A small-scale matric potential sensor based on time domain reflectometry
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/415281
- author
- Persson, Magnus LU ; Wraith, JM and Dahlin, Torleif LU
- organization
- publishing date
- 2006
- 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
- 2022-01-28 05:05:10
@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/files/4380399/4934428.pdf}},
doi = {{10.2136/sssaj2005.0209N}},
volume = {{70}},
year = {{2006}},
}