Actual laser removal of black soiling crust from siliceous sandstone by high pulse repetition rate equipment: effects on surface morphology

Authors

  • M. A. Iglesias-Campos Secció de Conservació-Restauració. Facultat de Belles Arts, Universitat de Barcelona - GRAPAC/CETEC-patrimoni, Universitat Autònoma de Barcelona–Institut Químic de Sarrià
  • J. L. Prada-Pérez GRAPAC/CETEC-patrimoni, Universitat Autònoma de Barcelona–Institut Químic de Sarrià

DOI:

https://doi.org/10.3989/mc.2016.02215

Keywords:

Sandstone, Laser Cleaning, Image Analysis, Roughness, Spectrophotometry

Abstract


This research project studies the role of pulse repetition rate in laser removal of black soiling crust from siliceous sandstone, and specifically, how laser fluence correlates with high pulse repetition rates in cleaning practice. The aim is to define practical cleaning processes and determine simple techniques for evaluation based on end-users’ perspective (restorers). Spot and surface tests were made using a Q-switched Nd:YAG laser system with a wide range of pulse repetition rates (5–200 Hz), systematically analysed and compared by macrophotography, portable microscope, stereomicroscope with 3D visualizing and area roughness measurements, SEM imaging and spectrophotometry. The results allow the conclusion that for operation under high pulse repetition rates the average of total energy applied per spot on a treated surface should be attendant upon fluence values in order to provide a systematic and accurate description of an actual laser cleaning intervention.

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Published

2016-03-30

How to Cite

Iglesias-Campos, M. A., & Prada-Pérez, J. L. (2016). Actual laser removal of black soiling crust from siliceous sandstone by high pulse repetition rate equipment: effects on surface morphology. Materiales De Construcción, 66(321), e078. https://doi.org/10.3989/mc.2016.02215

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Section

Research Articles

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