Sökning: "Laser spectroscopy"

Visar resultat 21 - 25 av 325 avhandlingar innehållade orden Laser spectroscopy.

  1. 21. Sensitivity-Enhanced Raman Spectroscopy and High-Speed Fluorescence for In Situ Gas-Phase Diagnostics

    Författare :Haisol Kim; Förbränningsfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Laser; Raman Spectroscopy; Laser-Induced Fluorescence; Combustion; Pyrolysis; Gasification; Gas turbine; Fysicumarkivet A:2022:Kim;

    Sammanfattning : In this work, combustion and thermal decomposition processes were studied employing laser-based diagnostic techniques, and the techniques were improved and demonstrated to achieve enhanced detection sensitivity. Raman spectroscopy was employed to study flames under elevated and atmospheric pressures with various fuels, such as methane, hydrogen-enriched methane, DME, ethylene, and ammonia. LÄS MER

  3. 22. Laser Diagnostics in Reacting Flows

    Författare :Panagiota Stamatoglou; Förbränningsfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; planar laser-induced fluorescence PLIF ; gliding arc GA discharge; Plasma Discharges; Turbulence; Combustion Engines; Spectroscopy; high-speed camera HSC ; Burst System; OH-LIF; optical parametric oscillator OPO ; Fysicumarkivet A:2023:Stamatoglou;

    Sammanfattning : Burst-mode laser systems have widely been employed in diagnostics for both reactive and non-reactive flows. Unlike the continuous pulse lasers, burst-mode lasers generate pulses in bursts lasting up to 100 ms, capable to deliver high energies up to Joules per pulse. LÄS MER

  4. 23. Photodynamic Therapy utilizing Interstitial Light Delivery Combined with Spectroscopic Methods

    Författare :Marcelo Soto Thompson; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; onkologi; Cytologi; cancerology; oncology; Cytology; fiber optics; dosimetry; spectroscopy; tissue optics; laser-induced fluorescence; medical laser systems; Laserteknik; cancer; photodynamic therapy; interstitial; Laser technology; Fysicumarkivet A:2004:Soto Thompson;

    Sammanfattning : Since cancer continues to plague humanity there is large need for development of modalities for both diagnosis and therapy. Most of the currently available methods suffer from serious disadvantages. The treatments, e.g. LÄS MER

  5. 24. Environmental Monitoring - using diode-laser-based spectroscopic techniques

    Författare :Gabriel Somesfalean; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Diode-laser spectroscopy; frequency-modulation spectroscopy; frequency conversion; diffraction; scattering; Electromagnetism; acoustics; akustik; optik; absorption spectroscopy; Elektromagnetism; optics; Fysicumarkivet A:2004:Somesfalean;

    Sammanfattning : Monitoring of environmental gases is necessary to understand the complex processes governing global warming and the impact of pollutant emissions related to human activity. Diode-laser-based spectroscopic techniques, being robust and affordable, have a great potential to become an industrially well-established technology for environmental sensing. LÄS MER

  7. 25. Pharmaceutical and Biomedical Applications of Spectroscopy in the Photon Migration Regime

    Författare :Tomas Svensson; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Porosimetry; Biomedical optics; Pharmaceutical analysis; Monte Carlo; Scattering media; Photon migration; Laser spectroscopy; High-resolution spectroscopy; Time-resolved spectroscopy; Time-of-flight;

    Sammanfattning : The present thesis is devoted to two different matters: One part is the development of a novel optical technique for characterisation of solid pharmaceutical materials. The other part being the continued development of photon time-of-flight spectroscopy, as well as exploration of new application areas of this method. LÄS MER