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Instruments 2018, 2(3), 18; https://doi.org/10.3390/instruments2030018

Monitoring Moisture Content for Various Kind of Tea Leaves in Drying Processes Using RF Reflectometer-Sensor System

1
School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, 81310 Johor, Malaysia
2
i-Stone Technology, Skudai, 81310 Johor, Malaysia
3
Department of Electrical and Electronics Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 53300 Setapak, Kuala Lumpur, Malaysia
4
School of Mechatronic Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia
5
Department of Electronic Engineering Technology, Faculty of Engineering Technology, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia
*
Author to whom correspondence should be addressed.
Received: 13 August 2018 / Revised: 9 September 2018 / Accepted: 13 September 2018 / Published: 17 September 2018
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Abstract

This paper presents tea leaves moisture monitoring system based on RF reflectometry techniques. The system was divided into two parts which are the sensor and reflectometer parts. The large coaxial probe was used as a sensor for the system. The reflectometer part plays a role as signal generator and also data acquisition. The reflectometer-sensor system was operated with a graphical user interface at 1.529 GHz at room temperature. The system was able to measure the moisture content of tea leaves ranging 0% m.c to 50% m.c on a wet basis. In this study, up to five kinds of tea leaves bulk were tested. The mean of absolute errors in the moisture measurement for tea leaves was ±2. View Full-Text
Keywords: tea leaves; microcontroller-based RF reflectometer; large open-ended coaxial probe; reflected voltage; moisture content tea leaves; microcontroller-based RF reflectometer; large open-ended coaxial probe; reflected voltage; moisture content
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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You, K.Y.; Lee, C.Y.; Chan, K.S.; Lee, K.Y.; Cheng, E.M.; Lee, Y.S. Monitoring Moisture Content for Various Kind of Tea Leaves in Drying Processes Using RF Reflectometer-Sensor System. Instruments 2018, 2, 18.

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