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Development of a Low-Cost Airborne Ultrasound Sensor for the Detection of Brick Joints behind a Wall Painting

Author(s): Fernando-Juan García-Diego | José María Bravo | Juan Pérez-Miralles | Héctor Estrada | Angel Fernández-Navajas

Journal: Sensors
ISSN 1424-8220

Volume: 12;
Issue: 2;
Start page: 1299;
Date: 2012;
Original page

Keywords: non destructive test | ultrasound | wall painting | brick joints

Non-destructive methods are of great interest for the analysis of cultural heritage. Among the different possible techniques, this paper presents a low cost prototype based on the emission and reception of airborne ultrasound without direct contact with the test specimen. We successfully performed a method test for the detection of brick joints under a XVth century Renaissance fresco of the Metropolitan Cathedral of the city of Valencia (Spain). Both laboratory and in situ results are in agreement. Using this prototype system, an early moisture detection system has been installed in the dome that supports the fresco. The result is encouraging and opens interesting prospects for future research.
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