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This work deals with the examination of artwork by photothermal radiometry. It was initiated at the time of the restoration of a florentine XIV century mural painting, the Saint Christopher of the Louvre Museum. The aim of this work is to evaluate the possibilities of photothermal radiometry concerning detection of deterioration of internal structure of painting, non visible on surface. The study concentrated on the detection of separations of coating and the existing air voids between the various layers of the support, which create zones of brittleness which often requires an intervention of consolidation. The photothermal analysis was initially carried out on a counterpart of the fresco. In a second time it is the Saint Christopher itself which was controlled. The results obtained clearly show the possibility of detecting defects located in such works of art. The correlation between the information collected by photothermal analysis and traditional acoustic sounding was demonstrated and finally shows the interest to associate these two methods of non-destructive testing.

Infra-red photothermal thermography: A tool of assistance for the restoration of murals paintings?