Draft:TDR and TDT soil moisture sensor

Submission declined on 19 December 2024 by Idoghor Melody (talk).

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Declined by Idoghor Melody 4 hours ago. Last edited by 62.224.214.8 3 seconds ago. Reviewer: Inform author.

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TDR and TDT soil moisture sensors measure the dielectric constant of a certain volume element around the sensor by measuring the speed of propagation along a short transmission line. From that the soil moisture can be derived.

In TDR (Time-domain reflectometry) method a short open ended transmission line formed by three rods are placed in the soil. A pulse is sent on the transmission line and received back. The bulk electrical conductivity (BEC, salinity) distorts the signal^[1] and processing is required to derive the correct transmission delay. The open-ended rods make it easy to probe soil.

TDT (Time-domain transmission) method uses a transmission line that loops back where on one end sits the sender and on the other the receiver. Due to better signal quality their design can be simpler^[2] and more tolerant to the porosity of the soil. They are more suitable when being buried permanently.

^ Jones, Scott B.; Or, Dani (2004). "Frequency domain analysis for extending time domain reflectometry water content measurement in highly saline soils". Soil Science Society of America Journal. 68 (5). Wiley Online Library: 1568–1577. doi:10.2136/sssaj2004.1568.
^ Blonquist, J.M.; Jones, Scott B.; Robinson, D.A. (2005). "A time domain transmission sensor with TDR performance characteristics". Journal of Hydrology. 314 (1–4). Elsevier: 235–245. doi:10.1016/j.jhydrol.2005.03.009.
^ Becker, Rolf; Scheuermann, Alexander; Schlaeger, Stefan; Hübner, Christof; Wagner, Norman (June 2008). Spatial Time Domain Reflectometry (Spatial TDR) - Principles, limitations and accuracy. pp. 181–187. doi:10.1201/9780203884430.ch20. ISBN 978-0-415-47692-8.

[1] Jones, Scott B.; Or, Dani (2004). "Frequency domain analysis for extending time domain reflectometry water content measurement in highly saline soils". Soil Science Society of America Journal. 68 (5). Wiley Online Library: 1568–1577. doi:10.2136/sssaj2004.1568.

[2] Blonquist, J.M.; Jones, Scott B.; Robinson, D.A. (2005). "A time domain transmission sensor with TDR performance characteristics". Journal of Hydrology. 314 (1–4). Elsevier: 235–245. doi:10.1016/j.jhydrol.2005.03.009.

[3] Becker, Rolf; Scheuermann, Alexander; Schlaeger, Stefan; Hübner, Christof; Wagner, Norman (June 2008). Spatial Time Domain Reflectometry (Spatial TDR) - Principles, limitations and accuracy. pp. 181–187. doi:10.1201/9780203884430.ch20. ISBN 978-0-415-47692-8.

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See also