pulse Test; Verkningsgrad; Temperatur;

    Abstract : All DC/DC converter products include power electronic circuits for power conversion.It is important to find an efficient way for power conversion to reduce power losses and reduce the need for cooling and achieve environmentally friendly solutions.The use of semiconductor switches of wide band gap type is a solution to the problem. READ MORE

  6. 5. Design of radio frequency energy harvesting system : for use in implantable sensors

    University essay from Linköpings universitet/Elektroniska Kretsar och System; Linköpings universitet/Tekniska fakulteten

    Author : Amir Ebrahimi; David Kihlberg; [2022]
    Keywords : RF energy harvesting; RF rectifier; efficiency; voltage sensor; voltage doubler;

    Abstract : Implantable biomedical wireless sensors provide monitoring of vital health signs such as oxygen, temperature and intraocular pressure and may help to analyse and detect diseases in humans and animals. However, one of the design challenges of implantable devices is providing a safe and reliable energy source. READ MORE