Combined holographic subsurface radar and infrared thermography for diagnosis of the conditions of historical structures and artworks
L. Capineri, P. Falorni, S. Ivashov, A. Zhuravlev, I. Vasiliev, V. Razevig, T. Bechtel and G. Stankiewicz
Journal name: Near Surface Geophysics
Issue: Vol 8, No 5, October 2010 pp. 355 - 364
Special topic: GPR in Archaeology
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This paper describes a new application of holographic radar for non-destructive testing applied to cultural heritage items. A holographic radar, called RASCAN, operates in continuous wave multi-frequency mode at 4 GHz range and produces images with high in-plane resolution (about 2 cm). Marble items and other stones have been investigated to validate the method to search for subtle cracks, moisture or to unveil details of structures at shallow depth (up to 2 wavelengths). Other important materials are aged wood items that are investigated for tunnels made by insects. Then the holographic radar imaging has been experimentally compared with infrared thermography to understand the advantages and disadvantages of these methods and to derive indications for solving the problem common in all geophysics of inherent non-uniqueness.