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Sökning: WFRF:(Grönlund Rasmus) > Engelska > Fritt online

  • Resultat 1-4 av 4
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  • Bengtsson, Magnus, et al. (författare)
  • Fungus covered insulator materials studied with laser-induced fluorescence and principal component analysis
  • 2005
  • Ingår i: Applied Spectroscopy. - Society of Applied Spectroscopy. - 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.
  • Grönlund, Rasmus, et al. (författare)
  • Remote imaging laser-induced breakdown spectroscopy and remote cultural heritage ablative cleaning
  • 2005
  • Ingår i: Optics Letters. - Optical Society of America. - 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.
  • Grönlund, Rasmus, et al. (författare)
  • Remote Multicolor Excitation Laser-Induced Fluorescence Imaging
  • 2006
  • Ingår i: Laser Chemistry. - Hindawi Publishing Corporation. - 0278-6273. ; 2006, s. 57934
  • Tidskriftsartikel (refereegranskat)abstract
    • Remote laser-induced fluorescence of stone materials was performed with application towards cultural heritage. Fluorescence was induced in targets ∼60 m from a mobile lidar laboratory by ultraviolet laser light, either from a frequency-tripled Nd:YAG laser or from an optical parametric oscillator system. Analysis was performed on combined spectra from the different excitation wavelengths and it was noted that important additional information can be gained when using several excitation wavelengths.
  • Palombi, Lorenzo, et al. (författare)
  • Hyperspectral fluorescence lidar imaging at the Colosseum, Rome
  • 2008
  • Ingår i: Optics Express. - Optical Society of America. - 1094-4087. ; 16:10, s. 6794-6808
  • Tidskriftsartikel (refereegranskat)abstract
    • Fluorescence lidar techniques offer considerable potential for remote, non-invasive diagnostics of stone cultural heritage in the outdoor environment. Here we present the results of a joint Italian-Swedish experiment, deploying two hyperspectral fluorescence lidar imaging systems, for the documentation of past conservation interventions on the Colosseum, Rome. Several portions of the monument were scanned and we show that it was possible to discriminate among masonry materials, reinforcement structures and protective coatings inserted during past conservation interventions, on the basis of their fluorescence signatures, providing useful information for a first quick, large-scale in situ screening of the monument.
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