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dc.contributor.author
Schwank, Mike
dc.contributor.author
Green, Timothy R.
dc.date.accessioned
2019-06-13T15:21:11Z
dc.date.available
2017-06-10T17:43:09Z
dc.date.available
2019-06-13T15:21:11Z
dc.date.issued
2007-04
dc.identifier.issn
1424-8220
dc.identifier.other
10.3390/s7040548
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/67624
dc.identifier.doi
10.3929/ethz-b-000067624
dc.description.abstract
Dielectric measurement techniques are used widely for estimation of water contentin environmental media. However, factors such as temperature and salinity affecting thereadings require further quantitative investigation and explanation. Theoretical sensitivities ofcapacitance sensors to liquid salinity and temperature of porous media were derived andcomputed using a revised electrical circuit analogue model in conjunction with a dielectricmixing model and a finite element model of Maxwell’s equation to compute electrical fielddistributions. The mixing model estimates the bulk effective complex permittivities of solid-water-air media. The real part of the permittivity values were used in electric field simulations,from which different components of capacitance were calculated via numerical integration forinput to the electrical circuit analogue. Circuit resistances representing the dielectric losses werecalculated from the complex permittivity of the bulk soil and from the modeled fields. Resonantfrequencies from the circuit analogue were used to update frequency-dependent variables in aniterative manner. Simulated resonant frequencies of the capacitance sensor display sensitivitiesto both temperature and salinity. The gradients in normalized frequency with temperatureranged from negative to positive values as salinity increased from 0 to 10 g L-1. The modeldevelopment and analyses improved our understanding of processes affecting the temperatureand salinity sensitivities of capacitance sensors in general. This study provides a foundation forfurther work on inference of soil water content under field conditions.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Molecular Diversity Preservation International (MDPI)
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.subject
Soil water content
en_US
dc.subject
Capacitance
en_US
dc.subject
Permittivity
en_US
dc.subject
Electrical conductivity
en_US
dc.subject
Resonant frequency
en_US
dc.title
Simulated Effects of Soil Temperature and Salinity on Capacitance Sensor Measurements
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2007-04-26
ethz.journal.title
Sensors
ethz.journal.volume
7
en_US
ethz.journal.issue
4
en_US
ethz.pages.start
548
en_US
ethz.pages.end
577
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
005634210
ethz.publication.place
Basel
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-10T17:45:55Z
ethz.source
ECIT
ethz.identifier.importid
imp593650a95be9912489
ethz.ecitpid
pub:107565
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T11:55:34Z
ethz.rosetta.lastUpdated
2019-06-13T15:21:20Z
ethz.rosetta.versionExported
true
ethz.COinS
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