Lasers in the Conservation of Artworks: LACONA VI by John F. Asmus (auth.), Mag Johann Nimmrichter, Professor

By John F. Asmus (auth.), Mag Johann Nimmrichter, Professor Wolfgang Kautek, Professor Manfred Schreiner (eds.)

Within the final a long time, using lasers in works of art conservation turned an immense software for lots of conservators, scientists, architects and different specialists, who're concerned about the care of monuments and artefacts or laser expertise. For the 1st time in 1995 Professor Costas Fotakis introduced jointly restorers and scientists to debate the possibility of lasers in paintings conservation. considering that then the sector of "Lasers within the Conservation of works of art" has received vastly in significance. these days restorers and laser scientists paintings shut jointly that allows you to improve new fields of functions over the past years. additionally a number of nationwide and foreign examine initiatives were performed by way of conservator-restorers, architects and scientists. within the final 10 years a couple of historic and creative top of the range monuments (e.g. St. Stephens Cathedral in Vienna) were wiped clean or measured through laser and taken the laser within the spectra of instruments that are valuable within the brilliant box of artistic endeavors. The complaints of the congress addresses scientists, conservator-restorers, businesses, architects, decision-makers and different specialists keen on conservation tasks or within the examine of latest laser equipment.

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Additional info for Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21–25, 2005

Sample text

The results shown here are for the moderate corrosion samples but it is clear that even the micro-blasting techniques are less effective than they were in the case of the deeper grooves. The reason for this decrease in the signal to noise ratio is simply that the shallower grooves represent a ‘weaker signal’ than the deeper ones. This ‘weaker signal’ is more easily lost under the action of the corrosion process. 4 Discussion Reviewing all the results presented so far it is clear that the best cleaning results are obtained by the micro-blasting processes and the next most effective techniques involve the use of an Nd:YAG laser on a wet surface.

06 Fig. 3. 25 mm grooves and moderate corrosion seems likely that, in the case of the wet cleaned surface, the water infiltrated these cracks and pores. The incident laser has a wavelength (1,064 nm) which would pass though any surface water without being absorbed by it. The laser energy would be absorbed by the solid oxide layer which would rapidly heat up the water in the cracks and pores. The transfer of the heat from the solid to the surrounding water has been noted by Zapka et al. [4] and Grigoropoulos and Kim [5].

However, so far, the nonportable apparatus can only be used under laboratory conditions, whereas the Nd:YAG laser can be used at construction sites and moreover can be worked manually. g. copper sulphides and copper sulphates) not belonging to the original are removed. In doing so, as far as possible, the original surface of the work of art should not be altered by abrasion or chemical or physical processes, resulting in colour changes, loss of historical traces of work and polishing marks which accompany them.

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