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A small-scale matric potential sensor based on time domain reflectometry

Persson, Magnus LU ; Wraith, JM and Dahlin, Torleif LU (2006) In Soil Science Society of America Journal 70(2). p.533-536
Abstract
Measurements of soil matric potential (Psi) are needed in many soil science applications. In the present study, a small matric potential sensor having a length of 30 mm and a diameter of 9.6 mm was developed. The sensor consists of two coils made of lacquer-coated copper wires embedded in gypsum. The dielectric constant of the gypsum (K-gypsum) was measured with time domain reflectometry (TDR). The gypsum probes were tested in a sandy loam soil using a pressure extractor to obtain the relationship between K-gypsum and Psi, allowing inference of the soil Psi in equilibrium with the sensor. It was shown that the gypsum probe could give Psi estimates with a root mean square error (RMSE) of around 50 kPa in the range of -20 to -1500 kPa. Most... (More)
Measurements of soil matric potential (Psi) are needed in many soil science applications. In the present study, a small matric potential sensor having a length of 30 mm and a diameter of 9.6 mm was developed. The sensor consists of two coils made of lacquer-coated copper wires embedded in gypsum. The dielectric constant of the gypsum (K-gypsum) was measured with time domain reflectometry (TDR). The gypsum probes were tested in a sandy loam soil using a pressure extractor to obtain the relationship between K-gypsum and Psi, allowing inference of the soil Psi in equilibrium with the sensor. It was shown that the gypsum probe could give Psi estimates with a root mean square error (RMSE) of around 50 kPa in the range of -20 to -1500 kPa. Most of the sensitivity of the sensor was in the -50- to -1000-kPa range. (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
in
Soil Science Society of America Journal
volume
70
issue
2
pages
533 - 536
publisher
Soil Science Society of Americ
external identifiers
  • wos:000236009100024
  • scopus:33645048431
ISSN
0361-5995
DOI
10.2136/sssaj2005.0209N
language
English
LU publication?
yes
id
4b9239bc-f552-458a-a0c1-3cbed7612daa (old id 415281)
date added to LUP
2016-04-01 15:22:55
date last changed
2020-04-07 03:16:58
@article{4b9239bc-f552-458a-a0c1-3cbed7612daa,
  abstract     = {Measurements of soil matric potential (Psi) are needed in many soil science applications. In the present study, a small matric potential sensor having a length of 30 mm and a diameter of 9.6 mm was developed. The sensor consists of two coils made of lacquer-coated copper wires embedded in gypsum. The dielectric constant of the gypsum (K-gypsum) was measured with time domain reflectometry (TDR). The gypsum probes were tested in a sandy loam soil using a pressure extractor to obtain the relationship between K-gypsum and Psi, allowing inference of the soil Psi in equilibrium with the sensor. It was shown that the gypsum probe could give Psi estimates with a root mean square error (RMSE) of around 50 kPa in the range of -20 to -1500 kPa. Most of the sensitivity of the sensor was in the -50- to -1000-kPa range.},
  author       = {Persson, Magnus and Wraith, JM and Dahlin, Torleif},
  issn         = {0361-5995},
  language     = {eng},
  number       = {2},
  pages        = {533--536},
  publisher    = {Soil Science Society of Americ},
  series       = {Soil Science Society of America Journal},
  title        = {A small-scale matric potential sensor based on time domain reflectometry},
  url          = {https://lup.lub.lu.se/search/ws/files/4380399/4934428.pdf},
  doi          = {10.2136/sssaj2005.0209N},
  volume       = {70},
  year         = {2006},
}