Abstract
This paper describes a PC-based instrumentation system designed for online monitoring of the moisture content (MC) of tea leaves at its final stage. A fringe-field capacitive probe is used as a sensor to detect the MC of a tea leaf sample. The probe is mounted on the shaft of a stepper motor. The stepper motor is used to shake the tea leaf samples to obtain similar compactness for all tea leaf samples whose MCs are to be monitored. The introduction of shaking facility in the measurement procedure ensures consistency of measurement. The three-dimensional finite element method is used for the determination of field distribution around the surface of the sensor and the capacitance of the sensor
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