A Synthetic study of dispersive GPR data due to multilayer waveguides

DOI

10.2991/iceeg-16.2016.124How to use a DOI?

Keywords

GPR, dispersion, waveguide,leaky mode

Abstract

The electromagnetic waves emitted by ground-penetrating radar (GPR) can show apparent dispersion, when they are trapped in thin interlayers whose relative permittivities are large enough. Those thin layers can act as a waveguide. The velocities and thicknesses of the surface waveguide layers and the velocity of substrate layer determine the feature of dispersion. Leaky modes correspond to the complex roots of dispersion equation of the multilayer waveguide. Finite-difference time-domain method is employed to obtain the GPR data sets of two numerical models. Dispersion images of these models are acquired by phase shift method. Moreover, the theoretical dispersion curves of leaky modes and guided modes are calculated. The simulation results illustrate that the dispersion images of multilayer waveguides are more distorted than those of single layer waveguides. It is difficult to recognize separate modes. Consequently, the inversion result would be unreliable. Further researches are required to develop more reliable methods for solving dispersion equation and inversion.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yi Yu
AU  - Jianghai Xia
AU  - Feng Chen
PY  - 2016/06
DA  - 2016/06
TI  - A Synthetic study of dispersive GPR data due to multilayer waveguides
BT  - Proceedings of the 7th International Conference on Environment and Engineering Geophysics & Summit Forum of Chinese Academy of Engineering on Engineering Science and Technology
PB  - Atlantis Press
SP  - 456
EP  - 459
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceeg-16.2016.124
DO  - 10.2991/iceeg-16.2016.124
ID  - Yu2016/06
ER  -