A non-destructive, contactless technique for the health monitoring of ancient frescoes
In this paper an innovative non-destructive, contactless technique applied to the health monitoring of ancient frescoes is presented. The problem of the health monitoring of artistic frescoes without a direct interaction with structures and paintings is of great concern in the field of art restoration and preservation. In artistic frescoes, the partial detachment of plaster portions is a typical and serious problem. Both layer-to-layer detachments and delaminations and surface cracks are usually present in ancient wall paintings. At present, the standard procedure of diagnosis consists of manual inspection, but produces only approximate information. This paper describes an acoustic, non-invasive, experimental technique of diagnosis, based on the acoustic-structural interaction which occurs when a fresco wall is excited by a loudspeaker. The analysis of the acoustic pressure field and of its alterations allows the assessment of detachments, since the acoustic modal parameters are affected by the acoustic system boundary conditions, i.e. the portion of analyzed fresco. The reconstruction of the modal behavior of the analyzed portion of the fresco is made by a scanning laser Doppler which measure the velocity field of the observed surface. It is a non-contact measure technique that provides a great accuracy. Experiments carried out on fresco artificial specimens show the potential of the technique.
KeywordsNDT frequency-based identification method fresco health monitoring
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- 1.AA.VV. Tecniche e linguaggio del restauro. La decorazione murale e la sua conservazione. Electa, Milano. 2007. (in italian)Google Scholar
- 2.Torraca G. I dipinti murali. Da: Problemi di conservazione, a cura di G. Urbani. Ed. Compositori, Bologna. 1973. (in italian)Google Scholar
- 4.Tornari V., et al. Laser multitask non destructive technology in conservation diagnostic procedures. 2005 Conference on Lasers and Electro-Optics Europe. Munich, Germany, 12–17 June 2005.Google Scholar
- 5.Castellini P., Esposito E., Marchetti B., Paone N., Tomasini E.P. New applications of Scanning Laser Doppler Vibrometry (SLDV) to non-destructive diagnostics of artworks: mosaics, ceramics, inlaid wood and easel painting. Journal of Cultural Heritage. 2003;4(S1):321–329.Google Scholar
- 6.Castellini P., Revel G.M. Damage Detection by Laser Vibration Measurement. Proceedings of 15th World Conference on Nondestructive Testing, Roma, 15–21 October 2000.Google Scholar
- 7.Esposito E., Del Conte A., Agnani A., Stocco R. Impiego integrato di strumentazione NDT nel parco archeologico di Pompei. In Conoscere Senza Danneggiare - Convegno Nazionale AIMAN, Ancona 6 giugno 2006.Google Scholar
- 8.Esposito E. Recent developments and applications of laser Doppler vibrometry to cultural heritage conservation. 2005 Conference on Lasers and Electro-Optics Europe. Munich, Germany, 12–17 June 2005.Google Scholar
- 10.Vignola J.F., et al. Locating faults in wall paintings at the U.S. Capitol by shaker based laser vibrometry. APT Bulletin: Journal of Preservation Technology. 2005;36(1):25–33.Google Scholar