Abstract
In this paper, we propose the combination of different migration results achieved on the same data in order to account for different values of the propagation velocities of the electromagnetic waves within the considered Ground Penetrating Radar (GPR) profile. These different values can be the result of a variable lithological composition or (more probably for short Bscans) the results of different moisture levels, or both. Here, we separately consider the two cases of horizontal or vertical variability of the propagation velocity with a transition zone between two zones with constant propagation velocity. Moreover, we also propose a time-depth conversion accounting for these different values of the propagation velocity along the considered GPR Bscan. The method is applied to real data gathered in the field with regard to a concrete coverage containing liner layers.
Highlights
The analysis of concrete layers is a classical Ground Penetrating Radar (GPR) application where, in particular, reinforcement rebars are looked for and the status of the concrete is of interest for maintenance purposes and analyses of possible damages or even possible dangerous situations [1–3]
In this paper, we propose the combination of different migration results achieved on the same data in order to account for different values of the propagation velocities of the electromagnetic waves within the considered Ground Penetrating Radar (GPR) profile
The diffraction hyperbolas can provide direct information about the dielectric permittivity of the propagation medium crossed by the electromagnetic waves; they can provide qualitative information about the losses in the concrete if some hyperbolas appear weaker than the others at parity of time depth
Summary
The analysis of concrete layers is a classical GPR application where, in particular, reinforcement rebars are looked for and the status of the concrete (moisture, moisture gradient, fractures, salt content) is of interest for maintenance purposes and analyses of possible damages or even possible dangerous situations [1–3]. The diffraction hyperbolas can provide direct information about the dielectric permittivity of the propagation medium crossed by the electromagnetic waves; they can provide qualitative information about the losses in the concrete if some hyperbolas appear weaker than the others at parity of time depth These information elements have to be managed carefully, because there are several causes that might generate weaker or stronger reflections from the bars, including their own state and possibly some processing step, e.g., the background removal [8]. When visualizing the data in abscissa and return time, especially for an inexpert user, these discrepancies might provide a first impression stronger than in reality We will show this in relationship in the analysis of some GPR profiles gathered in a square with a reinforced concrete pavement ( presenting liner-separated layers at some points), prospected by the company Geostudi Astier Ltd. with a 3 GHz antenna.
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