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The boundary between the unsaturated and saturated zones is commonly not characterized by a sharp interface, but rather by a gradual increase of water content. The shape of this capillary transition zone (CTZ) depends on the pore-size distribution of the soil and has a strong influence on the signature of GPR reflections. This can be observed when mapping groundwater tables with GPR: high frequencies...
Simulation of electromagnetic wave propagation in lossy and dispersive media requires a realistic description of the electrical and dielectric media parameters. We measured the complex dielectric permittivity of fine sand and silty clay in the GPR frequency range using the coaxial transmission line technique. We inverted the data with single- and multi-pole Debye models and a constant dc conductivity...
Our objective is the development of a prognosis system that predicts the soil-dependent GPR performance in landmine and improvised explosive device (IED) contaminated areas. One of the soil properties influencing sensing depth and image resolution of GPR is intrinsic attenuation. We investigated the frequency-dependent electromagnetic properties of a broad range of soil samples. In order to derive...
Electromagnetic induction (EMI)‐based metal detectors are the most widely used sensing techniques in landmine clearance operations; however, they are negatively influenced by frequency dependence of magnetic susceptibility. A total of 466 rock and soil samples collected from across the tropics are investigated in this study. The data show that frequency‐dependent susceptibility depends on the parent...
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