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Papers by Farideh Fekrsanati
Optics and Lasers in Biomedicine and Culture, 2000
... Lasers in Historical Glass Cleaning Klaus Dickmann1, Jens Hildenhagen1, Farideh Fekrsanati1,H... more ... Lasers in Historical Glass Cleaning Klaus Dickmann1, Jens Hildenhagen1, Farideh Fekrsanati1,Hannelore Romich2, Carola ... Fundamental studies were carried out on laser removal of variousde-posits from ... of laser fluence H (x) into the material is given by Beer's fluenceTT' Fig ...
Journal of the Institute of Conservation, 2010
... his collection, a description of the technical solutions we arrived at and an analysis of the... more ... his collection, a description of the technical solutions we arrived at and an analysis of the ... picture glass was therefore chosen, meaning that there would be a greater risk of breakage ... This package was fitted into the frame as normal, using a hardboard backing sheet and spring ...
Journal of Cultural Heritage, 2000
The ablation of biofilms by excimer laser radiation was systematically examined in a series of mo... more The ablation of biofilms by excimer laser radiation was systematically examined in a series of model studies during which the biofilms originating from different historical panels were simulated on model glasses. The composition of these model glasses was modelled on that of the original historical glasses. Our studies have shown that glass composition, climatic conditions and biofilm formation are factors which interact synergetically. It could be observed that various biofilms grow differently on the same type of model glass and that the same type of biofilm shows a different development on various model glasses. The decisive factors for the effectiveness of biofilm ablation by laser irradiation is the formation of the biofilm on the one hand and its corrosive potential on account of its ability to accumulate moisture and to produce glass-damaging metabolites on the other. Glasses of low chemical stability promote the growth of dense biofilms and can be cleaned only with a high energy density, whereas glasses of high chemical stability merely allow for a slow growth of a biofilm spreading two-dimensionally on the glass surface which can be gently removed using low energy density. © 2000 É ditions scientifiques et médicales Elsevier SAS Keywords: historical glass / biofilm / biocorrosion / laser cleaning / excimer-laser * Correspondence and reprints: labor@lab-gnm.de U. Drewello et al. /
Journal of Cultural Heritage, 2001
The application of lasers for the removal of superficial deposits from historic stained glass is ... more The application of lasers for the removal of superficial deposits from historic stained glass is a comparatively new field of scientific interest. Experimental studies concerning the behaviour of glass substrates and the corresponding superficial deposits towards different laser wavelengths were carried out. The experiments were performed using wavelengths of λ = 193 nm (ArF-Excimer), 308 nm (XeCl-Excimer), 355 nm (Nd:YAG third harmonic) and 1 064 nm (Nd:YAG fundamental) in comparison to λ = 248 nm (KrF-Excimer). This comparison is due to the fact that the present knowledge is based on the 248 nm wavelength. Specially prepared model glass samples representing the original fragments and samples of organic polymers (formerly used as a protective material for historic stained glasses) were used to study the effects of laser radiation and were subsequently characterised by optical microscopy. © 2001 Éditions scientifiques et médicales Elsevier SAS laser cleaning / glass / different wavelengths
Journal of Cultural Heritage, 2000
A KrF-excimer laser operating at l = 248 nm was used for basic studies in cleaning ancient glass ... more A KrF-excimer laser operating at l = 248 nm was used for basic studies in cleaning ancient glass surfaces. For irradiation a mask projection technique was applied. A modified optical set-up was designed using cylindrical lenses for large area removal by line scanning. Previous investigations revealed insufficient knowledge about interaction processes between UV-laser radiation and individual surface layers of encrusted historical glass. Thus, first detailed studies were carried out on special model glass samples simulating the behaviour of historical glass. The potential of removing crusts, bio layers as well as layers of different conservation materials (due to former conservation work) were examined. The avoidance of damaging material such as gel layers, paint layers or the bulk glass was of great importance. Removal rates and thresholds for the materials mentioned above were carried out. The collected data enables a comparison and evaluation of the feasibility for the removal of superficial layers from historical glass artefacts. The results indicate that in some cases a closed loop process control will be necessary to avoid over-cleaning. © 2000 É ditions scientifiques et médicales Elsevier SAS
Studies in Conservation, 2008
... Agnes W. Brokerhof, Margrit Reuss, Fiona MacKinnon, Frank Ligterink, Han Neevel, Farideh Fekr... more ... Agnes W. Brokerhof, Margrit Reuss, Fiona MacKinnon, Frank Ligterink, Han Neevel, Farideh Fekrsanati and Graeme Scott ... Mounted and exhibited 1-4467a Paper 0.06 0.49 0.82 Red 0.12 0.56 0.92 Purple 0.27 0.36 1.13 Pink 0.18 0.30 0.71 1-4468-3 Paper 0.05 0.64 1.31 Dark ...
Optics and Lasers in Biomedicine and Culture, 2000
... Lasers in Historical Glass Cleaning Klaus Dickmann1, Jens Hildenhagen1, Farideh Fekrsanati1,H... more ... Lasers in Historical Glass Cleaning Klaus Dickmann1, Jens Hildenhagen1, Farideh Fekrsanati1,Hannelore Romich2, Carola ... Fundamental studies were carried out on laser removal of variousde-posits from ... of laser fluence H (x) into the material is given by Beer's fluenceTT' Fig ...
Journal of the Institute of Conservation, 2010
... his collection, a description of the technical solutions we arrived at and an analysis of the... more ... his collection, a description of the technical solutions we arrived at and an analysis of the ... picture glass was therefore chosen, meaning that there would be a greater risk of breakage ... This package was fitted into the frame as normal, using a hardboard backing sheet and spring ...
Journal of Cultural Heritage, 2000
The ablation of biofilms by excimer laser radiation was systematically examined in a series of mo... more The ablation of biofilms by excimer laser radiation was systematically examined in a series of model studies during which the biofilms originating from different historical panels were simulated on model glasses. The composition of these model glasses was modelled on that of the original historical glasses. Our studies have shown that glass composition, climatic conditions and biofilm formation are factors which interact synergetically. It could be observed that various biofilms grow differently on the same type of model glass and that the same type of biofilm shows a different development on various model glasses. The decisive factors for the effectiveness of biofilm ablation by laser irradiation is the formation of the biofilm on the one hand and its corrosive potential on account of its ability to accumulate moisture and to produce glass-damaging metabolites on the other. Glasses of low chemical stability promote the growth of dense biofilms and can be cleaned only with a high energy density, whereas glasses of high chemical stability merely allow for a slow growth of a biofilm spreading two-dimensionally on the glass surface which can be gently removed using low energy density. © 2000 É ditions scientifiques et médicales Elsevier SAS Keywords: historical glass / biofilm / biocorrosion / laser cleaning / excimer-laser * Correspondence and reprints: labor@lab-gnm.de U. Drewello et al. /
Journal of Cultural Heritage, 2001
The application of lasers for the removal of superficial deposits from historic stained glass is ... more The application of lasers for the removal of superficial deposits from historic stained glass is a comparatively new field of scientific interest. Experimental studies concerning the behaviour of glass substrates and the corresponding superficial deposits towards different laser wavelengths were carried out. The experiments were performed using wavelengths of λ = 193 nm (ArF-Excimer), 308 nm (XeCl-Excimer), 355 nm (Nd:YAG third harmonic) and 1 064 nm (Nd:YAG fundamental) in comparison to λ = 248 nm (KrF-Excimer). This comparison is due to the fact that the present knowledge is based on the 248 nm wavelength. Specially prepared model glass samples representing the original fragments and samples of organic polymers (formerly used as a protective material for historic stained glasses) were used to study the effects of laser radiation and were subsequently characterised by optical microscopy. © 2001 Éditions scientifiques et médicales Elsevier SAS laser cleaning / glass / different wavelengths
Journal of Cultural Heritage, 2000
A KrF-excimer laser operating at l = 248 nm was used for basic studies in cleaning ancient glass ... more A KrF-excimer laser operating at l = 248 nm was used for basic studies in cleaning ancient glass surfaces. For irradiation a mask projection technique was applied. A modified optical set-up was designed using cylindrical lenses for large area removal by line scanning. Previous investigations revealed insufficient knowledge about interaction processes between UV-laser radiation and individual surface layers of encrusted historical glass. Thus, first detailed studies were carried out on special model glass samples simulating the behaviour of historical glass. The potential of removing crusts, bio layers as well as layers of different conservation materials (due to former conservation work) were examined. The avoidance of damaging material such as gel layers, paint layers or the bulk glass was of great importance. Removal rates and thresholds for the materials mentioned above were carried out. The collected data enables a comparison and evaluation of the feasibility for the removal of superficial layers from historical glass artefacts. The results indicate that in some cases a closed loop process control will be necessary to avoid over-cleaning. © 2000 É ditions scientifiques et médicales Elsevier SAS
Studies in Conservation, 2008
... Agnes W. Brokerhof, Margrit Reuss, Fiona MacKinnon, Frank Ligterink, Han Neevel, Farideh Fekr... more ... Agnes W. Brokerhof, Margrit Reuss, Fiona MacKinnon, Frank Ligterink, Han Neevel, Farideh Fekrsanati and Graeme Scott ... Mounted and exhibited 1-4467a Paper 0.06 0.49 0.82 Red 0.12 0.56 0.92 Purple 0.27 0.36 1.13 Pink 0.18 0.30 0.71 1-4468-3 Paper 0.05 0.64 1.31 Dark ...