Heat Transfer Effects on Defect Boundaries Captured by Digital Holographic Interferometry and Infrared Thermography Workstation: an Overview on Experimental Results
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The heat transfer effect is observed from existing defects through heat diffusion to the sound area of the sample in long term after the sample has reached values close to the initial, signifying equilibrium with the environment. Two complementary systems providing the kinetic and thermal information of the samples were used to construct a real-time monitoring workstation in order to monitor the real-time responses of the sample after thermal excitation. Results indicate that the defect boundaries and the sound non-defect area continue to exchange thermal values long after the total area of the sample reaches initial temperature in equilibrium with environment. Hence, it is here suggested that the continuous aging of artworks in controlled environments may be a result of the ongoing low thermal heat transfer from the defect to the sound areas provoking a slow but steady surface displacement and consequently deterioration mechanism against the preventive conservation measures based on environmental equilibrium.
KeywordsHolographic interferometry Speckle interferometry Infrared thermography Fresco Defect Defect boundaries Heat transfer Diagnostics DHSPI SIRT
The experiment was carried out in the premises of the holographic metrology laboratory at the Institute of Electronic Structure and Laser of the Foundation for Research and Technology-Hellas (IESL-FORTH) and is currently being supported by the European project “Integrated Platform for the European Research Infrastructure on Cultural Heritage”, IPERION CH (Grant, Agreement: 654028) and the EU Ultraviolet Laser Facility (ULF) at IESL-FORTH.
Special thanks go to the colleagues of Centre de Recherché et de Restauration des Musées de France (C2RMF) Dr. Vincent Detalleand Laboratoire de Recherché des Monuments Historiques (LRMH) Dr. David Giovannacci for their cooperation in the work package of IPERION project within which this study was performed.
Compliance with Ethical Standards
Conflict of Interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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