Non-destructive testing of an original XVI century painting on wood by ESPI system
Authors: Arena G., Paturzo M., Fatigati G., Grilli M., Pezzati L., Ferraro P.
Autors Affiliation: CNR, Inst E Caianiello, I-80078 Pozzuoli, Italy; Univ Suor Orsola Benincasa, I-80135 Naples, Italy; Ist Tecn Ind A Righi, I-80125 Naples, Italy; CNR, Natl Opt Inst, Florence, Italy; INNOVA SCARL, Ctr Sviluppo & Il Trasferimento Innovaz Nel Setto, I-80078 Pozzuoli, Italy
Abstract: Electronic Speckle Pattern Interferometry (ESPI), a non-contact and non-destructive optical techniques, was employed for assessing the conservation state of a XVI Century painting on wood (72x88x1,9 cm). By a long term analysis, the whole structure alterations, induced by the room temperature and relative humidity variations, were evaluated. Measurement of the whole painting structural bends was achieved. Local flaws and hidden detachments of pictorial layers from the support, which cannot be recognized by traditional art-restorer methods, were also revealed. This work was prevalently aimed at achieving a simple approach, in the laboratory practice, to get an intuitively user-friendly method for art conservators, not accustomed to high-tech or math based methods. The results demonstrate that ESPI can largely improve the traditional art conservation survey techniques.
KeyWords: Artwork diagnostics; ESPI; Holography; Interferometry; NDT; Wooden paintings