| 1. |
- Hällström, Jenny
(författare)
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Application of the Fluoresecence Lidar Techniques in the Architectural Heritage
- 2005
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)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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| 2. |
- Hällström, Jenny
(författare)
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Non-Invasive Monitoring of Architectural Heritage
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The on-site documentation and examination of architectural heritage has presented challenges for traditional analysis methods in the form of, among other things, large complex structures, sites and environmental conditions. In recent years there has been growing interest in assessing progressing deterioration processes and material analysis, with an emphasis on sustainable conservation and maintenance planning. Today, new non-invasive examination and visualisation methods are becoming increasingly important in the study of cultural heritage. Furthermore, increased awareness of complex on-site conditions and of the impact of climate on the built heritage has led to advances in monitoring and prediction technology in order to aid on-site studies, with a focus on mobile techniques. Within this context, new remote sensing techniques are also being developed, in addition to various laser-based techniques as analytical tools, such as laser-induced fluorescence. In order to address the challenge of complex analysis situations in an outdoor environment, the present research aimed to investigate the potential of a remote sensing method involving the use of two mobile systems. The study focused on the architectural surface of historical monuments, mainly on stone and brick materials, using a laser-induced fluorescence technique to monitor a building from a remote location. The study is in the form of a multiple case study research project using a mixed methodology strategy to provide context and sufficient data for the analysis of building status and aspects of deterioration, both for traditional building documentation and the fluorescence analysis. There were cases studies: Övedskloster in Sweden, the Coliseum Amphitheatre and the Lateran Baptistery in Rome. These produced information on conducting remote investigation on site and the possibility of conducting interdisciplinary studies as well as providing support for supplementary laboratory studies. The use of a non-invasive technique indicated a potential for remote analysis, with the ability to scan the façade from up to 65 metres, and early detection of non-visual phenomena by means of fluorescence. In addition, it was possible to visualise monitoring phenomena on historic façades by means of thematic mapping and, where hyperspectral imaging could suffice, visualisation of analysis. The research demonstrated the early detection of biodeteriogens in fluorescence on areas that were difficult to assess from ground level, for identification as well as for an initial assessment of the chlorophyll content, which could indicate a need for further monitoring as well as pointing out areas requiring further analysis of species categories and potential spread. The initial characterisation of surface material, both previously known and non-visual, was also investigated. This could prove useful when planning conservation decisions and sustainable maintenance. The technique could also serve as a basis for the identification and initial assessment of the contribution of chemical treatments, soiling and biodeteriogens, where monitoring of large architectural structures is required. Finally, the technique may be particularly suitable for providing an initial indication for planning maintenance and/or for the future minimum conservation of large-scale objects, especially in the outdoor environment where uncontrolled external conditions are inevitable. This could also help with suitable documentation over time by monitoring changes and the speed of the deterioration processes by means of repeated whisk-broom scanning at regular intervals over time. It could also be used as a tool in conservation maintenance planning.
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| 3. |
- Wahlöö, Anna, et al.
(författare)
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Kyrkorum efter branden: Var god sitt – i stol eller bänk
- 2023
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Ingår i: Bebyggelsehistorisk tidskrift. - Uppsala : Föreningen Bebyggelsehistorisk tidskrift. - 0349-2834 .- 2002-3812. ; 85, s. 68-88
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Wahlöö, Anna, et al.
(författare)
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Kyrkorum efter branden : Var god sitt - i stol eller bänk: samtida sittmöbelförändringar i svenska kyrkor
- 2023
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Ingår i: Bebyggelsehistorisk tidskrift. - 0349-2834. ; 2023:85, s. 68-84
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- I våra kyrkor återfinns många av Sveriges mest intressanta kulturhistoriska interiörer som kan följas hundratals år bakåt i tiden. Nya idéer och former för rummets möblering och sittmöbler sker i takt med samhällets utveckling och blir nya fysiska tidslager i kyrkans narrativ. Några av vår tids stora frågeställningar har utgångspunkt i miljö, demokrati, ekonomi och hållbarhet men även arbetsmiljö, tillgänglighet och inkludering. De om- och nygestaltningar av sittmöbler som vi har studerat i kyrkor som drabbats av brand och återuppförts efter plötslig förstörelse kan ses som uttryck för detta. Ett flexibelt och mångfunktionellt kyrkorum som kan anpassas och ändras efter verksamhet har för många församlingar blivit ledord efter branden. För att nå dit har ibland antalet bänkar reducerats i delar av kyrkorummet för att frigöra golvyta för olika aktiviteter som fika, samkväm, sång och musicerande som i rummet blir tydliga fysiska zoner med särskilt anpassade sittmöbler för olika användargrupper och professioner. Bänkarna kompletteras ofta med lösa stolar som kan flyttas och användas efter behov men också och bäras undan och förvaras i förråd eller andra utrymmen när de inte är i bruk.
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| 5. |
- Wahlöö, Anna, et al.
(författare)
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Stolar och bänkar : En sittmöbelstudie i Lunds stifts gudstjänstrum
- 2021
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Det pågår förändringar i våra kyrkor. Krav och behov på användande av gudstjänstrum leder till ändringar och ibland omfattande omgestaltningar. Föreliggande rapport är ett resultat av en studie som fokuserar påförändringsprocesser kopplade till sittmöbler i Svenska kyrkan, närmare bestämt bänkar och stolar avsedda för församlingen. Våra exempel är hämtade från nyligen genomförda eller pågående sittmöbelförändringar i Lunds stift. Församlingens sittmöbel är uttryck för praktiska krav och behov som kan kopplas samman med samhällsutvecklingen, förhållningssätt och demokratiskaaspekter genom frångången av formalitet, hierarkier och auktoriteter. Stolen kan ses som en exponent och ett uttryck för detta. Och för individen. Förändringarnaav sittmöblerna blir del av kyrkans berättelse och historiska lager. Studien blir därför också ett bidrag till den svenska kyrkans utveckling och historia. Studien berättar vår samtids gestaltande av offentliga rum, Svenska kyrkans gudstjänstrum, beträffande sittplatser. Den utveckling vi ser i svenska gudstjänstrum förekommer även inom andra områden i samhället, exempelvis inom kultur-och idrottssektorn, i stadens parker och på torg.
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