Frequency Domain Probe Design for High Frequency Sensing of Soil Moisture

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...

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Bibliographic Details
Published in:Agriculture (Basel) 2016-12, Vol.6 (4), p.60-60
Main Authors: Pelletier, Mathew G, Schwartz, Robert C, Holt, Greg A, Wanjura, John D, Green, Timothy R
Format: Article
Language:English
Subjects:
Accuracy
Agricultural research
Algorithms
Design
dielectric constant
frequency domain sensing
permittivity
Salinity
soil moisture
soil moisture sensing
Soils
TDR
Wire
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Summary: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 [straight epsilon]r = 2.5 to elevated permittivity's as high as [straight epsilon]r = 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 [straight epsilon]', versus the traditional time-domain reflectometry, TDR, measured apparent permittivity, Ka.
ISSN:2077-0472
2077-0472
DOI:10.3390/agriculture6040060