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Sensors 2011, 11(4), 4073-4085; doi:10.3390/s110404073
Article

Determination of Moisture Content in Oil Palm Fruits Using a Five-Port Reflectometer

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Received: 8 March 2011; in revised form: 5 April 2011 / Accepted: 5 April 2011 / Published: 6 April 2011
(This article belongs to the Special Issue Sensors in Agriculture and Forestry)
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Abstract: This paper presents the development of a PC-based microwave five-port reflectometer for the determination of moisture content in oil palm fruits. The reflectometer was designed to measure both the magnitude and phase of the reflection coefficient of any passive microwave device. The stand-alone reflectometer consists of a PC, a microwave source, diode detectors and an analog to digital converter. All the measurement and data acquisition were done using Agilent VEE graphical programming software. The relectometer can be used with any reflection based microwave sensor. In this work, the application of the reflectometer as a useful instrument to determine the moisture content in oil palm fruits using monopole and coaxial sensors was demonstrated. Calibration equations between reflection coefficients and moisture content have been established for both sensors. The equation based on phase measurement of monopole sensor was found to be accurate within 5% in predicting moisture content in the fruits when compared to the conventional oven drying method.
Keywords: five-port reflectometer; coaxial sensor; monopole sensor; graphical programming; moisture; data acquisition five-port reflectometer; coaxial sensor; monopole sensor; graphical programming; moisture; data acquisition
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.

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MDPI and ACS Style

Yee, L.K.; Abbas, Z.; Jusoh, M.A.; Yeow, Y.K.; Meng, C.E. Determination of Moisture Content in Oil Palm Fruits Using a Five-Port Reflectometer. Sensors 2011, 11, 4073-4085.

AMA Style

Yee LK, Abbas Z, Jusoh MA, Yeow YK, Meng CE. Determination of Moisture Content in Oil Palm Fruits Using a Five-Port Reflectometer. Sensors. 2011; 11(4):4073-4085.

Chicago/Turabian Style

Yee, Lee Kim; Abbas, Zulkifly; Jusoh, Mohamad Ashry; Yeow, You Kok; Meng, Cheng Ee. 2011. "Determination of Moisture Content in Oil Palm Fruits Using a Five-Port Reflectometer." Sensors 11, no. 4: 4073-4085.



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