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Sökning: WFRF:(Hällström Jenny)

  • Resultat 1-10 av 17
  • [1]2Nästa
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1.
  • Ahlgren, Karin, et al. (författare)
  • De stora restaureringarna Från Uppsala domkyrka till Skokloster
  • 2004
  • Rapport (populärvet., debatt m.m.)abstract
    • <p>De stora restaureringarna har varit årets tema. Genom att dokumentera och analysera teori och praktik i några av 1800- och 1900-talets största restaureringar - från genomgripande stilrestaureringar till ett mer återhållsamt och tekniskt skon­samt synsätt. Därmed får vi också ett bättre underlag även för dagens ställningsta­gande.Föremål för våra studier är Uppsala domkyrka, Gripsholms slott, Vreta kloster­kyrka, Gustav 11I:s paviljong i Haga, Kungapalatset i Vadstena och Skoklosters slott. Vi hoppas att denna utställning skall bidra till en kritisk hållning och en ökad kunskap om restaureringskonsten, som kvalificerad yrkesuppgift, tidsspegel för historiesyn och som gestaltningsideal.</p>
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2.
  • Ellfolk, Jan-Erik, et al. (författare)
  • Folkungapalatset i Vadstena
  • 2005
  • Ingår i: Kulturvärden. - Statens Fastighetsverk. - 1104-845X. ; :2, s. 25-28
  • Tidskriftsartikel (populärvet., debatt m.m.)
3.
  • Grönlund, Rasmus, et al. (författare)
  • Fluorescence lidar multispectral imaging for diagnosis of historical monuments - Övedskloster, a Swedish case study
  • 2007
  • Ingår i: 6th International Conference on Lasers in the Conservation of Artworks (LACONA VI),Vienna, Austria,2005-09-21 - 2005-09-25. - Springer.
  • 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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4.
  • Grönlund, Rasmus, et al. (författare)
  • Laser-Induced Fluorescence for Assessment of Cultural Heritage
  • 2006
  • Ingår i: 23rd International Laser Radar Conference,Nara, Japan,2006-07-24 - 2006-07-28.
  • 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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5.
  • 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 Conference,Munich, Germany,2007-06-20 - 2007-06-22. - SPIE.
  • 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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6.
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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,Munich, Germany,2005-06-12 - 2005-06-17. - IEEE - Institute of Electrical and Electronics Engineers Inc..
  • 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 Multicolor Excitation Laser-Induced Fluorescence Imaging
  • 2006
  • Ingår i: Laser Chemistry. - Hindawi Publishing Corporation. - 0278-6273. ; 2006, s. 57934-57934
  • 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.
9.
  • Hällström, Jenny (författare)
  • Application of the Fluoresecence Lidar Techniques in the Architectural Heritage
  • 2005
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • The primary aim of the research project is to analyse the potential for the application of lidar and fluorescence techniques in building investigation, and also to establish a scientific remote-sensing method for surveying and analysing the historical facade that is non-destructive and can be used in-situ. The fluorescence lidar method uses point-monitoring and scanning of areas that can provide multispectral images in order to identify materials, biodeteriogens and other substances not visible to the human eye. A specific aim of the project is to develop the method to improve the understanding of our building heritage, conservation and its effects, and to provide a basis for new interventions and maintenance. The main focus of this study has been the built environment with an emphasis on masonry with stone and bricks. Fluorescence techniques are known to be capable of revealing aspects that are not evident to the naked eye or to photography. The lidar technique makes it possible to extend the application of fluorescence spectroscopy to the outdoor environment, remote sensing, with sometimes large distances and uncontrollable background light. This project is an international cooperation involving researchers from different disciplines in Sweden and Italy. Six different case studies are central for this analysis of the application of the technique. The work described in the thesis involves both historical-archival studies and in-situ investigations in Sweden and Italy, as well as laboratory studies on stone material. The fluorescence lidar measurements were made both in-situ on the facades of Övedskloster castle in Sweden, on the amphitheatre Coliseum and on the Lateran Baptistery in Rome, Italy and in laboratory studies on stone and brick samples. The six case studies have been diverse not only in their context and historical background but also with regard to the aims and methods of investigation, measurement and analysis. This has given a differentiated material to work with, although the evaluation of the potential of fluorescence´ lidar has been the main objective. In this first phase, the main work has been to collect and organize data. The data has been obtained through historical and archival studies that have provided a basis and background material for ocular investigations on site, laboratory experiments and the fluorescence lidar measurements. The condition of the stone material in the case studies has varied depending on its history, environment and conservation, but it all showed signs of weathering, exfoliation, chromatic alteration, biodeteriogens etc as well as different restoration and conservation histories. The preliminary analysis from measurement data have used to try to identify phenomena which are not visible to the human eye but which may have an impact in the future, e.g. biodeteriogens on the surface, as well as phenomena that can indicate and support the identification of materials and how to distinguish between them. The ultimate purpose is to evaluate the material from the case studies in order to develop the method as a useful tool for the ongoing maintenance, safeguarding and future conservation of our architectural heritage.
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10.
  • Hällström, Jenny, et al. (författare)
  • Documentation of soiled and biodeteriorated facades: a case study on the Coliseum, Rome, using hyperspectral imaging fluorescence lidars
  • 2009
  • Ingår i: Journal of Cultural Heritage. - Elsevier. - 1778-3674. ; 10:1, s. 106-115
  • Tidskriftsartikel (refereegranskat)abstract
    • Non-invasive documentation of historic façades with fluorescence lidar techniques can provide helpful information for the cultural heritage sector, especially when large areas outdoors are to be examined. This paper presents a case study on the Coliseum, Rome, where both cleaned and heavily soiled areas of the monument were scanned and analysed with two fluorescence lidar systems. Biodeterioration processes have also been addressed during the experiment with the aim of assessing the colonisation extent on selected areas of the monument. Results show the usefulness of a mobile fluorescence lidar system for documentation and survey of large surfaces with complex conditions without limiting the public access to the monument.
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  • Resultat 1-10 av 17
  • [1]2Nästa
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