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Proceedings Paper

NDT testing by holographic interferometry applied to the structural diagnostic of artwork conservations by means of sound wave excitation
Author(s): Fabio Vincitorio; Alberto Ramil; Ana J. López; Emilio Saavedra; Armando Yáñez
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Paper Abstract

Techniques based on holographic interferometry have achieved a mature state of non destructive testing applications in industry and nowadays they are rising as interesting and promising tools in the field of conservation practices; giving information about the condition of structural integration of artworks. In the practice of these techniques it is necessary to generate a relative deformation in the object under study. Depending of the characteristics of the artwork, different methods may be used to achieve the desired displacement; being thermal excitation by means of filament lamps and wave sounds generated by speakers the most common. By applying these methods the deformation process usually involves a large area of the object, which limits the information obtained of a finite region. However, the use of a wave sound emitter of small dimensions, like a low power monotone buzzer, allows to decrease the affected area and to obtain information about the structural integrity of localized points of the surface. In the present study conventional double exposure double way holographic technique based on holographic films was used to obtain an out of plain deformation pattern caused by a sound emitter in an oil painting which has suffered heavy structural damage. Optimization of the excitation sound wave characteristics (frequency and amplitude) and the adjustment and calibration of the experimental set up, in order to obtain precise information about the physical and mechanical integrity of localized points of the painting are reported.

Paper Details

Date Published: 17 June 2008
PDF: 8 pages
Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 70980I (17 June 2008); doi: 10.1117/12.802991
Show Author Affiliations
Fabio Vincitorio, Univ. Tecnológica Nacional (Argentina)
Alberto Ramil, Univ. da Coruña (Spain)
Ana J. López, Univ. da Coruña (Spain)
Emilio Saavedra, Univ. da Coruña (Spain)
Armando Yáñez, Univ. da Coruña (Spain)

Published in SPIE Proceedings Vol. 7098:
Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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