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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:21 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Analysis of radio wave propagation in soil with applications in archeology
Authors:
A. CHELMUS, D.ENE, L.ANGHELUTA
Affiliation:
National R&D Institute for Optoelectronics – INOE 2000
E-mail
GPR, wave propagation, soil investigation, roman site investigation
Keywords:
GPR, wave propagation, soil investigation, roman site investigation
Abstract:
This paper presents how the propagation of electromagnetic wave is influenced by the relative permittivity of the propagation medium, in our case the soil, and by the central frequency of the transmitter antenna. The paper is divided in two parts. First part is a theoretical one (containing simulations and propagation characteristics of electromagnetic radiation according to the factors mentioned above, obtained by using calculation formulas). The second part contains the results of a GPR survey on an archaeological site from Malaiesti, Prahova County. This is a site of national importance, registered in the Historical Monuments list of 2010 and in the National Archaeological Record. The site has two interest areas: the fort and the roman baths, dating from 101-117 AD. Construction was done by roman soldiers in the conquest campaigns of emperor Traian, campaigns that led to the conquest of the Dacian kingdom. Ground penetrating radar (GPR) is a non-invasive geophysical method for soil investigation based on studying the mode and duration of electromagnetic pulses propagation. The equipment uses radiation from the microwave spectrum (UHF / VHF); broadcasted signal is reflected due to the dielectric material discontinuities. Measurements were taken in five areas of interest. Four areas were investigated using an atenna with a center frequency of 800 MHz, and one with multiple center frequencies, respectively 250, 500 and 800 MHz, in order to observe how the depth of penetration and the spatial resolution is influenced by this antenna specific. Investigations’ results revealed not only the influence of the environment’s characteristics and the antenna‘s frequency on radio wave propagation, but also the detection on radargram of some buried objects and structures in the ground at depths of about 0.8 meters.
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