New applications of lasers to architecture and civil engineering: laser remediation of sandstone contaminated with microbial growth and bryophyte

Watson, I. A. , You, A., Oon, S. W. and Stewart-Tull, D. E.S. (1996) New applications of lasers to architecture and civil engineering: laser remediation of sandstone contaminated with microbial growth and bryophyte. Review of Laser Engineering, 24(2), pp. 165-173. (doi:10.2184/lsj.24.165)

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Publisher's URL: http://dx.doi.org/10.2184/lsj.24.165

Abstract

CO<sub>2</sub> and Nd:YAG lasers were used to clean carboniferous and blonde sandstone which were contaminated with pollution, microbial growth and bryophyte. The effect of translation velocity was investigated to find the optimum value for cleaning. Analysis of the stone, after laser treatment and 15 month's exposure to the Glaswegian climate, indicated that no growth, recontamination or effects of pollution had occurred for some settings of the laser parameters. Energy dispersive x-ray spectroscopy was used to quantify the efficacy of laser remediation by analysing the chemical composition of the stone's surface in the treated and untreated regions after laser treatment. The aluminium content of the sample was found to give the most sensitive measure of the CO<sub>2</sub> laser cleaning efficiency.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stewart-Tull, Prof Duncan and Watson, Dr Ian
Authors: Watson, I. A., You, A., Oon, S. W., and Stewart-Tull, D. E.S.
College/School:College of Medical Veterinary and Life Sciences
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Review of Laser Engineering
Publisher:Laser Society of Japan
ISSN:0387-0200

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