Abstract

FZJ-2024-03389

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Capacitive coupling in broadband spectral electrical impedance tomography (sEIT) measurements with a centralized multiplexer

Wang, H. (Corresponding author)FZJ* ; Huisman, J. A.FZJ* ; Zimmermann, E.FZJ*

2024

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Please use a persistent id in citations: doi:10.34734/FZJ-2024-03389

Abstract: We analysed capacitive coupling in sEIT measurements associated with different cable types(shielded and unshielded) and measurement approaches (active and passive electrodes) using circuitmodels and actual sEIT field measurements. The modelling results showed the intricate trade-offsbetween wire-wire, wire-shield, and shield-soil capacitive coupling for shielded and unshieldedcables when using passive electrodes with a centralized multiplexer. The field measurements with acentralized multiplexer and a fan-shaped cable layout with elevated cables showed that unshieldedcables showed lower capacitive coupling than shielded cables because of the dominance of wire-shield capacitive coupling. Analysis using the developed circuit models showed that this result is aconsequence of the site conditions, and cannot be generalized.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)
2. Zentralinstitut für Elektronik (ZEA-2)

Research Program(s):

1. 2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217) (POF4-217)

Appears in the scientific report 2024

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