A Printed Capacitance Sensor for Soil Moisture Measurement

design, development and evaluation of a continuous capacitance-based sensor for on-the-go soil moisture content measurement

soil compaction and moisture content are two of the factors that greatly influence variations in crop yield. capacitance-based sensor is a sensitive device for estimating soil water content. in this method of soil moisture content measurement, soil acts as the dielectric of the capacitor. throughout this research work, a capacitance-based moisture sensor that can measure the soil moisture conte...

A Semi-Cylindrical Capacitive Sensor Used for Soil Moisture Measurement

Differing from the structure of traditional parallel plate capacitive sensor a semi cylindrical capacitive sensor has been introduced in this present work to measure the soil moisture conveniently. Here, the numerical analysis method to evaluate the capacitance from the semi-cylindrical capacitive sensor is analyzed and discussed. The changes of capacitance with the variation of soil moisture o...

Improved Calibration Functions of Three Capacitance Probes for the Measurement of Soil Moisture in Tropical Soils

Single capacitance sensors are sensitive to soil property variability. The objectives of this study were to: (i) establish site-specific laboratory calibration equations of three single capacitance sensors (EC-20, EC-10, and ML2x) for tropical soils, and (ii) evaluate the accuracy and precision of these sensors. Intact soil cores and bulk samples, collected from the top 20 and 80 cm soil depths...

Capacitance Position Sensor for LISA Noise Measurement

This paper discusses two techniques investigated for use in a capacitance-based position sensor for the Eöt-Wash LISA noise measurement. The advantages and disadvantages of both techniques are reviewed and some elementary mathematical analysis is presented. A prototype implementation based on the more successful of the two techniques has been constructed.

Measurement of Available Soil Moisture