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Proceedings Paper

Automated analysis of art object surfaces using time-averaged digital speckle pattern interferometry
Author(s): Michal Lukomski; Leszek Krzemien
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Paper Abstract

Technical development and practical evaluation of a laboratory built, out-of-plane digital speckle pattern interferometer (DSPI) are reported. The instrument was used for non-invasive, non-contact detection and characterization of early-stage damage, like fracturing and layer separation, of painted objects of art. A fully automated algorithm was developed for recording and analysis of vibrating objects utilizing continuous-wave laser light. The algorithm uses direct, numerical fitting or Hilbert transformation for an independent, quantitative evaluation of the Bessel function at every point of the investigated surface. The procedure does not require phase modulation and thus can be implemented within any, even the simplest, DSPI apparatus. The proposed deformation analysis is fast and computationally inexpensive. Diagnosis of physical state of the surface of a panel painting attributed to Nicolaus Haberschrack (a late-mediaeval painter active in Krakow) from the collection of the National Museum in Krakow is presented as an example of an in situ application of the developed methodology. It has allowed the effectiveness of the deformation analysis to be evaluated for the surface of a real painting (heterogeneous colour and texture) in a conservation studio where vibration level was considerably higher than in the laboratory. It has been established that the methodology, which offers automatic analysis of the interferometric fringe patterns, has a considerable potential to facilitate and render more precise the condition surveys of works of art.

Paper Details

Date Published: 30 May 2013
PDF: 8 pages
Proc. SPIE 8790, Optics for Arts, Architecture, and Archaeology IV, 87900Y (30 May 2013); doi: 10.1117/12.2020476
Show Author Affiliations
Michal Lukomski, Jerzy Haber Institute of Catalysis and Surface Chemistry (Poland)
Leszek Krzemien, Jerzy Haber Institute of Catalysis and Surface Chemistry (Poland)


Published in SPIE Proceedings Vol. 8790:
Optics for Arts, Architecture, and Archaeology IV
Luca Pezzati; Piotr Targowski, Editor(s)

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