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Laser shearography can be used to study the motion of a painting during an excitation. The real-time recording of the whole image is of great importance for analysis, especially for paintings with multiple layers, which can be difficult to unwrap to obtain a displacement map for strain. A 4.4 mW continuous wave laser with a wavelength of 808 nm is chosen to generate the interference patterns in the painting surface and provides high enough power to burn through the paint layer and be absorbed by the white support. The interference patterns can be collected by a CCD camera at a rate of 24 frames per second, which can be easily acquired in a museum environment. The images collected at the painting surface are used to create a displacement gradient map, which can be unwrapped to generate a strain map, as illustrated in Fig. 15. The image is also used to estimate the displacement of the painting at the interface between the painting and the support surface. These results can be used to study the changes in the mechanical properties of a painting over time, show the progression of degradation, and predict the future state of a painting. The initial images collected from the painting surface are subtracted from the final images to show the difference in the displacement of the painting at the interface. The difference map allows researchers to study the dynamic deformation of the painting during the excitation. The results provide valuable information about the deformation of the painting and its components that can be applied to the development of an effective conservation methodology.
For accurate image collection in a museum environment, a significant consideration is whether an ambient light or darkroom environment is a potential challenge to an experiment with enough space for a large piece of artwork. An experiment performed with a large piece of artwork in a museum setting showed that the density of the interference patterns collected after thermal loading in the painting was similar to that collected in a darkroom environment. The use of an artificial light source of 1.5 mW with a beam diameter of 2 cm was used for the thermal loading experiment. This laser light source is similar to the average light sources found in museums and also generated a sufficient amount of heat to raise the temperature of the experimental painting to 50 oC in a few minutes. The images of the moving interference patterns were acquired just before and after the thermal loading.
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