Non-destructive Analysis of Material Detachments from Polychromatically Glazed Terracotta Artwork by THz Time-of-Flight Spectroscopy

The damage caused by the environment to exposed glazed terracotta objects is usually not externally visible. For instance, the detachment of the glaze owing to subsurface crack formation or whole cavities in the area of the terracotta cannot be located visually. In this article, we demonstrate that...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2017-04, Vol.38 (4), p.495-502
Main Authors: Krügener, Kirsti, Busch, Stefan F., Soltani, Amin, Castro-Camus, Enrique, Koch, Martin, Viöl, Wolfgang
Format: Article
Language:English
Subjects:
Air gaps
Classical Electrodynamics
Electrical Engineering
Electronics and Microelectronics
Engineering
Instrumentation
Nondestructive testing
Restoration
Spectrum analysis
Terracotta
Tomography
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Summary:The damage caused by the environment to exposed glazed terracotta objects is usually not externally visible. For instance, the detachment of the glaze owing to subsurface crack formation or whole cavities in the area of the terracotta cannot be located visually. In this article, we demonstrate that terahertz time-of-flight spectroscopy is suitable to locate and measure the air gaps under the glaze detachments which could only be done by X-ray axial tomography before. This tool will be very useful to guide the restoration process, particularly for pieces that are still attached to buildings or other structures that cannot be transported to a tomography facility.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-016-0339-9