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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:26 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Ground penetrating radar data interpretation using an electromagnetic wave propagation simulator
Authors:
Iulian-Alexandru CHELMUS
Affiliation:
National Institute for Research and Development in Optoelectronics-INOE 2000, Atomiștilor str. no.409, Măgurele City, Ilfov County, Romania
E-mail
alexandru.chelmus@inoe.ro
Keywords:
radargram, case study, archaeology
Abstract:
The ground penetrating radar (GPR) is a geophysical, non-invasive, method of investigating the ground by emitting and studying the propagation of electromagnetic pulses. The radiation used is from the microwave spectrum (UHF / VHF) which is reflected due to the discontinuity of dielectric materials, discontinuities that can represent buried objects / structures or stratigraphy differences. The amplitude of the reflected signal along with the duration of propagation are recorded by the equipment, which can be viewed in the form of images referred in the literature as radargrams. The possibility of buried material identification, regardless of their nature, makes this technique applicable in various fields, including archeology, complementing traditional prospecting techniques. As it happens in the case of using other investigation techniques, to develop a complete report three stages are required, respectively acquisition, processing and data interpretation. Data processing is done using dedicated software that provide filters and algorithms (removing DC component, background noise, or narrowing the frequency band) with the purpose of keeping only the information of interest from records. The interpretation is the most complex part, requiring knowledge about the: propagation of electromagnetic radiation, archaeology, soil proprieties, etc. In order for interpretations to be as accurate as possible, simulators for the propagation of electromagnetic radiation can be used, that allow the creation of complex shapes and physical properties environments (setting the relative dielectric permittivity, resistivity, magnetic permeability), but also choosing an antenna with the frequency equal to that used in situ investigations. By comparing the simulation results with the radargrams can be: improved the data interpretation, minimized the errors and even predict how buried remains in archaeological sites are shown on records. In the paper will also be presented simulations of radargrams obtained from GPR surveys carried out in Romania, compared with the real data.
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