A new portable spectral imaging system is herein presented capable of acquiring images of high resolution (2MPixels)
ranging from 380 nm up to 950 nm. The system consists of a digital color CCD camera, 15 interference filters covering
all the sensitivity range of the detector and a robust filter changing system. The acquisition software has been developed
in "LabView" programming language allowing easy handling and modification by end-users. The system has been tested
and evaluated on a series of objects of Cultural Heritage (CH) value including paintings, encrusted stonework, ceramics
etc. This paper aims to present the system, as well as, its application and advantages in the analysis of artworks with
emphasis on the detailed compositional and structural information of layered surfaces based on reflection & fluorescence
spectroscopy. Specific examples will be presented and discussed on the basis of system improvements.
A critical challenge for the broader implementation of laser cleaning interventions in
modern paintings is the assessment of the extent of any photochemical or structural
modifications induced in the original substrate following laser irradiation. For this reason, we
investigate several polymeric materials (PMMA, Paraloid B72) doped with aromatic
photosensitisers (PhenI, POPOP) of known photochemistry, coated with uniform layers of
acrylics of different thicknesses to simulate real case scenarios. Following laser irradiation, a
variety of spectroscopic techniques LIF, MPEF are employed for the in depth monitoring of
any photochemical and structural modifications induced in the bulk material.
In this paper, we present research carried out in our laboratory in the field of applications of high power lasers in cleaning surfaces. More specifically, overviews of three different applications are presented; the use of lasers in the cleaning of marble antiquities, in the restoration and cleaning of painted artworks nad in the repair of the paint of ship hulls.
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