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Agriculture 2016, 6(4), 60; doi:10.3390/agriculture6040060

Frequency Domain Probe Design for High Frequency Sensing of Soil Moisture

1
United States Department of Agriculture-Agricultural Research Services, 1604 E. FM 1294, Lubbock, TX 79403, USA
2
United States Department of Agriculture-Agricultural Research Services, 2300 Experiment Station Rd., Bushland, TX 79012, USA
3
United States Department of Agriculture-Agricultural Research Services, 2150 Centre Ave., Bldg D., STE. 200, Fort Collins, CO 80526, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Ritaban Dutta
Received: 11 September 2016 / Revised: 27 October 2016 / Accepted: 5 November 2016 / Published: 11 November 2016
(This article belongs to the Special Issue Big Data Application in Agriculture)
View Full-Text   |   Download PDF [2350 KB, uploaded 11 November 2016]   |  

Abstract

Accurate moisture sensing is an important need for many research programs as well as in control of industrial processes. This paper describes the development of a high accuracy frequency domain sensing probe for use in obtaining dielectric measurements of materials suitable for work ranging from 300 MHz to 1 GHz. The probe was developed to accommodate a wide range of permittivity’s ranging from εr = 2.5 to elevated permittivity’s as high as εr = 40. The design provides a well-matched interface between the soil and the interconnecting cables. A key advantage of the frequency domain approach is that a change of salt concentration has a significantly reduced effect on ε′, versus the traditional time-domain reflectometry, TDR, measured apparent permittivity, Ka. View Full-Text
Keywords: TDR; soil moisture sensing; soil moisture; frequency domain sensing; permittivity; dielectric constant TDR; soil moisture sensing; soil moisture; frequency domain sensing; permittivity; dielectric constant
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Pelletier, M.G.; Schwartz, R.C.; Holt, G.A.; Wanjura, J.D.; Green, T.R. Frequency Domain Probe Design for High Frequency Sensing of Soil Moisture. Agriculture 2016, 6, 60.

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