Discussão do conceito de Skin Depth e estimativa de parâmetros elétricos considerando os efeitos de polarização envolvidos a partir de medidas com GPR
Carlos A. Dias, Marcos V. Barbosa M., Flavia M. R. Patricio, Diego R. Borçoi and Bruno C. Moreira e Marco A. R. Ceia
Event name: 9th International Congress of the Brazilian Geophysical Society
Session: GPR - Ground Penetrating Radar
Publication date: 11 September 2005
Info: Extended abstract, PDF ( 1.22Mb )
The authors analyze, in this work, the polemic question of the signal, being measured by GPR, coming from depth greater than the plane wave skin depth. They conclude that signals are being measured, reflected from depths of the order of five times the skin depth for the 100 MHz frequency being used. They also estimate the dielectric constant for the mapped geologic formations using GPR.
More realistic values of K are obtained, for considering: a) the squared index of refraction, (c/v)2, as due to the electronic polarization, associated to the rock matrix, KM; b) the orientational polarization for the saline water, equal to 78, being considered for the water saturated pore spaces of the rocks, Kf. The mixed relation for a two components material was then used for the finalestimation.