Underground Cavity Detection Using Cross-Borehole Ground-Penetrating Radar | Caleb Leibowitz
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https://tau-ac-il.zoom.us/j/86067718025?pwd=RlJBaGpQR004cWx6dWxKaHVzdkE0dz09
Meeting ID: 860 6771 8025
Passcode: 219983
Electrical Engineering Systems ZOOM Seminar
Speaker: Caleb Leibowitz
Ph.D. student under the supervision of Prof. Anthony Weiss
Wednesday, 27th December 2023, at 13:00
Underground Cavity Detection Using Cross-Borehole Ground-Penetrating Radar
Abstract
We study the use of cross-borehole ground-penetrating radar (GPR) to detect underground cavities. Cross-borehole GPR has been shown to perform very well on the cavity-detection problem, but in many circumstances existing techniques are incapable of achieving satisfactory results. In particular, these circumstances often include measurements in stratified soils, where the effect on the wave of propagation through an anomalous stratum can be confused with the effect on the wave of propagation through a cavity.
We develop a model of the propagation of the GPR signal through soil which contains a cavity. Using this model, we predict the effect of propagation through a cavity on both the magnitude spectrum of the measured signal and on the group dispersion observed. We validate this model, at least as it concerns the prediction of the magnitude spectrum and of group dispersion. We then provide methods to use these features of the received signal to detect underground cavities with high probability. We further show that these methods are robust to factors, such as borehole drift or certain anomalous strata, which render conventional cavity-detection methods unworkable.
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