Share Email Print
cover

Proceedings Paper

Electromagnetic modeling for ground-penetrating imaging radar (GPIR) using 3-D finite difference time-domain (FDTD) modeling codes
Author(s): Scott D. Nelson
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

An analysis of the one-, two-, and three-dimensional electrical characteristics of structural cement and concrete is presented. This work connects experimental efforts in characterizing cement and concrete in the frequency and time domains with the Finite Difference Time Domain (FDTD) modeling efforts of these substances. These efforts include electromagnetic (EM) modeling of simple lossless homogeneous materials with aggregate and targets and the modeling dispersive and lossy materials with aggregate and complex target geometries for Ground Penetrating Imaging Radar (GPIR). Two- and three-dimensional FDTD codes (developed at LLNL) were used for the modeling efforts. The purpose of the experimental and modeling efforts is to gain knowledge about the electrical properties of concrete typically used in the construction industry for bridges and other load bearing structures. The goal is to optimize the performance of a high-sample-rate impulse radar and data acquisition system and to design an antenna system to match the characteristics of this material. Results show agreement to within 2 dB of the amplitudes of the experimental and modeled data while the frequency peaks correlate to within 10% -- the differences being due to the unknown exact nature of the aggregate placement.

Paper Details

Date Published: 14 September 1994
PDF: 10 pages
Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); doi: 10.1117/12.186715
Show Author Affiliations
Scott D. Nelson, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 2275:
Advanced Microwave and Millimeter-Wave Detectors
Satish S. Udpa; Hsiu C. Han, Editor(s)

© SPIE. Terms of Use
Back to Top