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Hyperspectral Imaging as a Non Destructive Technique to Control the Laser Cleaning of Graffiti on Granite

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Abstract

The progress of the laser cleaning of two graffiti paints on coarse-grained granite was in situ followed up by the hyperspectral imaging technique, through the calculation of a quantitative index based on a linear spectral mixture analysis model, which provided an estimation of the cleaning level attained along the process. The laser used was a nanosecond pulsed Nd:YVO\(_{4}\) source, at 355 nm wavelength and, in order to validate the results of laser cleaning, conventional analytical techniques as optical microscopy, scanning electron microscopy with energy dispersive X-ray spectrometry, Fourier transform infrared spectroscopy and spectrophotometer colour measurements were also implemented. The results indicated that hyperspectral imaging technique is a reliable tool to in situ control the process of laser cleaning of graffiti in coarse-grained granites in order to determine the laser scans enough to achieve the best possible cleaning without modifying the granitic substrate.

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Acknowledgments

This work was supported by the Spanish Research Project BIA2014-54186-R. M. P. Fiorucci’s work was partially financed by the Project: A- TEMPO Avances en tecnologías marinas: producción naval y Offshore. J. S. Pozo-Antonio was supported by a postdoctoral contract with the University of Vigo within the framework of the 2011–2015 Galician Plan for Research, Innovation and Growth (Plan I2C) for 2014. SEM and ATR-FTIR analysis were performed at the Centro de Apoyo Científico y Tecnológico a la Investigación—CACTI University of Vigo.

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Author notes

  1. J. S. Pozo-Antonio

    Present address: CERENA, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal

Authors and Affiliations

  1. Departamento de Enxeñaría dos Recursos Naturais e Medioambiente, Escola Superior de Minas, Universidade de Vigo, 36310, Vigo, Spain

    J. S. Pozo-Antonio & T. Rivas

  2. Laboratorio de Aplicacións Industriais do Láser, Departamento de Enxeñaría Industrial II, Escola Politécnica Superior, Centro de Investigacións Tecnolóxicas, Universidade da Coruña, Campus Ferrol, 15471, Ferrol, Spain

    M. P. Fiorucci, A. Ramil & A. J. López

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  1. J. S. Pozo-Antonio
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  2. M. P. Fiorucci
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  3. A. Ramil
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  4. T. Rivas
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  5. A. J. López
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Correspondence to J. S. Pozo-Antonio.

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Pozo-Antonio, J.S., Fiorucci, M.P., Ramil, A. et al. Hyperspectral Imaging as a Non Destructive Technique to Control the Laser Cleaning of Graffiti on Granite. J Nondestruct Eval 35, 44 (2016). https://doi.org/10.1007/s10921-016-0361-9

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