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Proceedings Paper

Development of the RF soil moisture sensors
Author(s): Jingheng Cheng; Xuemin Chen; Jing Li; Richard Liu
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Paper Abstract

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.

Paper Details

Date Published: 30 March 2006
PDF: 12 pages
Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 61671Q (30 March 2006); doi: 10.1117/12.660125
Show Author Affiliations
Jingheng Cheng, J&M Biotek International LLC (United States)
Xuemin Chen, Univ. of Houston (United States)
Jing Li, Univ. of Houston (United States)
Richard Liu, Univ. of Houston (United States)

Published in SPIE Proceedings Vol. 6167:
Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications
Daniele Inaudi; Wolfgang Ecke; Brian Culshaw; Kara J. Peters; Eric Udd, Editor(s)

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