PROJECT TITLE :
Generalization of PILE Method to the EM Scattering From Stratified Subsurface With Rough Interlayers: Application to the Detection of Debondings Within Pavement Structure
This paper presents the numerical technique, generalized propagation-within-layer growth (GPILE), to calculate the scattered electromagnetic field by any stratified 1-D medium composed of three random rough interfaces separating homogeneous media. GPILE may be a generalization of the propagation-within-layer enlargement technique, that considers solely two interfaces. Each ways rely on the rigorous implementation of the Maxwell equations, with a easy matrix formulation and that have a simple physical interpretation. In explicit, this technique permits us to tell apart the primary echo of the upper surface and conjointly the multiple echoes arising from the intermediate and lower interfaces. This method is applied in this paper to simulate the ground-penetrating radar (GPR) signal at nadir. The simulated signals are analyzed to study the sensitivity of the GPR signal to any material debonding at intervals the pavement layered structure.
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