Large-scale investigation of plaster detachments in historical murals by acoustic stimulation and video-holographic detection

Guelker, Gerd; Hinsch, Klaus D.; Joost, Holger

doi:10.1117/12.445661

Cited by 6 publications

(5 citation statements)

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“…Structural delamination, detachments or defects are terms used to refer to an ongoing degradation process that generates the loss of adhesion and cohesion of heterogeneous layers in the structure of wall paintings and architectural surfaces 1,2 . This complex type of damage is often encountered in conservation practice, however, its identification relies on empiric approaches, such as the percussion method [3][4][5] . The latter is based on the documentation of the acoustic response generated by the tapping of the pictorial surface of the architectural element and it can lead to confusing results, due to its poor repeatability and subjectivity.…”

Section: Discussionmentioning

confidence: 99%

“…Whilst this method appears to be an extremely common approach for the identification of detachments in wall paintings, only a few publications describe it in a meaningful way 3,7,9 with many others simply mentioning it 4,[10][11][12][13] and potentially, believing it to refer to a standardized method. Ultimately, the quality of the interpretations and the results directly corresponds to the experience of the conservator.…”

Section: Percussion Methodsmentioning

confidence: 99%

“…Delamination, detachments or structural defects are terms implemented to indicate the presence of a structural decaying process that is gradually causing the loss of adhesion and cohesion of heterogeneous layers in the structure of wall paintings, resulting in the partial separation between plaster layers, pictorial layers and their support 1,2 . 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 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Percussion Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…In response to these needs, we set up the "acoustic software and applications" course [2]. The course aims to let students master solid acoustic simulation theory, be able to skillfully apply acoustic simulation software to deal with problems, and be able to utilize the software to carry out innovative design as the teaching goal.…”

Section: Introductionmentioning

confidence: 99%

Reform and Practice on the Acoustics Simulation Education

Wang,

Zeng,

Lei

et al. 2024

Proceedings of the 3rd International Conference on Internet Technology and Educational Informatization, ITEI 2023, November 24–

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Existing acoustic simulation courses are mostly heavy on software, light on theory and the practical teaching method is outdated, which leads to the students' single ability to solve complex problems, single problem solving idea, insufficient innovative application ability and other problems. In view of these problems, this course actively carries out teaching innovation, from the content system, the teaching form of two dimensions of innovation to realize the students to master solid acoustic simulation theory, skilled application of acoustic simulation software to deal with the problem, and the ability to use the software to carry out innovative design as the teaching objectives. In terms of content system, this course is centered on the core key point of acoustic simulation -applicable frequency band, respectively, for low-frequency, medium and high-frequency simulation, the establishment of fluctuating acoustics and geometric acoustics, statistical energy analysis of the combination of the content system, through the consolidation of theoretical knowledge, enables students to understand the principles of the corresponding software, and has the ability to expand the complexity of the problem. In the form of teaching, instead of focusing on the explanation of software operation in the classroom, the video of software explanation and real case explanation are carried out before, during and after the classroom, so as to realize the studentcentered practice in each section, thus improving the students' ability to solve problems with diversified ideas and innovative applications, and finally realizing the innovative goal of "strong foundation, heavy practice and innovation", The ultimate goal is to realize the innovative goal of "strengthening foundation, emphasizing practice and seeking innovation".

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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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Large-scale investigation of plaster detachments in historical murals by acoustic stimulation and video-holographic detection

Cited by 6 publications

References 0 publications

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

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

Reform and Practice on the Acoustics Simulation Education

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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