Search for dissertations about: "absorption spectrometry"

Showing result 1 - 5 of 55 swedish dissertations containing the words absorption spectrometry.

  1. 1. Laser-based absorption spectrometry : development of NICE-OHMS towards ultra-sensitive trace species detection

    Author : Florian Schmidt; Ove Axner; Livio Gianfrani; Umeå universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; absorption spectrometry; trace species detection; fiber laser; modulation; cavity-enhanced spectroscopy; optical saturation; laser frequency stabilization; free-spectral-range; Physics; Fysik;

    Abstract : Laser-based absorption spectroscopy (AS) is a powerful technique for qualitative and quantitative studies of atoms and molecules. An important field of use of AS is the detection of species in trace concentrations, which has applications not only in physics and chemistry but also in biology and medicine, encompassing environmental monitoring, regulation of industrial processes and breath analysis. READ MORE

  2. 2. Development of diode laser-based absorption and dispersion spectroscopic techniques for sensitive and selective detection of gaseous species and temperature

    Author : Lemthong Lathdavong; Ove Axner; Jürgen Röpcke; Umeå universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Absorption Spectrometry AS ; Wavelengh Modulation Absorption Spectrometry WMAS ; Faraday Modulation Spectrometry FAMOS ; Tunable Diode Laser Absorption Spectrometry TDLAS ; Optics; Optik; fysik; Physics;

    Abstract : The main aim of this thesis has been to contribute to the ongoing work with development of new diode-laser-based spectroscopic techniques and metho­do­lo­gies for sensitive detection of molecules in gas phase. The techniques under scrutiny are tunable diode laser absorption spectrometry (TDLAS) and Faraday modulation spectrometry (FAMOS). READ MORE

  3. 3. The significance of calcium for the function of the pancreatic islet ß- and a2-cells : studies employing electrothermal atomic absorption spectrometry

    Author : Per-Olof Berggren; Uppsala universitet; []
    Keywords : MEDICINE; MEDICIN;

    Abstract : .... READ MORE

  4. 4. Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry

    Author : Aleksandra Foltynowicz; Ove Axner; Weidong Chen; Umeå universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; absorption spectrometry; frequency modulation; cavity enhancement; NICE-OHMS; Laser frequency stabilization; fiber laser; Fabry-Perot cavities; sub-Doppler spectroscopy; trace gas detection; Physics; Fysik; Molecular physics; Molekylfysik; fysik; Physics;

    Abstract : Noise-immune cavity-enhanced optical heterodyne molecular spectro-metry (NICE-OHMS) is one of the most sensitive laser-based absorption techniques. The high sensitivity of NICE-OHMS is obtained by a unique combination of cavity enhancement (for increased interaction length with a sample) with frequency modulation spectrometry (for reduction of noise). READ MORE

  5. 5. Optimisation of environmental gamma spectrometry using Monte Carlo methods

    Author : Francisco Javier Hernández Suárez; Peter Appleby; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Physics; Gamma spectrometry; Environmental multitracers; Monte Carlo simulations; HPGe detectors; Efficiency calibration; Self-absorption corrections.; Fysik; Physics; Fysik; Fysik; Physics;

    Abstract : Dissertation in Environmental Physics to be publicly examined in Häggsalen (Ångström Laboratory), Uppsala University, on Friday, November 8, 2002 at 10:00 am for the degree of doctor of philosophy in Physics. The examination will be conducted in English. READ MORE