Cleaning of polluted sandstone using an Nd:YAG laser

Daniel McStay; S. Enrique; A. Siddiqui

doi:10.1117/12.182202

5 August 1994 Cleaning of polluted sandstone using an Nd:YAG laser

Daniel McStay, S. Enrique, A. Siddiqui

Proceedings Volume 2321, Second International Conference on Optoelectronic Science and Engineering '94; (1994) https://doi.org/10.1117/12.182202
Event: Optoelectronic Science and Engineering '94: International Conference, 1994, Beijing, China

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.

Citation Download Citation

Daniel McStay, S. Enrique, and A. Siddiqui "Cleaning of polluted sandstone using an Nd:YAG laser", Proc. SPIE 2321, Second International Conference on Optoelectronic Science and Engineering '94, (5 August 1994); https://doi.org/10.1117/12.182202

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