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| Titel |
A new TDR multiplexing system for reliable electrical conductivity and soil water content measurements |
| VerfasserIn |
Lutz Weihermueller, Sander Huisman, Normen Hermes, Stefanie Pickel, Harry Vereecken |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072649
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| Zusammenfassung |
| Time domain reflectometry (TDR) is a standard method to estimate soil water content and
bulk soil electrical conductivity. In many applications, several TDR probes are installed in
soil columns or field setups, and they are measured using a multiplexing system. It has been
reported that commercially available multiplexers share a common ground, which might lead
to inaccurate TDR measurements when probes are installed close together or at sites with
high electromagnetic noise. Therefore, a new eight-channel differential multiplexer
(50C81-SDM) was developed that allows communication with standard TDR equipment. The
50C81-SDM multiplexer was tested using measurement in electrolyte solutions and a sand
tank. In contrast to multiplexers with a common ground, they showed no interference of
closely spaced TDR probes. Measurements at a test site also showed the applicability of the
50C81-SDM multiplexer in an environment contaminated with high electromagnetic noise. |
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