Feature sponsored by Test & measurement
strains in a material over the entire surface. They therefore show whether and how the tapestry has deformed as a whole. Deformation maps, on the other hand, provide information about the local deformations in a material. They provide S-MA- CH staff with information on whether and how the tapestry has deformed at specific points. The full-field strain maps are processed together with the environmental variation findings to understand the hygromechanical behaviour of the Bayeux Tapestry. Hygromechanical behaviour refers to the interplay between moisture and the mechanical properties of the textile. This can be influenced by a number of factors, including the type of yarn used to make the fabric and the type of weaving or embroidery technique used to make the tapestry, which adds to the complexity of the study.
In order to incorporate scientific data into the decision-making process, tests were carried out on both facsimiles and the tapestry itself. On the facsimiles, the full-field strain maps were combined with the stress results from the force sensor measurement and the climate measurements (temperature and humidity). The results allow conclusions to be drawn about the climate regulation for optimal storage of the artefact. The data collected by the sensors and camera system was documented in real time to analyse long-term trends. With the help of the information provided, it can be ensured that the climatic conditions in the Bayeux Museum are within the optimal limits to avoid damage to sensitive art objects or historical exhibits, such as the Bayeux Tapestry.
OUTLOOK
The market for the protection and preservation of cultural heritage is slowly opening up to structural diagnostic procedures. “Our goal is to develop appropriate systems for conservators in a plug-and-play system,” explains Gauvin. In addition, the French start- up wants to use vision systems to monitor structural damage to paintings in museum galleries and historical monuments in the future. This approach across disciplines makes
it possible to assess the condition of exhibits so comprehensively that the appropriate conservation measures can be taken. “Our knowledge of mechanical engineering, combined with industrial image processing, opens up new approaches, expands the range of actions and produces innovative solutions.” An elaboration of the conservation conditions for handling, storage or presentation of artefacts based on these interdisciplinary research results offers protection against further damage. Historical as well as modern products of textile art can thus be preserved in the best possible way for the future. Image processing components make a valuable contribution to this.
Image credit: S-MA-C-H 26
IDS Imaging Development Systems
en.ids-imaging.com
May 2023 Instrumentation Monthly
A calibration plate is used to calculate the 2D position of the camera in relation to the object and to correct any kind of distortion caused by the camera and lens.
IDS camera point of view for 2D strain analysis
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