High dielectric insulation coating for time domain reflectometry soil moisture sensor

High dielectric insulation coating for time domain reflectometry soil moisture sensor

Insulation coating is often applied to time domain reflectometry (TDR) soil moisture sensors to reduce the conduction loss of energy. However, because of low dielectric constants of common plastic insulation materials, sensitivity is reduced, and the measurements are strongly dependent on coating th...

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Veröffentlicht in:Water resources research 2004-04, Vol.40 (4), p.n/a
Hauptverfasser: Fujiyasu, Y, Pierce, C.E, Fan, L, Wong, C.P
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Sprache:eng
Schlagworte:
dielectric constant
epoxy-ceramic nanocomposite
high dielectric insulation coating
soil moisture probe
time domain reflectometry (TDR)
water content measurement
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creator Fujiyasu, Y
Pierce, C.E
Fan, L
Wong, C.P
description Insulation coating is often applied to time domain reflectometry (TDR) soil moisture sensors to reduce the conduction loss of energy. However, because of low dielectric constants of common plastic insulation materials, sensitivity is reduced, and the measurements are strongly dependent on coating thickness. Analytical studies clearly showed that these unwanted features could be mitigated if a high dielectric material is used for coating. An epoxy‐ceramic nanocomposite was selected as a high dielectric insulation material because of its high dielectric constant and high adhesion. Experimental work using this composite indicated that the material has the potential to be used as a high dielectric coating for TDR soil moisture probes. On the basis of the results of these analytical and experimental studies a framework for designing an improved epoxy‐ceramic composite for coating TDR soil moisture sensors is suggested.
doi_str_mv 10.1029/2003WR002460
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source Wiley Online Library Journals Frontfile Complete; Wiley Online Library AGU 2017; EZB-FREE-00999 freely available EZB journals
subjects dielectric constant
epoxy-ceramic nanocomposite
high dielectric insulation coating
soil moisture probe
time domain reflectometry (TDR)
water content measurement
title High dielectric insulation coating for time domain reflectometry soil moisture sensor
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