Holographic applications in evaluation of defect and cleaning procedures

Tornari, Vivi; Bonarou, Antonia; Zafiropulos, V.; Fotakis, C.; Doulgeridis, Michaelis

doi:10.1016/s1296-2074(00)00168-0

Cited by 18 publications

(4 citation statements)

References 6 publications

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“…Tornari et al [49] have used holographic interferometry very recently as a part of a detailed study of an icon 68 REVIEWS IN CONSERVATION NUMBER 6 2005 during restoration in order to reveal hidden defects and regions of localised stress. The reference image was taken before cleaning and another image was taken after treatment.…”

Section: Holographic and Electronic Speckle Pattern Interferometrymentioning

confidence: 99%

Deformation and strain measurement techniques for the inspection of damage in works of art

Dulieu-Barton¹,

Dokos²,

Eastop³

et al. 2005

Studies in Conservation

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The engineering techniques used for inspecting structural damage are not widely known in the conservation sector. Techniques are available based on deformation or strain measurement that have the ability to provide quantitative data. This paper reviews currently available techniques, covering point-strain measurements using resistance strain gauges and fibre-optic sensors, as well as full-field optical measurement approaches such as holography, electronic speckle pattern interferometry, photoelastic stress analysis and photogrammetry. The underlying technology of each of the techniques is described for the non-specialist. The relevance of each technique is established from a conservation perspective through accounts of usage. The application of the techniques to a wide range of artwork, including panel paintings, statues, murals and mosaics is described and the results critically reviewed. The paper also provides an insight into possible future applications of the techniques and identifies areas for further investigation.

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Section: Holographic and Electronic Speckle Pattern Interferometrymentioning

confidence: 99%

Deformation and strain measurement techniques for the inspection of damage in works of art

Dulieu-Barton¹,

Dokos²,

Eastop³

et al. 2005

Studies in Conservation

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“…Full field optical techniques for deformation measurement have been developed as an alternative and demonstrated on various types of works of art, which exhibit internal defects in the form of delaminations. In particular interferometric techniques [34], among which holographic interferometry [34,35], electronic speckle interferometry [36] and [37], shearography and terahertz imaging [38] have been successfully demonstrated for structural damage assessment on several types of artworks; however, their application to large surfaces is still challenging and, again, they require skilled operators with expertise on the specific measurement technique. Acoustic based diagnostics is a further contactless method which has been applied to structural damage identification in paintings, the acoustic energy absorption coefficient of the panel tested being correlated to its stratigraphy [39].…”

Section: Introductionmentioning

confidence: 99%

Soft-sensing reconstruction of in-depth defect geometry from active IR-thermography data

Castellini¹,

Martarelli²,

D'Antuono³

et al. 2020

Meas. Sci. Technol.

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This paper proposes a new approach for processing measured data from active Infra Red (IR) thermography, where a soft sensing algorithm is exploited for in depth defect reconstruction. This is achieved by propagating the information gathered at the wall surface to the inner layers. Correlating the experimental 2D measurements to a Finite Element (FE) model of the tested specimen it is possible to update the model with the measured data and change the geometry of the simulated inner defect, until the surface temperature distribution calculated corresponds to the measured one. Following that strategy, the unknown defect geometry can be determined. The method developed and presented in this paper consists of an optimization problem based on the minimization of the difference between the surface temperature distribution measured on the sample subjected to an active thermography test and the one resulting from the FE model. The optimization variables are the geometrical parameters (depth, width, thickness and position) characterizing the defect which will be fully determined at the complete convergence, within a given tolerance, of the optimization problem. The method includes also a preprocessing algorithm, based on the same experimental data and FE model, which allows to determine thermal and mechanical properties of the object under test, like surface emissivity, heat capacity and material conductivity and density, which are often unknown especially in the case of works of art. This soft-sensing procedure has been applied to a virtual experiment to estimate the accuracy of the reconstructed geometry and to a simulacrum of ancient fresco including defects realized on purpose.

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“…Since then different groups have contributed significantly to this field of research. One can cite Paoletti and Spagnolo, whom review paper [2] is a significant summary of their work and work of others, the Oldenburg University [3][4][5][6] and finally the Institute of Electronic Structure and Laser of Heraklion [7][8][9][10]. The two first groups have considered portable ESPI systems for the diagnostics of artworks and historical monuments on site, while the Heraklion group considered classical holographic systems with higher resolution or different other techniques such as laser vibrometry.…”

Section: Introductionmentioning

confidence: 99%

Role of dynamic holography with photorefractive crystals in a multi-functional sensor for the detection of signature features in movable cultural heritage

Thizy

Georges

Doulgeridis³

et al. 2007

SPIE Proceedings

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This paper is one of a series submitted by the Multi-Encode Project consortium and covers the development of holographic interferometry with dynamic photorefractive crystals. The aim of the first phase of the project is to assess the existing techniques for detection of signatures in various types of artworks. The trademark of our technique is a very high resolution in the fringe pattern. We will show the potentiality of our technique for the present application.

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Holographic applications in evaluation of defect and cleaning procedures

Cited by 18 publications

References 6 publications

Deformation and strain measurement techniques for the inspection of damage in works of art

Deformation and strain measurement techniques for the inspection of damage in works of art

Soft-sensing reconstruction of in-depth defect geometry from active IR-thermography data

Role of dynamic holography with photorefractive crystals in a multi-functional sensor for the detection of signature features in movable cultural heritage

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