Characterization of Laser-Generated Microparticles by Means of a Dust Monitor and SEM Imaging

Wurster, Roland; Pentzien, Simone; Conradi, Andrea; Krüger, Jörg

doi:https://doi.org/10.1155/2006/31862

Laser Chemistry

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Lasers in the Preservation of Cultural Heritage

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Research Article | Open Access

Volume 2006 | Article ID 031862 | https://doi.org/10.1155/2006/31862

Characterization of Laser-Generated Microparticles by Means of a Dust Monitor and SEM Imaging

Roland Wurster,¹Simone Pentzien,²Andrea Conradi,²and Jörg Krüger²

Academic Editor: Costas Fotakis

Received13 Sept 2006

Revised09 Nov 2006

Accepted16 Nov 2006

Published27 Dec 2006

Abstract

Nanosecond laser (1064 nm wavelength) cleaning of artificially soiled paper as a model sample simulating a real-world artwork was performed. During the cleaning process, the ejection of particles was monitored in situ by means of a dust monitor (8 size classes, ranging from 0.3 μm to >2 μm) and ex situ using a mini-cascade impactor (MKI, 5 stages). The cleaning result was analyzed by scanning electron microscopy (SEM) considering possible laser-induced damages to the substrate. Size distributions of emitted particles were measured depending on the processing parameters: laser fluence, F, and pulse number per spot, N. High numbers of large (>2 μm) particles were collected by the mini-cascade impactor indicating a gas dynamical liftoff process. Obviously, these particles were not affected by the laser-matter interaction. The different methods (SEM, MKI, and dust monitor) are compared with respect to their usefulness for a proper interpretation of the cleaning results.

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Copyright

Copyright © 2006 Roland Wurster et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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