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Article
Frequency domain π-phase-shift reflectrometry for soil moisture measurement : I. Theory.
Sensors and Actuators A: Physical (1996)
  • Xueqing Liu
  • Neville G. Pinto, University of Louisville
Abstract
The theoretical basis for a frequency domain π-shift reflectometer for measuring soil moisture content has been presented. This method uses an interferometry approach. It is shown that this narrow-band technique promises greater reliability and flexibility than the existing technique of time domain reflectrometry (TDR). In particular, it measures both dielectric constant and conductivity, which enables salt interference to be eliminated. A mathematical model has been developed to separate the effect of conductivity from that of the dielectric constant. Measurements are required at two distinct frequencies to minimize and enbale the dielectric constant and conductivity to be calculated numerically.
Keywords
  • Frequency domain reflectometry,
  • Phase shift,
  • Soil moisture measurement
Disciplines
Publication Date
July, 1996
DOI
10.1016/S0924-4247(97)80067-2
Citation Information
Xueqing Liu and Neville G. Pinto. "Frequency domain π-phase-shift reflectrometry for soil moisture measurement : I. Theory." Sensors and Actuators A: Physical Vol. 55 Iss. 2-3 (1996) p. 127 - 132
Available at: http://works.bepress.com/neville-pinto/26/