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| Titel |
Efficient reconstruction of dispersive dielectric profiles using time domain reflectometry (TDR) |
| VerfasserIn |
P. Leidenberger, B. Oswald, K. Roth |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 10, no. 2 ; Nr. 10, no. 2 (2006-04-11), S.209-232 |
| Datensatznummer |
250007983
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| Publikation (Nr.) |
 copernicus.org/hess-10-209-2006.pdf |
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| Zusammenfassung |
| We present a numerical model for time domain reflectometry (TDR)
signal propagation in dispersive dielectric materials.
The numerical probe model is terminated with a parallel circuit, consisting
of an ohmic resistor and an ideal capacitance.
We derive analytical approximations for the capacitance, the inductance
and the conductance of three-wire probes.
We couple the time domain model with global optimization
in order to reconstruct water content profiles from TDR
traces.
For efficiently solving the inverse problem we use genetic algorithms
combined with a hierarchical parameterization.
We investigate the performance of the method by reconstructing
synthetically generated profiles.
The algorithm is then applied to retrieve dielectric profiles
from TDR traces measured in the field.
We succeed in reconstructing dielectric and ohmic profiles where conventional
methods, based on travel time extraction, fail. |
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