volume | PIER Journals

Abstract

In this paper, a one-dimensional numerical framework based on Finite-Difference Time-Domain (FDTD) method is developed to model response behaviour of Ground penetrating radar (GPR). The effects of electrical properties such as dielectric constant, conductivity of the media have been evaluated. A Gaussian shaped pulse is used as source which propagates through the 1D array grid, and the pulse interactions at different media interfaces have been investigated. The objective of this paper is to assess the modelling criteria and success rate of detecting buried object using the framework. A real life application of GPR to detect a buried steel bar in one meter thick concrete block has been carried out, and the results present successful detection of the steel bar along with measured depth of the concrete cover. The developed framework could be implemented to model multi-layer dielectric blocks with detection capability of various buried objects.

1. Ji, G., X. Gao, H. Zhang, and T. Gulliver, "Subsurface object detection using UWB ground penetrating radar," IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, Victoria, Canada, 2009. Google Scholar

2. Irving, J. and R. Knight, "Numerical modeling of ground-penetrating radar in 2-D using MATLAB," Journal of Computers & Geosicences, Vol. 33, 1247-1258, 2006.
doi:10.1016/j.cageo.2005.11.006 Google Scholar

3. Colla, C., D. McCann, and M. Forde, "Radar testing of a masonry composite structure with sand and water backfill," Journal of Bridge Engineering, Vol. 6, No. 4, 262-270, 2001.
doi:10.1061/(ASCE)1084-0702(2001)6:4(262) Google Scholar

4. Diamanti, N., A. Giannopoulos, and M. C. Forde, "Numerical modelling and experimental verification of GPR to investigate ring separation in brick masonry arch bridges," NDT & E International, Vol. 41, No. 5, 354-363, 2008.
doi:10.1016/j.ndteint.2008.01.006 Google Scholar

5. Bergmann, T. and K. Holliger, "Numerical modeling of borehole georadar data," Journal of Geophysics, Vol. 67, No. 4, 1249-1257, 2002.
doi:10.1190/1.1500387 Google Scholar

6. Benedetto, A., "Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain," Journal of Applied Geophysics, Vol. 71, No. 1, 26-35, 2010.
doi:10.1016/j.jappgeo.2010.03.001 Google Scholar

7. Balanis, C., Antenna Theory: Analysis and Design, John Wiley and Sons, Inc., 2005.

8. Jin, J., The Finite Element Method in Electromagnetics, 2nd Ed., Wiley-IEEE Press, 2002.

9. Seyfi, L. and E. Yaldz, "A simulator based on energy-efficient GPR algorithm modified for the scanning of all types of regions," Turkish Journal of Electrical Engineering and Computer Sciences, Vol. 20, No. 3, 381-389, 2010. Google Scholar

10. Giannopoulos, A., "Modelling ground penetrating radar by GprMax," Journal of Construction and Building Materials, Vol. 19, 755-762, 2005.
doi:10.1016/j.conbuildmat.2005.06.007 Google Scholar

11. Perez-Gracia, V., D. Capua, R. Gonzalez-Drig, and L. Pujades, "Laboratory characterization of a GPR antenna for high-resolution testing: Radiation pattern and vertical resolution," NDT & E International, Vol. 42, 336-344, 2009.
doi:10.1016/j.ndteint.2008.12.007 Google Scholar

12. Malhotra, V. and N. Carino, Nondestructive Testing of Concrete, CRC Press, 2004.

13. Baker, G., S. Jordon, and J. T. Pardy, "An Introduction to ground penetrating radar (GPR)," The Geological Society of America (Special Paper), Vol. 432, No. 2, 2007. Google Scholar

14. Binda, L., A. Saisi, C. Tiraboschi, S. Valle, C. Colla, and M. Forde, "Application of sonic and radar tests on the piers and walls of the Cathedral of Noto," Journal of Construction and Building Materials, Vol. 17, No. 8, 613-627, 2003.
doi:10.1016/S0950-0618(03)00056-4 Google Scholar

15. Sullivan, D. M., Electromagnetic Simulation Using the FDTD Method, John Wiley & Sons, 2013.
doi:10.1002/9781118646700

Mr. Md Omar Faruq Howlader

Dr. Tariq Pervez Sattar