Search for dissertations about: "frequency domain spectroscopy"

Showing result 1 - 5 of 29 swedish dissertations containing the words frequency domain spectroscopy.

  1. 1. Diagnosis of Moisture in Transformer Insulation - Application of frequency domain spectroscopy

    Author : Chandima Ekanayake; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; moisture content; diagnostic methods; modelling; polarisation depolarisation currents PDC ; frequency domain spectroscopy FDS ; dielectric response measurements; Oil-impregnated pressboard paper insulation; Karl Fischer titration KFT ; conductivity; ageing;

    Abstract : This thesis presents application of dielectric response measurements for identifying condition of high voltage insulation in power transformers. Results of such measurements, incorporated with different modelling techniques, allow to estimate moisture content in solid part of transformer insulation. READ MORE

  2. 2. Applications of Short Extreme Ultraviolet Pulses to the Spectroscopy of Atoms and Molecules

    University dissertation from Department of Physics, Lund University

    Author : Allan Johansson; Lunds universitet.; Lund University.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; High-order harmonics; short pulses; pulse characterisation; sidebands; lifetime measurements; time domain spectroscopy; frequency domain spectroscopy; He; N2; CO; XUV; Atomic and molecular physics; relative polarisation; Atom- och molekylärfysik; Fysicumarkivet A:2003:Johansson;

    Abstract : This thesis is devoted to the characterisation in time and frequency, and to spectroscopic application, of extreme ultraviolet (XUV) pulses. High-order harmonic generation or wave mixing processes were used to produce the pulses in the XUV spectral region. READ MORE

  3. 3. Formation and Dynamics of Molecular Excitons and their Fingerprints in Nonlinear Optical Spectroscopy

    University dissertation from Kemisk Fysik, Kemicentrum, Lunds Universitet

    Author : Pär Kjellberg; Lunds universitet.; Lund University.; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; supraledare; magnetisk resonans; spektroskopi; Physical chemistry; Fysikalisk kemi; Photochemistry; Fotokemi; Kondenserade materiens egenskaper:elektronstruktur; magnetiska och optiska ; egenskaper elektriska; supraconductors; magnetic resonance; relaxation; spectroscopy; Fysik; Chemistry; Kemi; Condensed matter:electronic structure; electrical; Physics; Redfield relaxation theory ; Inhomogeneous broadening ; Time-dependent density functional theory ; Conjugated polymers ; Three-pulse photon echo ; Molecular excitons ; magnetic and optical properties; Nonlinear spectroscopy ;

    Abstract : Popular Abstract in Swedish Många grundläggande processer i naturen involverar transport av energi från ett ställe till ett annat. Ett exempel på detta är fotosyntesen där solljus fångas upp av molekylkomplex, för att sedan transporteras till ett reaktionscenter. READ MORE

  4. 4. On the Low Frequency Noise in Ion Sensing

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Da Zhang; Uppsala universitet.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; low frequency noise; ion sensor; ISFET; electrochemical impedance spectroscopy; constant phase element; surface chemistry; CMOS technology; Engineering Science; Teknisk fysik;

    Abstract : Ion sensing represents a grand research challenge. It finds a vast variety of applications in, e.g., gas sensing for domestic gases and ion detection in electrolytes for chemical-biological-medical monitoring. READ MORE

  5. 5. Light Propagation and Gas Absorption Studies in Turbid Media Using Tunable Diode Llaser Techniques

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Liang Mei; Lunds universitet.; Lund University.; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; gas in scattering media absorption spectroscopy; tunable diode laser absorption spectroscopy; frequency modulated light scattering interferometry; light propagation; Absorption spectroscopy; turbid media; diode laser; gas monitoring; porous media; ceramics; food packaging; Fysicumarkivet A:2014:Mei;

    Abstract : Optical absorption spectroscopy is a widely used analytical tool for constituent analysis in many applications. According to the Beer-Lambert law, the transmitted light intensity through a homogeneous medium is an exponential function of the product of the concentration, the total pathlength, and the absorption cross-section of the absorbing substance. READ MORE