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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Published in | Agriculture (Basel) Vol. 6; no. 4; p. 60 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Basel
MDPI AG
01.12.2016
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Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2077-0472 2077-0472 |
DOI: | 10.3390/agriculture6040060 |