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Artwork diagnostics with fiber-optic digital speckle pattern interferometry.

D Paoletti, G S Spagnolo, M Facchini

    Applied Optics
    |September 22, 2010
    PubMed
    Summary

    A new fiber-optic interferometer enables nondestructive testing of artwork by mapping deformations under thermal stress. This simple, accurate system works in harsh environments, offering real-time insights for art conservation.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Art Conservation Science

    Background:

    • Nondestructive testing (NDT) is crucial for preserving cultural heritage.
    • Traditional interferometry methods can be complex and sensitive to environmental conditions.
    • Assessing the structural integrity of artwork, like wooden panels and frescoes, requires precise deformation analysis.

    Purpose of the Study:

    • To evaluate the feasibility of using a digital speckle pattern interferometer with optical fibers for NDT of artwork.
    • To develop a simple, accurate, and robust fiber-optic interferometer for real-time measurements.
    • To create deformation maps of artwork under thermal stress.

    Main Methods:

    • Development of a fiber-optic digital speckle pattern interferometer.

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  • Realization of a system with minimal optical components and adjustments.
  • Application of the interferometer to laboratory models and in situ mural frescoes.
  • Induction of thermal stress to observe deformation.

    • Main Results:

    • A functional fiber-optic interferometer capable of real-time measurements in challenging environments was successfully realized.
    • The system demonstrated the ability to depict deformation maps of various artwork types.
    • Experimental validation was achieved on both laboratory samples and actual mural frescoes.

    Conclusions:

    • Digital speckle pattern interferometry with optical fibers is a viable technique for the NDT of artwork.
    • The developed interferometer offers a practical solution for analyzing artwork deformation in situ.
    • This technology aids in the conservation and understanding of cultural heritage objects.