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The improvement of technologies and the increase in the need for safety in the airports lead to the development of non-destructive testing devices using terahertz waves. These waves present indeed, the advantage of being on the one hand relatively penetrating. They have the advantage in addition of not being ionizing. It is thus potentially of an interesting contribution in the field of the non destructive testing. With the help of the VISIOM Company, we then approached the possibilities of this new method of analysis for the assistance to the restoration of the works of art. We show here, on the one hand that the method allow, like the photothermal method, the detection of defects located in murals paintings or marquetries. We show in addition that the method allows the detection of defects potentially masked by other defects, which does not allow stimulated infra-red thermography. We show in the third time, that the method does not seem sensitive to the various pigments constituting the pictorial layer, which constitutes also an advantage compared to the photothermal method. We show finally, that the terahertz method is limited as regards analysis of low-size defects, which is not the case of stimulated infra-red thermography.

Non destructive testing of works of art by stimulated infrared thermography and terahertz analysis