On GPR signal polarity reversal

Campo, Davide

doi:10.1109/iwagpr50767.2021.9843176

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…This method is very well known for its simplicity, robustness, and ability to recreate electrically and geometrically complex environments. Several studies on FDTD GPR applications are documented in the literature, such as: investigations on the GPR ability to identify defects in masonry structures (Diamanti et al, 2008;Hamrouche et al, 2009); applications on precast concrete units (Campo, 2019a); signal analysis and signal artefacts (Campo, 2019b(Campo, , 2021Diamanti & Annan, 2020;Diamanti et al, 2022); assessment on historical buildings (Solla et al, 2011a(Solla et al, , 2011b(Solla et al, , 2012; modelling commercial antennas (Patsia et al, 2021a;Warren & Giannopoulos, 2008; machine learning and full waveform inversion applications (Giannakis et al, 2021;Patsia et al, 2021b).…”

Section: Numerical Modelling Overviewmentioning

confidence: 99%

High‐frequency wide‐angle reflection and refraction method for structural engineering ground‐penetrating radar surveys

Campo

2023

Near Surface Geophysics

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Electromagnetic wave velocity in ground‐penetrating radar (GPR) constant offset data can be estimated via the diffraction hyperbola fitting method. This method is applicable when radargrams contain diffraction events (hyperbolic patterns) caused by scatters in the host smaller or equal to the dominant wavelength. An alternative method for velocity estimation, if no intrusive information is available for a direct correlation, requires the collection of multi‐offset data. The method is quite common for broad geophysical applications; however, it seems not to be fully utilized for engineering applications, such as slabs/walls where thickness estimation and depth of the embedded features are critical requirements for structural assessments. This method would also overcome the limitations in velocity calibration in environments with no hyperbolic signal signatures. The aim of this study is to explore multi‐offset high‐frequency GPR applications, specifically the wide‐angle reflection and refraction method, for structural engineering, to understand whether it is feasible, possible limitations, and advantages. Numerical models reproducing reinforced concrete elements and a cavity wall were analysed to understand the wave behaviour and predict the response prior to testing on real cases. The main purpose is to explore how reinforcing bars can affect the velocity spectra derived from semblance analysis and what the response would be in a case of multi‐layered structure with increasing velocity with depth (cavity wall). The comparison with real cases showed that, despite some intrinsic limitations, high‐frequency multi‐offset approach could be part of standard workflow for all those surveys where no other velocity estimation method is feasible.

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Section: Numerical Modelling Overviewmentioning

confidence: 99%

High‐frequency wide‐angle reflection and refraction method for structural engineering ground‐penetrating radar surveys

Campo

2023

Near Surface Geophysics

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“…To assess the void's material content, the polarity (change) and amplitude of the A-scan at the apex of the void's hyperbola can be analyzed Campo [163]. However, analysing the true amplitude of a signal convolved with noise and multiple reflections is a cumbersome task, and topic of many ongoing studies.…”

Section: Void Materialsmentioning

confidence: 99%