The two-wavelength laser cleaning methodology has been introduced and developed in order to meet demanding cleaning challenges in CH.
The Parthenon West Frieze was the first assemblage from the Acropolis to benefit from this laser cleaning methodology (2002 2005).
Another cleaning challenge that has been effectively approached with the two-wavelength laser cleaning methodology is the removal of dark over-layers from plaster objects.
A comprehensive description of the technique includes microfabrication details, the laser Doppler methodology for extracting the resonant frequency, uncertainty analysis, and a model for data interpretation.
Upon the completion of the Parthenon West Frieze blocks, the laser cleaning methodology has been employed for the cleaning of a number of sculptures from the Parthenon, the Erechtheion and the Temple of Athena Nike.
Furthermore, in recent research Hackenberg et al. (2014) utilised terrestrial laser scanning methodology for the analysis and prediction of total volume and merchantable timber volume (diameter over 7 cm) of wild cherry on the same study site, allometric models were constructed as a method of ground truthing the point cloud data.
Among the 3D imaging sensors [26, 27] we decided to use the single point laser triangulation methodology due to: (i) the high accuracy in a given field of view, (ii) the inherent insensitivity to the environmental illumination conditions, and (iii) the high acquisition rate [28].
The irradiated areas shown in Fig. 3 illustrate the superiority of the two-wavelength laser cleaning methodology as regards the final colour, surface morphology and homogeneity of the cleaned areas, while indicating the limitations of the individual IR and UV cleaning regimes, as well as of their SQ use.
Perhaps the difference could result in part from microcirculatory heterogeneity, something not assessed by the laser Doppler methodology used in this study.
For the implementation of femtosecond (fs) laser cleaning methodologies of light-sensitive substrates as those encountered in artistic paintings, the interaction between fs laser pulses and painting components has to be well characterized.
