Abstract
Abstract. The paper presents results from applying Digital Image Correlation (DIC) technique to determine deformations and verify stability on a gantry during surveying operations on the Michelangelo’s David at the Galleria dell’Accademia di Firenze museum in Florence. An advanced hi-resolution Structured-light 3D scanner has been used to create a hi-detailed digital twin of the masterpiece. Considering the high scanner sensitivity, a contactless, remote and passive monitoring system of the gantry stability has been chosen to guarantee maximum freedom of movement around the David and avoid any interference during scanning operations. Due to the remarkable elevation of the statue, which reaches almost 7 meters on his pedestal, and considering the cramped operating area around the statue, an ad-hoc gantry has been designed and deployed. The sophisticated scanner’s technique and the extreme hi-resolution required for the survey needed firm gantry stability during scanning operations from one side. The complex geometries and the considerable extension of the statue surface impose extended flexibility and a nimble elevation platform from the other side. Thanks to the DIC technique the gantry stability has been constantly monitored with an accuracy of 0.03 ÷ 0,04 pixels, optimising scanning scheduling and, consequently, operations efficiency. A comparison of scans with post-processed deformation patterns allowed to optimise the scanning schedule, minimising downtime, and maintaining the needed platform stability threshold for effective scanning.
Highlights
Michelangelo Buonarroti’s David is one of the most famous masterpieces globally, and it is universally recognised as the Florentine Renaissance icon
Digital Image Correlation (DIC) analysis have been performed through the use of IRIS software, developed by Nhazca S.r.l. start-up Sapienza
The software allows for Change Detection (CD) and Digital Image Correlation (DIC) analysis by analysing the data acquired from different platforms and sensors
Summary
Michelangelo Buonarroti’s David is one of the most famous masterpieces globally, and it is universally recognised as the Florentine Renaissance icon Thanks to his significance and cultural heritage value, David has been chosen to represent Italy at the Expo 2020 Dubai. The development of accurate and cost affordable 3D surveying techniques and instruments has permitted in recent years to extend the use of the most cutting-edge technologies and methods to architectural, environmental and Cultural Heritage fields. In this particular case, the 3D survey has been performed Using a Structured-light 3D scanner from Hexagon Manufacturing Intelligence, the StereoScan neo (Hexagon Manufacturing Intelligence, 2020). Marc Levoy, carried out a scanning campaign of the statue with a resolution of 0,29 mm and a dynamic range of 20.000:1 (Levoy et al, 2000)
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