Polarization and acquisition in GPR surveys: tests on physical models

Capizzi, Patrizia; Cosentino, Pietro; Romano, Lia

doi:10.3997/2214-4609.201414520

Cited by 1 publication

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“…Numerous studies have been carried out on the subject of GPR reflection by cylindrical targets of various kinds and sizes (Ruck et al ; Radzevicius and Daniels ; Radzevicius et al ; Soon et al ). The polarization and orientation of a transmitting antenna are very important when you want to ensure that the energy scattered by buried targets is sufficient enough to be measured by the receiving antenna (Capizzi et al ). The amplitude of the reflected waves is a function of the angle between the cylinder and the dipole orientation.…”

Section: Study Of Reflection Given Off By Cylindrical Targetsmentioning

confidence: 99%

“…Consequently, it is a good idea to preliminarily determine the main direction of the buried target. Therefore, an algorithm based on Alford’s rotation operator (Alford ) for multi‐component GPR data analysis should be used (Capizzi et al ). The amplitudes and travelling times of the signals given off by azimuthal targets are dependent on the orientation of the transmitting and receiving antennas in respect of the anisotropy axis.…”

Section: Estimation Of the Strike Of Buried Structuresmentioning

confidence: 99%

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GPR multi‐component data analysis

Capizzi

Cosentino

2007

Near Surface Geophysics

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In order to test the capabilities of ground‐penetrating radar (GPR) detection, models were reproduced in a laboratory using both plastic and metal cylinders as well as sheets to represent anomalies buried in a plastic tank containing sand. These models, which represent pipes and dipping layers in a homogeneous medium (i.e., sand), were used to detect the object’s position and study its polarization properties based on the different dielectric contrasts between the object and the surrounding medium. We paid particular attention to the choice of medium through which the wavefield propagated, to be sure of its isotropy and homogeneity, in order for the velocity to be the same for every path travelled. Experimental tests were carried out by changing the dielectric contrasts from the target to the surrounding medium. In particular, the dielectric cylinders (which have a lower permittivity than that of the surrounding sand) were filled with different substances to represent targets such as PVC pipes, either empty or filled with hydrocarbons or water. The resulting scattered field depended on the electrical properties of both the cylinder and the surrounding material, the distance from the cylinder and the scattering angle. Further experimental tests were carried out by using multi‐component GPR data to study the possibility of calculating the angle between the direction of the profile and that of the anomalies. The experimental data obtained as responses to the physical models proved that this method can be successfully applied to detect the orientation of dipping layers, cylinders and vertical fractures.

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Section: Study Of Reflection Given Off By Cylindrical Targetsmentioning

confidence: 99%

Section: Estimation Of the Strike Of Buried Structuresmentioning

confidence: 99%