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Frequency Domain Probe Design for High Frequency Sensing of Soil Moisture

Author

Listed:
  • Mathew G. Pelletier

    (United States Department of Agriculture-Agricultural Research Services, 1604 E. FM 1294, Lubbock, TX 79403, USA)

  • Robert C. Schwartz

    (United States Department of Agriculture-Agricultural Research Services, 2300 Experiment Station Rd., Bushland, TX 79012, USA)

  • Greg A. Holt

    (United States Department of Agriculture-Agricultural Research Services, 1604 E. FM 1294, Lubbock, TX 79403, USA)

  • John D. Wanjura

    (United States Department of Agriculture-Agricultural Research Services, 1604 E. FM 1294, Lubbock, TX 79403, USA)

  • Timothy R. Green

    (United States Department of Agriculture-Agricultural Research Services, 2150 Centre Ave., Bldg D., STE. 200, Fort Collins, CO 80526, USA)

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 ε r = 2.5 to elevated permittivity’s as high as ε 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 ε′, versus the traditional time-domain reflectometry, TDR, measured apparent permittivity, Ka.

Suggested Citation

  • Mathew G. Pelletier & Robert C. Schwartz & Greg A. Holt & John D. Wanjura & Timothy R. Green, 2016. "Frequency Domain Probe Design for High Frequency Sensing of Soil Moisture," Agriculture, MDPI, vol. 6(4), pages 1-12, November.
    • Handle: RePEc:gam:jagris:v:6:y:2016:i:4:p:60-:d:82665
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