München 2004 – wissenschaftliches Programm

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UP: Umweltphysik

UP 7: Hydrosph
äre und Boden I

UP 7.1: Fachvortrag

Montag, 22. März 2004, 14:15–14:30, HS 020

Direct estimation of soil properties by using a modified electrical impedance tomography — •H. Lustfeld¹, A. Kemna², and G. Bene³ — ¹Forschungszentrum Jülich, IFF, 52425 Jülich, e-mail: h.lustfeld@fz-juelich.de — ²Forschungszentrum Jülich, ICG IV, 52425 Jülich, e-mail: a.kemna@fz-juelich.de — ³Institute for Theoretical Physics, Eötvös University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary, e-mail: bene@arpad.elte.hu

A major difficulty of electrical impedance tomography (EIT) is the ill-conditioned inverse problem when determining the conductivity from voltage measurements[1,2]. However, not the conductivity is of real interest but the properties of soil/biological tissue. It means that only certain Cole-Cole parameters can appear which are typical of the various kinds of soil/biological tissue. In our approach only these parameters occur in the cost function thus reducing the parameter space tremendously and as a consequence leading to much more stable solutions in multifrequency EIT.

[1] A. Kemna, A. Binley, A. Ramirez, W. Daily, Chem. Engng. J. 77, 11 (2000)

[2] A. Kemna, J. Vanderborght, B. Kulessa, H. Vereecken, J. Hydrol. 267, 125 (2002)