Raffaele Persico, Andrea Cataldo, Egidio De Benedetto
In this contribution we describe new possibilities regarding TDR measurements, related to the measurement of the electromagnetic characteristics of lossy and possibly magnetic and dispersive materials. The proposed advancement is related to the introduction of a spatial diversity in TDR measurements, achievable by means of extensible probes or alternatively by means of arrays of probes. The spatial diversity can replace the frequency diversity increasing the information achievable at single frequency, so allowing measurements immune from the effects of a possibly unknown dispersion law....
TC4 MetroArchaeo 2017
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Lara Pajewski, Raffaele Persico, Marco Salucci, Mercedes Solla
This contribution aims to offer an overview on the most interesting activities fulfilled by Members of the COST (European Cooperation in Science and Technology) Action TU1208 "Civil Engineering Applications of Ground-Penetrating Radar," concerning the use of ground-penetrating radar (GPR) and complementary non-destructive testing (NDT) techniques in archaeology and for cultural-heritage diagnostics. In most cases, archaeology exploits the great potential offered by the GPR technique in limited areas and without complementing it with other NDT approaches, whereas the combined application of...
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Efstratia Chatzi, Stamatis Chatzistamatis, Nikolaos Soulakellis, Nikolaos Zouros, Christos-Nikolaos Anagnostopoulos
In this paper, a methodology for the photogrammetric and laser scan survey of tree fossils of the Petrified Forest on Lesvos island in Greece, is proposed.The Petrified Forest is of particular interest since it is one of the rarest monuments of geological heritage worldwide and it was formed from the fossilized remains of plants. During this study, photogrammetric and laser scanning data by the tree fossils have been gathered, processed and modelled in 3D, and a comparison of the two techniques is taking place. Finally, the most suitable technique for the 3D modelling of objects such as the...
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Stefan Spelitz
We present an algorithm for reconstructing the inner geometry of polygonal models with one or more openings (e.g. vessels). Known inner surface parts act as constraints to be fulfilled as part of the resulting solution. The calculation is done in an iterative fashion in order to minimize the difference between expected and achieved object volume. The output is a closed manifold polygonal mesh suitable for calculating properties like its volumetric capacity or for manufacturing (e.g. 3D printing). The algorithm has been applied to 111 antique vessels to allow a comparative study of their...
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Di Angelo L., Di Stefano P., Morabito A.E., Pane C.
This paper gives a contribution to the automatic recognition of significant features of ancient ceramics, useful for the historical and/or archeological investigation. These very common type geometric features are obtained by a sweeping action that leaves negative or positive traces, characterized by a cross section with one or more constant radii. The paper proposes a novel methodology that, analyzing the principal curvatures at the points of high-density geometric models of ceramic vessels, acquired by laser scanning, identifies the nodes potentially attributable to these features of...
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Juraj Sarkisjan, Martin Kampel
Small cultural heritage institutions are facing growing problem of the rising amount of unprocessed bulk finds in their depositories. Primary focus of this paper was put on the analysis of the low-cost 3D scanner and on the investigation whether this device might be considered a suitable tool for archaeologists who need to accelerate their task. Secondary aim was to confirm whether all the advantages the high end 3D scanner has to offer are indispensable for the extraction of basic data from the bulk finds. Advantages and disadvantages of both 3D scanners were then analyzed and compared in...
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Di Angelo L, Di Stefano P, Pane C
The study of the immense patrimony of ceramic finds is still performed by the traditional manual archaeological approach. So that, the information of the shape and dimensions of the sherds have high uncertainties, are expensive and time consuming to be obtained. With the aim to overcome these limitations, for several years our research group has directed efforts to the development of an automatic computer-based method for the morphological and dimensional characterization of axially-symmetric shards. In this paper, the salient points of this method are reported, as well as the management...
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P. Castellini, M. Martarelli, S. Lenci, E. Quagliarini, Michele Silani, Alberta Martellone
This paper shows the first results of a diagnostic survey of the fresco paintings in two domus of the Region V in Pompeii, the Domus of C. Iulius Polybius and the Domus of Casti Amanti, which stand out for archaeological relevance and decorative asset. Especially, these cases of study were selected because pose special challenges for damage detection and conservation, due to the presence of large parts of not excavated soil behind walls and frescoes painting surfaces. The survey has been realized within the framework of "The Great Pompei Project" that aims to enhance the effectiveness of the...
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Lorenzo Jurina, Edoardo Oliviero Radaelli, Andrea Antonio Bassoli
In the last decades, professionals and researchers have made a strong effort to understand resisting and collapse mechanisms in masonry buildings, trying to evaluate the safety factor, especially in presence of horizontal seismic loads. Therefore, innovative techniques based on dynamic response have been developed, to calibrate structural Finite Element Models. The present paper contains some study cases were dynamic test were performed to calibrate numerical models in the seismic analysis of historic masonry buildings.
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A. D'Antuono, M. Martarelli, P. Castellini
Active thermography is a Non Destructive Technique (NDT) for composite materials testing, largely applied in aeronautics applications. Some previous works have also demonstrated its power for damage detection in frescoes and paintings. Active thermography is based on the measurement of the 2D thermal emission of an object surface when the object is exposed to a thermal flux. The thermal flux propagation inside the object affects its surface temperature and emissivity, which can be measured by an Infra-Red (IR) thermal camera. The presence of defects inside the object, as detachment between...
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