Sökning: "chirp"

Visar resultat 1 - 5 av 20 avhandlingar innehållade ordet chirp.

  1. 1. Fibre Bragg Grating Components for Filtering, Switching and Lasing

    Detta är en avhandling från Stockholm : KTH

    Författare :Zhangwei Yu; KTH.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibre Bragg grating; photosensitivity; apodization; chirp; phase-shift; microwave optical filtering; TECHNOLOGY Electrical engineering; electronics and photonics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik;

    Sammanfattning : Fibre Bragg gratings (FBGs) are key components for a vast number of applications in optical communication systems, microwave photonics systems, and optical sensors, etc. The main topic of this thesis is fibre Bragg grating fabrication and applications in direct microwave optical filtering, high speed switching and switchable dual-wavelength fibre lasers. LÄS MER

  2. 2. Linear chirp signal parameter estimation

    Detta är en avhandling från Stockholm : Signaler, sensorer och system

    Författare :Björn Völcker; KTH.; [1999]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 3. Holocene and Latest Glacial Paleoceanography in the North-Eastern Skagerrak

    Detta är en avhandling från Stockholm : Institutionen för geologi och geokemi

    Författare :Richard Gyllencreutz; Stockholms universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Skagerrak; Holocene; sediment; chirp sonar; grain size; mineral magnetic properties; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap;

    Sammanfattning : Detailed information on past oceanographic and climatic changes is crucial for our understanding of natural climate variability and for the assessment of future climate variations. Sediments strongly influenced by the North Atlantic Current accumulate at high rates in the northeastern Skagerrak, forming a potential highresolution archive for information on past climatic and oceanographic processes and events. LÄS MER

  4. 4. Characterisation and Applications of Ultrashort Extreme Ultraviolet Pulses

    Detta är en avhandling från Atomic Physics, Department of Physics, Lund University

    Författare :Johan Norin; Lunds universitet.; Lund University.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ultrashort pulses; pulse characterisation; sidebands; interferometry; Atom- och molekylärfysik; acetylene; Atomic and molecular physics; High-order harmonics; XUV; Fysicumarkivet A:2002:Norin;

    Sammanfattning : When a strong laser field interacts with free atoms, harmonics up to very high orders are created. This extreme ultraviolet (XUV) radiation has interesting properties, such as spatial and temporal coherence, short pulse duration and high brightness. This thesis concentrates on the temporal aspects of this radiation. LÄS MER

  5. 5. Modelling and Inference using Locally Stationary Processes : Biomedical applications

    Detta är en avhandling från Lund University, Faculty of Science, Centre for Mathematical Sciences, Mathematical Statistics

    Författare :Rachele Anderson; Lunds universitet.; Lund University.; Lund University.; [2017-11]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Modelling of Time-Varying Signals; Locally Stationary Processes; Statistical Inference; Time-frequency Estimation; Regression; EEG Signals; HRV Signals;

    Sammanfattning : This thesis considers statistical methods for non-stationary signals, specifically stochastic modelling, inference on the model parameters and optimal spectral estimation. The models are based on Silverman’s definition of Locally Stationary Processes (LSPs). LÄS MER