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

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*Title:*	Main Title: Quantification of sensor-to-sensor variability of the ECH2O EC-5, TE and 5TE sensors in dielectric liquids
*Description:*	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:*	10.2136/vzj2009.0036 (DOI)

Responsible Party

*Creators:*	Ulrike Rosenbaum (Author), Johan A. Huisman (Author), Ansgar Weuthen (Author), Harry Vereecken (Author), Heye Bogena (Author)
*Publisher:*	Soil Science Society of America
*Publication Year:*	2013

Topic

*TR32 Topic:*	Soil
*Related Subproject:*	C1
*Subjects:*	Keywords: SRP, Soil Water Content, Sensor

File Details

*Filename:*	2010_Rosenbaum_VZJ.pdf
*Data Type:*	Text - Article
*Size:*	6 Pages
*File Size:*	784 KB
*Date:*	Issued: 11.01.2010
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	For internal use only
*Access Limitations:*	For internal use only
*Licence:*	[TR32DB] Data policy agreement

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Specific Information - Publication

*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Vadose Zone Journal
*Source Website:*	www.soils.org
*Issue:*	1
*Volume:*	9
*Number of Pages:*	6 (181 - 186)

Metadata Details

*Metadata Creator:*	Ulrike Rosenbaum
*Metadata Created:*	02.12.2013
*Metadata Last Updated:*	02.12.2013
*Subproject:*	C1
*Funding Phase:*	1
*Metadata Language:*	English
*Metadata Version:*	V50

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