Microstrip transmission line for soil moisture measurement

Chen, Xuemin; Li, Jing; Liang, Renyue; Sun, Yunxiang; Liu, C. Richard; Rogers, Richard G.; Claros, German

doi:10.1117/12.571448

Cited by 4 publications

(1 citation statement)

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“…The Subsurface Sensing Lab at the University of Houston has developed an innovative transmission line-based moisture sensor for in-situ measurement of moisture in an aggregate base and soil subgrade layers of pavements. It has the advantages of low cost, low power consumption and easier to use over other methods such as Time Domain Reflectometry (TDR) and the Capacitance Probe (CP) [1]. However, there is still room for improvement.…”

Section: Introductionmentioning

confidence: 99%

Development of the RF soil moisture sensors

Cheng

Chen

et al. 2006

SPIE Proceedings

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Accurate measurements of soil water content are important to land activities, especially those involving agriculture, forestry, hydrology, and engineering. In this paper, a theoretical and experimental study of the microwave moisture measurement sensors is conducted.A phase-based moisture sensor system using a transmission line sensor is designed. The amplitude of the transmission measurement is a strong function of the conductivity (loss of the media) and the imaginary part of the dielectric constant, and the phase is mainly a strong function of the real part of the dielectric constant. One can obtain the soil moisture information from measuring the phase shift of the transmitted waves. Microstrip resonator sensors are also studied and fabricated. The effective permittivity will change if a dielectric material is present near the substrate of the resonator, which causes the shift of the resonant frequency. The measured data show that both sensors are sensitive and accurate.

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Section: Introductionmentioning

confidence: 99%