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http://dx.doi.org/10.5307/JBE.2003.28.4.369

Precision Measurement of Water Content in Soil Using Dual RF Impedance Changes  

김기복 (Smart Measurement Group, Center for Environment & Safety Measurement, Korea Research Institute of Standards and Science)
김상천 (School of Computer Information & Communication, Dong-Ju College)
주대성 (S. I. B. Co., Ltd.,)
윤동진 (Smart Measurement Group, Center for Environment & Safety Measurement, Korea Research Institute of Standards and Science)
Publication Information
Journal of Biosystems Engineering / v.28, no.4, 2003 , pp. 369-376 More about this Journal
Abstract
This study was conducted to develop a precision measurement method of water content in soil (find sand and silty sand) using dual RF impedance changes. The electrically stable perpendicular plate capacitive sensor was fabricated and utilized to sense the water content in soil. Crystal oscillators of 5 and 20 MHz and related circuits were designed to detect the capacitance changes of a perpendicular plate capacitive sensor with soil samples at various volumetric water contents. A multiple regression model for volumetric water content having dual oscillation frequency changes at 5 and 20 MHz as independent variables resulted in coefficient of determination of 0.963 and standard error calibration of 0.030 cm$^3$/cm$^3$ for calibration and coefficient of determination of 0.966, standard error of prediction of 0.027 cm$^3$/cm$^3$ and bias of 0.001 cm$^3$/cm$^3$ for prediction.
Keywords
Soil moisture; Volumetric water content; Perpendicular plate capacitive sensor; Dual RF impedance changes;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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