[735] - Quantification of sensor-to-sensor variability of the ECH2O EC-5, TE and 5TE sensors in dielectric liquids

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Rosenbaum, U., Huisman, J. A., Weuthen, A., Vereecken, H., Bogena, H., 2010. Quantification of sensor-to-sensor variability of the ECH2O EC-5, TE and 5TE sensors in dielectric liquids. Vadose Zone Journal, 9 (1), 181 - 186. DOI: 10.2136/vzj2009.0036.
Title(s):Main Title: Quantification of sensor-to-sensor variability of the ECH2O EC-5, TE and 5TE sensors in dielectric liquids
Description(s):Abstract: Low-budget sensors used in wireless soil water content sensor networks typically show considerable variation. Because of the large number of sensors in sensor network applications, it is not feasible to account for this variability using a calibration between sensor response and soil water content. An alternative approach is to split the calibration into two parts: (i) determination of sensor response–permittivity relationships using standard liquids with a defined reference permittivity, and (ii) site-specific calibration between permittivity and soil water content using a subset of sensors. In this study, we determined sensor response–permittivity relationships for several ECH2O, EC-5, TE, and 5TE sensors by Decagon Devices (Pullman, WA). The objectives of this study were to determine (i) the sensor-to-sensor variability and precision of these sensor types, and (ii) the increase in accuracy when a sensor-specific calibration is used instead of a single calibration. The results showed that the sensor-to-sensor variability was significantly larger than the measurement noise for each sensor type. When a sensor-specific calibration was used, the RMSE expressed in (equivalent) soil water content ranged from 0.008 cm3 cm23 for the TE sensor to 0.014 cm3 cm23 for the EC-5 sensor in a permittivity range between ~2 and 35. When a single calibration was used, the RMSE was higher and ranged from 0.01 cm3 cm23 for the 5TE sensor to 0.02 cm3 cm23 for the TE sensor. An improvement in accuracy of nearly 0.01 cm3 cm23 can be reached in the high-permittivity range for each sensor type by calibrating each sensor individually.
Identifier(s):DOI: 10.2136/vzj2009.0036
Responsible Party
Creator(s):Author: Ulrike Rosenbaum
Author: Johan A. Huisman
Author: Ansgar Weuthen
Author: Harry Vereecken
Author: Heye Bogena
Publisher:Soil Science Society of America
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: SRP, Soil Water Content, Sensor
File Details
File Name:2010_Rosenbaum_VZJ.pdf
Data Type:Text
Size(s):6 Pages
File Size:784 kB (0.766 MB)
Date(s):Issued: 2010-01-11
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - Publication
Article Type:Journal
Source:Vadose Zone Journal
Number Of Pages:6
Page Range:181 - 186
Metadata Details
Metadata Creator:Ulrike Rosenbaum
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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