Monitoring detaching murals in the Convent of Müstair (Switzerland) by optical metrology

Hinsch, Klaus D.; Zehnder, Konrad; Joost, Hans‐Georg; Gülker, Gerd

doi:10.1016/j.culher.2008.06.011

Cited by 25 publications

(9 citation statements)

References 9 publications

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“…Since data structured in hierarchical layers preserves geometric information, the displayed information can be filtered according to the analysis goal. Finally, very little research in the field of conservation uses these tools to improve the diagnostic process on buildings [1], [20][21][22].…”

Section: Related Workmentioning

confidence: 99%

Developing a toolkit for mapping and displaying stone alteration on a web-based documentation platform

Stefani

Brunetaud

Janvier-Badosa

et al. 2014

Journal of Cultural Heritage

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Stone conservation at Chambord Castle and monitoring of its changes over time is actually an urgent necessity in order to preserve and enhance this historic and tourist site. Its porous stones suffer from degradation problems depending on physical and chemical parameters that are the origin of frequent restorations. The goal of this research is to supply authorities of the castle with a tool for scientific monitoring and decision support, based on the acquisition of alteration mapping and on the estimation of degradation patterns, in order to permit rational programming operations of restorations. This paper proposes an approach for digital documentation about the conservation state of buildings. The approach is based on the connection between a structured 3D model and structured 2D mapping data. In particular, in the NUBES web platform, a specific interface has been implemented, permitting the display and cross-reference of 2D mapping data on the 3D model in real time, by means of structured 2D layer-like annotations concerning stone degradation, dating, and material. Heritage conservation / 3D information system / stone degradation mapping / Vector graphics / 3D reconstruction / photomodeling Research aims The conservation of heritage buildings relies on diagnosis on current status and restoration interventions. Therefore, it is based on various kinds of investigations and analytical data. For that reason, the amount of heterogeneous data collected on heritage buildings (concerning historicalartistic documentation and technical and scientific records), should be relied in order to extract and display significant information. For this reason, the aim of this research is to define a new tool, belonging to a web-based documentation 3D platform, for the mapping and display of stone alterations on cultural sites. This tool could be used by different experts responsible for conservation (such as conservators, architects, scientists, curators, operators, analysts, consultants) and could support the stages of maintenance and monitoring that are preliminary to all restoration works.

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Section: Related Workmentioning

confidence: 99%

Developing a toolkit for mapping and displaying stone alteration on a web-based documentation platform

Stefani

Brunetaud

Janvier-Badosa

et al. 2014

Journal of Cultural Heritage

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“…In conservation practice, the identification of causes, location and progress of detachments is commonly based on subjective and empirical methods, such as the percussion approach [3][4][5] . The latter entails the gentle tapping of the painted surface with a finger or a suitable light weight instrument and the subsequent interpretation of the generated acoustic response 6,7 . Conflicting results can often emerge with this approach: this was observed during the condition assessment of the structure of two medieval wall paintings in the Mariakerk, Nisse, the Netherlands.…”

Section: Introductionmentioning

confidence: 99%

Application of shearography and the percussion method for the structural inspection of wall paintings: a case study of St. Christopher in Maria Church, Nisse

Gatto

Anisimov

Lettinga

et al. 2021

Optics for Arts, Architecture, and Archaeology VIII

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Structural delamination in mural paintings is a complex phenomenon and is considered among the most frequent types of damage. In conservation practice, the most common technique to identify structural detachments is the percussion method. Full-field optical techniques based on interferometry, such as shearography, can provide a more scientifically substantiated evaluation of the condition of heterogeneous structures of wall paintings. The empirical nature of the percussion method was observed during the condition assessment of two medieval wall paintings in the Mariakerk, Nisse, the Netherlands. It can be argued that, to allow the formulation of specific treatment needs for structural delamination in wall paintings, accurate defect mapping and characterisation is needed. The application of shearography was believed to provide a holistic representation of the condition of the structure of the wall painting depicting St. Christopher in the Mariakerk. Preliminary comparison of the methods involved revealed a degree of matching between results obtained. Discrepancies, i.e. areas deemed extremely vulnerable during percussion testing that were not detected by shearography, are debatably caused by the misinterpretation of the acoustic response during percussion testing or the inability of shearography to detect in depth structural defects. Further research regarding shearography should focus on providing more information about the depth of structurally delaminated areas within the heterogeneous layered structure of wall paintings.

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“…The effectiveness of holographic interferometry and speckle-based techniques for the analysis of artworks is well demonstrated, as reviewed in [ 8 , 9 , 10 , 11 , 12 , 13 ]. The applications include the structural evaluation of restoration processes (such as consolidation, cleaning or protective treatments), the detection of alterations induced by aging (such as cracks or subsurface defects) and the real-time monitoring of deformation due to microclimate variations [ 14 , 15 , 16 , 17 ]. As the nature of many artifacts makes their transport to a dedicated facility not possible, many research efforts are addressing the problem of in situ diagnostics with portable speckle-based techniques [ 14 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…Speckle metrology, in short, allows measuring the object deformations by acquiring and analyzing a sequence of speckle patterns. The ESPI technique is based on a two-beam configuration similar to holographic interferometry (as such, it is highly sensitive, up to sub-micron scale) and has found advantageous applications in the conservation field [ 8 , 13 , 15 , 28 , 29 , 30 ]. The SPP technique, conversely, is performed without the reference beam, by acquiring the speckle intensity pattern generated by the object beam alone.…”

Section: Introductionmentioning

confidence: 99%

A Portable Compact System for Laser Speckle Correlation Imaging of Artworks Using Projected Speckle Pattern

Daffara

Marini

2020

J. Imaging

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Artworks have a layered structure subjected to alterations caused by various factors. The monitoring of defects at sub-millimeter scale may be performed by laser interferometric techniques. The aim of this work was to develop a compact system to perform laser speckle imaging in situ for effective mapping of subsurface defects in paintings. The device was designed to be versatile with the possibility of optimizing the performance by easy parameters adjustment. The system exploits a laser speckle pattern generated through an optical diffuser and projected onto the artworks and image correlation techniques for the analysis of the speckle intensity pattern. A protocol for the optimal measurement was suggested, based on calibration curves for tuning the mean speckle size in the acquired intensity pattern. The system was validated in the analysis of detachments in an ancient painting model using a short pulse thermal stimulus to induce a surface deformation field and standard decorrelation algorithms for speckle pattern matching. The device is equipped with a compact thermal camera for preventing any overheating effects during the phase of the stimulus. The developed system represents a valuable nondestructive tool for artwork diagnostics, allowing the monitoring of subsurface defects in paintings in out-of-laboratory environment.

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Monitoring detaching murals in the Convent of Müstair (Switzerland) by optical metrology

Cited by 25 publications

References 9 publications

Developing a toolkit for mapping and displaying stone alteration on a web-based documentation platform

Developing a toolkit for mapping and displaying stone alteration on a web-based documentation platform

Application of shearography and the percussion method for the structural inspection of wall paintings: a case study of St. Christopher in Maria Church, Nisse

A Portable Compact System for Laser Speckle Correlation Imaging of Artworks Using Projected Speckle Pattern

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