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Proceedings Paper

Cleaning of polluted sandstone using an Nd:YAG laser
Author(s): Daniel McStay; S. Enrique; A. Siddiqui
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Paper Abstract

The use of the fundamental and frequency doubled outputs of a Q-switched Nd:YAG laser as a rapid non-contact method for removing hydrocarbon pollutant layers from sandstone is reported. Color measurements of unpolluted stone were made using a Minolta Chroma meter to provide target values for the laser treatment. Color measurements and examination using a microscope of the polluted stone after laser treatment showed that 1064 nm laser pulses were most efficient at removing the polluted layer and at retaining the original color of the stone. The optimum laser pulse energy was found to be 6.8 mJ, above which damage to the stone surface occurred, resulting in a bleaching of the stone.

Paper Details

Date Published: 5 August 1994
PDF: 4 pages
Proc. SPIE 2321, Second International Conference on Optoelectronic Science and Engineering '94, (5 August 1994); doi: 10.1117/12.182202
Show Author Affiliations
Daniel McStay, Robert Gordon Univ. (United Kingdom)
S. Enrique, Robert Gordon Univ. (United Kingdom)
A. Siddiqui, Robert Gordon Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 2321:
Second International Conference on Optoelectronic Science and Engineering '94

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