Depth of first detectable defect in a masonry wall using FPR

S. Colombo; Antonios Giannopoulos; Mike C. Forde

doi:10.1117/12.462216

12 April 2002 Depth of first detectable defect in a masonry wall using GPR

S. Colombo; Antonios Giannopoulos; Mike C. Forde;

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Proceedings Volume 4758, Ninth International Conference on Ground Penetrating Radar; (2002) https://doi.org/10.1117/12.462216
Event: Ninth International Conference on Ground Penetrating Radar (GPR2002), 2002, Santa Barbara, CA, United States

Abstract

This paper focuses on the accuracy of detection of the first defect from a ground penetrating radar (GPR) signal in a masonry wall. The main conclusions are drawn from a carefully executed piece of experimental research work based upon field work on a masonry wall on the Bell Tower at Cremona. From inspection of the field GPR records, the resolution of detection of the first target or defect was found to be related to the length of the first reflection from the surface of the masonry. Thus conventional geophysics guidelines with respect to target detection related to one-tenth of a wavelength were tested against field observations and found to be inapplicable in relation to the detectability of the first defect. The shallowest detectable target proved to be at a depth of one-third the centre frequency of the antenna.

Citation Download Citation

S. Colombo, Antonios Giannopoulos, Mike C. Forde, "Depth of first detectable defect in a masonry wall using GPR", Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); doi: 10.1117/12.462216; https://doi.org/10.1117/12.462216

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