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Träfflista för sökning "WFRF:(Grönlund Rasmus) ;spr:eng;srt2:(2005)"

Sökning: WFRF:(Grönlund Rasmus) > Engelska > (2005)

  • Resultat 1-8 av 8
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2.
  • Bengtsson, Magnus, et al. (författare)
  • Fluorescence lidar imaging of fungal growth on high-voltage outdoor composite insulators
  • 2005
  • Ingår i: Optics and Lasers in Engineering. - : Elsevier BV. - 0143-8166 .- 1873-0302. ; 43:6, s. 624-632
  • Tidskriftsartikel (refereegranskat)abstract
    • Remote fluorescence imaging of fungal growth on polymeric high-voltage insulators was performed using a mobile lidar system with a laser wavelength of 355 nm. Insulator areas contaminated by fungal growth could be distinguished from clean surfaces and readily be imaged. The experiments were supported by detailed spectral studies performed in laboratory using a fibre-optic fluorosensor incorporating an optical multi-channel analyser system (OMA) and a nitrogen laser emitting radiation at 33 7 nm.
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3.
  • Bengtsson, Magnus, et al. (författare)
  • Fungus covered insulator materials studied with laser-induced fluorescence and principal component analysis
  • 2005
  • Ingår i: Applied Spectroscopy. - : SAGE Publications. - 0003-7028 .- 1943-3530. ; 59:8, s. 1037-1041
  • Tidskriftsartikel (refereegranskat)abstract
    • A method combining laser-induced fluorescence and principal component analysis to detect and discriminate between algal and fungal growth on insulator materials has been studied. Eight fungal cultures and four insulator materials have been analyzed. Multivariate classifications were utilized to characterize the insulator material, and fungal growth could readily be distinguished from a clean surface. The results of the principal component analyses make it possible to distinguish between algae infected, fungi infected, and clean silicone rubber materials. The experiments were performed in the laboratory using a fiber-optic fluorosensor that consisted of a nitrogen laser and an optical multi-channel analyzer system.
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4.
  • Grönlund, Rasmus, et al. (författare)
  • Elemental mercury emissions from chlor-alkali plants measured by lidar techniques
  • 2005
  • Ingår i: Atmospheric Environment. - : Elsevier BV. - 1352-2310. ; 39:39, s. 7474-7480
  • Tidskriftsartikel (refereegranskat)abstract
    • Differential absorption lidar (DIAL) techniques have been utilized to measure elemental gaseous mercury fluxes from mercury cell chlor-alkali (MCCA) plants as a part of the European Union funded European mercury emissions from chlor-alkali plants (EMECAP) project. Three plants have been selected as study objects and a total of six measurement campaigns have been performed, one intercalibration campaign and five flux evaluation campaigns, in both winter and summer. The measurements were carried out using the Swedish optical parametric oscillator-(OPO) based mobile lidar system developed at Lund Institute of Technology. The study shows large differences in the mercury emissions measured in winter or summer and at the different plants. The average values for the campaigns ranged from 6 g h(-1) in the winter campaign at the Swedish plant to 54 g h(-1) in the summer campaign at the Italian plant.
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5.
  • Grönlund, Rasmus, et al. (författare)
  • Mercury emissions from the Idrija mercury mine measured by differential absorption lidar techniques and a point monitoring absorption spectrometer
  • 2005
  • Ingår i: Atmospheric Environment. - : Elsevier BV. - 1352-2310. ; 39:22, s. 4067-4074
  • Tidskriftsartikel (refereegranskat)abstract
    • Mercury emission measurements from the ldrija mercury mine in Slovenia were performed during an early November 2003 campaign, where the differential lidar technique was used to map mercury concentrations and an attempt was made to quantify the total mercury flux from the most contaminated area, the abandoned cinnabar roasting oven complex. Lidar concentration data were compared with data recorded with a Zeeman modulated atomic absorption instrument, operated from a vehicle equipped with a GPS localization system. Concentrations and fluxes were comparatively low due to low temperature and rainfall. The average flux from the distillation plant was measured to approximately 2 g h(-1).
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6.
  • Grönlund, Rasmus, et al. (författare)
  • Remote imaging laser-induced breakdown spectroscopy and remote cultural heritage ablative cleaning
  • 2005
  • Ingår i: Optics Letters. - 0146-9592. ; 30:21, s. 2882-2884
  • Tidskriftsartikel (refereegranskat)abstract
    • We report, for what we believe to be the first time, on remote imaging laser-induced breakdown spectroscopy (LIBS). Measurements have been performed by using a tripled Nd:YAG laser working at 355 nm with 170 mJ pulse energy, with an expanded beam that is focused onto a target at 60 m distance. The LIBS signal is detected by using an on-axis Newtonian telescope and an optical multichannel analyzer. The imaging is performed by scanning the laser beam on the target. The same setup is also used in demonstrations of remote laser ablation for cleaning of contaminated objects with applications toward cultural heritage.
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7.
  • Grönlund, Rasmus, et al. (författare)
  • Remote laser-induced fluorescence imaging for assessment of cultural heritage
  • 2005
  • Ingår i: 2005 Conference on Lasers and Electro-Optics Europe. - 0780389743 ; , s. 685-685
  • Konferensbidrag (refereegranskat)abstract
    • In this paper, we propose to perform remote laser-induced fluorescence imaging for assessment of cultural heritage. The experiments are performed using the lidar system consist of frequency-tripled Nd:YAG laser at 355 nm with a spot size of ~4 cm diameter and the signal is collected using a coaxial 40-cm-diameter Newtonian telescope. The fluorescence light is focused into an optical fibre and guided a time-gated optical multichannel analyser system, where the fluorescence spectrum is recorded. Then the laser directed to the next point and thus a fluorescence image can be produced
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8.
  • Grönlund, Rasmus, et al. (författare)
  • Remote LIBS and Raman imaging for assessment of cultural heritage
  • 2005
  • Ingår i: 2005 Conference on Lasers and Electro-Optics Europe. - 0780389743 ; , s. 684-684
  • Konferensbidrag (refereegranskat)abstract
    • In this paper, we propose to perform remote laser-induced breakdown spectroscopy (LIBS) and Raman imaging of historical monuments to assess the state of a building. The lidar system is equipped with a Nd:YAG pumped optical parametrical oscillator (OPO) system, allowing laser radiation in the wavelength range 220 nm-4 μm. The laser radiation can be sent through a roof-top dome which can steer the radiation onto the point of interest
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  • Resultat 1-8 av 8

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