The following Figures have been obtained from the FDTD simulation of radargram traces of a metallic pipe buried 2m deep on a dipersive soil (Puerto Rico clay loam with 2.5, 5, and 10 % of moisture respectively). The FDTD simulation includes the dispersion effect through Debye models and use of the PLRC method. The computational domain is truncated using the PML absorbing boundary condition extended to match dispersive media. As the soil moisture is increased, the echo appears later and weaker.

Radargram trace of a metallic pipe with 2.5% moisture

Radargram trace of a metallic pipe with 5.0% moisture

Radargram trace of a metallic pipe with 10.% moisture

The next two Figures result from the FDTD simulations of pulse propagation in 2-D cylidrical and 3-D spherical grids, respectively. The cylindrical and spherical grids include 8-layers cylindrical and spherical PML. The insets show the same simulations without the use of the PML.

Pulse propagation in 2-D cylidrical grid

Pulse propagation in 3-D spherical grid

The above work is a collaboration between Fernando Teixeira and Prof. Weng Cho Chew. Please send suggestions, comments, and inquiries to: fteixeir@cspark.ece.uiuc.edu.