“Unlocking” the Ground: Increasing the Detectability of Buried Objects by Depositing Passive Superstrates
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Date
2016
Authors
Valagiannopoulos, Constantinos
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Abstract
One of the main problems when trying to detect
the position and other characteristics of a small inclusion into
lossy earth via external measurements is the inclusion’s poor
scattering response due to attenuation. Hence, increasing the
scattered power generated by the inclusion by using not an active
but a passive material is of great interest. To this direction, we
examine, in this work, a procedure of “unlocking” the ground by
depositing a thin passive layer of conventional material atop of
it. The first step is to significantly enhance the transmission into
a lossy half space, in the absence of the inclusion, by covering
it with a passive slab. The redistribution of the fields into the
slab and the infinite half space, due to the interplay of waves
between the interfaces, makes possible to determine the thickness
and permittivity of an optimal layer. The full boundary value
problem (including the inclusion and the deposited superstrate) is
solved semi-analytically via integral equations techniques. Then,
the scattered power of the buried inclusion is compared to the
corresponding quantity when no additional layer is present.
We report substantial improvement in the detectability of the
inclusion for several types of ground and burying depths by using
conventional realizable passive materials. Implementation aspects
in potential applications as well as possible future generalizations
are also discussed. The developed technique may constitute an
effective “configuration (structural) preprocessing” which may
be used as a first step in the analysis of related problems before
the application of an inverse scattering algorithm concerning the
efficient processing of the scattering data
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Keywords
Research Subject Categories::NATURAL SCIENCES::Physics, buried inclusion, inverse scattering, integral equations, detectability, mixing formulas
Citation
Constantinos Valagiannopoulos; 2016; “Unlocking” the Ground: Increasing the Detectability of Buried Objects by Depositing Passive Superstrates; IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING