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Zagadnienie wykorzystania ablacji laserowej w usuwaniu wtórnych nawarstwień z powierzchni dzieł sztuki i obiektów zabytkowych w architekturze

100%

Marczak J.

Ochrona Zabytków

2001

issue 3

233-251

The article discusses problems associated with the use of laser ablation in the removal of secondary build-up from the surface of works of art and monuments of architecture as well as the removal of micro-particles from the surface of industrial elements. The prime problem connected with mechanical methods o f cleaning is the erosion of the original surface located immediately underneath the build-up, which sometimes causes irrecoverable losses and gaps in the details (e.g. reliefs, traces of the instruments used by the sculptor, or traces of polychromy). For several years now, the laser method has been successfully applied for the removal of secondary build-up, also in Poland, by resorting to laser impulse radiation. A laser impulse with suitable energy (power) density is capable of removing, for instance, black crusts from assorted surfaces without damaging the base, which at times can be more fragile and delicate than the build-up itself. The main purpose of the article is to acquaint the reader with a new technology of removing build-up with the assistance of laser impulse radiation. The author discusses physical mechanisms leading to the removal of particles and b uild-up from the surfaces of assorted material in the course of the impact of long (100-1000) gs and short (5-100) ns laser impulses. The article also considers other effects accompanying the process of ablation, and presents select research results. The summary mentions joint features linked with the laser ablation of different material and the assets and faults of the application of laser technique in conservation; it also p re sents the basic principles of safety while working with laser equipment. Finally, the au th o r proposes general conclusions associated with the removal of b u ild -u p with the help of laser radiation.

CZYSZCZENIE LASEREM WYBRANYCH POWIERZCHNI KAMIENNYCH GROBU NIEZNANEGO ŻOŁNIERZA W WARSZAWIE

63%

Koss A., Marczak J.

Ochrona Zabytków

1999

issue 1

39-44

The article discusses the use (the first in Poland) of the Nd:YAG laser with Q modulation for the purposes of cleaning the surface of select stone elements of the Tomb of the Unknown Soldier in Warsaw. The authors consider the impact of the parameters of the laser beam upon the rapidity of the process and the thickness of the removed hard, black layers which amassed for the past several decades. The laser method of cleaning surfaces is the most effective and efficient, and, at the same time, the least aggressive and the most environment–friendly technique. It guarantees a selective removal of layers from the polluted surface and is highly convenient, especially in the case of conservation performed on high scaffolding.

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2 Ochrona Zabytków

2 Marczak J.

1 Koss A.

1 2001

1 1999

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Zagadnienie wykorzystania ablacji laserowej w usuwaniu wtórnych nawarstwień z powierzchni dzieł sztuki i obiektów zabytkowych w architekturze

CZYSZCZENIE LASEREM WYBRANYCH POWIERZCHNI KAMIENNYCH GROBU NIEZNANEGO ŻOŁNIERZA W WARSZAWIE