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

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  • Bengtsson, Magnus, et al. (författare)
  • Lidar fluorescence measurements of algal growth on electrical insulators
  • 2003
  • Ingår i: 2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666). - IEEE. - 0-7803-7734-6 ; s. 473-473
  • Konferensbidrag (refereegranskat)abstract
    • Fluorescence measurements using lidar techniques have been shown to be useful for monitoring of algal growth on e.g. historical monuments. In this experiment similar measurements were performed on electrical insulators to examine the correlation between algal growth and the quality of the insulator, a factor of importance in the high-voltage grid management
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  • Dernfalk, Andreas, 1975-, et al. (författare)
  • Laser-induced fluorescence spectroscopy for detection of biological contamination on composite insulators
  • 2003
  • Ingår i: In Proc. 13th International Symposium on High Voltage Engineering, Delft, Netherlands.
  • Konferensbidrag (refereegranskat)abstract
    • A new technique for remote detection of biological contamination on high-voltage outdoor insulators has been investigated. The technique, which is based on laser-induced fluorescence (LIF) spectroscopy, has been applied to study surfaces of real silicon rubber insulators from a distance of approximately 60 m. Measurements were performed outdoors on a number of clean, as well as, biologically contaminated insulators. Several types of biological contamination were included, as five of the studied insulators had become covered when installed in Sweden, and another three had been contaminated by fungal growth in laboratory. Fluorescence spectra obtained from the surfaces of the described insulators are presented and the applicability of the technique is discussed and compared with photographic methods.
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  • Grönlund, Rasmus, et al. (författare)
  • Fluorescence lidar multispectral imaging for diagnosis of historical monuments - Övedskloster, a Swedish case study
  • 2007
  • Ingår i: Springer Proceedings in Physics. - Springer. - 0930-8989. ; 116, s. 583-591
  • Konferensbidrag (refereegranskat)abstract
    • A fluorescence lidar measurement has been performed on the castle Övedskloster in Sweden. A mobile system from the Lund University was placed at ~40 m distance from the sandstone façade. The lidar system, which uses a frequency-tripled Nd:YAG laser with a 355-nm pulsed beam, induces fluorescence in each target point. Areas were studied by using whisk-broom scans. The possibility of detecting biodeteriogens on the surface and characterization of materials was confirmed. The method can be a tool for conservation planning and status control of the architectural heritage where fluorescence light can point out features that are not normally visible under natural illumination.
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  • Grönlund, Rasmus, et al. (författare)
  • Laser-Induced Fluorescence for Assessment of Cultural Heritage
  • 2006
  • Konferensbidrag (refereegranskat)abstract
    • Remote imaging measurements of laser-induced fluorescence have been performed, with application towards cultural heritage. Measurement campaigns have been performed at, e.g., the Coliseum in Rome. Differences in fluorescence spectra from different points were found and images corresponding to different features could be produced for thematic mapping.
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  • Grönlund, Rasmus, et al. (författare)
  • Laser-induced fluorescence imaging for studies of cultural heritage - art. no. 66180P
  • 2007
  • Ingår i: O3A: Optics for Arts, Architecture, and Archaeology. - SPIE--The International Society for Optical Engineering. - 0277-786X. - 9780819467607 ; 6618, s. P6180-P6180
  • Konferensbidrag (refereegranskat)abstract
    • Laser-induced fluorescence for remote imaging of historical monuments is an established technique, which in this work has been used in measurement campaigns at the Coliseum and the Baptistery of San Giovanni in Laterano in Rome, Italy. The results presented here are examples that show that biodeteriogens can be monitored and that. materials can be identified. Also, cleaned and soiled areas on the stone can be localized and differences between soiling can be found, which may be useful in the sustainable conservation for mapping and evaluation.
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  • 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. - IEEE Press. - 0-7803-8974-3 ; 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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