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Sensors 2017, 17(1), 52; doi:10.3390/s17010052

Relative Estimation of Water Content for Flat-Type Inductive-Based Oil Palm Fruit Maturity Sensor

1
Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2
Institute of Advance Technology (ITMA), Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
3
Medical Engineering Section, Universiti Kuala Lumpur-British Malaysia Institute, Batu 8, Jalan Sg Pusu, 53100 Gombak, Selangor, Malaysia
4
Faculty of Engineering, Shinshu University, Wakasato 4-17-1, Nagano 380-8553, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Simon X. Yang
Received: 13 July 2016 / Revised: 5 November 2016 / Accepted: 22 November 2016 / Published: 28 December 2016
(This article belongs to the Special Issue Sensors for Agriculture)
View Full-Text   |   Download PDF [2558 KB, uploaded 29 December 2016]   |  

Abstract

The paper aims to study the sensor that identifies the maturity of oil palm fruit bunches by using a flat-type inductive concept based on a resonant frequency technique. Conventionally, a human grader is used to inspect the ripeness of the oil palm fresh fruit bunch (FFB) which can be inconsistent and inaccurate. There are various new methods that are proposed with the intention to grade the ripeness of the oil palm FFB, but none has taken the inductive concept. In this study, the resonance frequency of the air coil is investigated. Samples of oil palm FFB are tested with frequencies ranging from 20 Hz to 10 MHz and the results obtained show a linear relationship between the graph of the resonance frequency (MHz) against time (Weeks). It is observed that the resonance frequencies obtained for Week 10 (pre-mature) and Week 18 (mature) are around 8.5 MHz and 9.8 MHz, respectively. These results are compared with the percentage of the moisture content. Hence, the inductive method of the oil palm fruit maturity sensor can be used to detect the change in water content for ripeness detection of the oil palm FFB. View Full-Text
Keywords: inductive concept; air coil; resonance frequency; oil palm; maturity classification; moisture content inductive concept; air coil; resonance frequency; oil palm; maturity classification; 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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MDPI and ACS Style

Misron, N.; Aliteh, N.A.; Harun, N.H.; Tashiro, K.; Sato, T.; Wakiwaka, H. Relative Estimation of Water Content for Flat-Type Inductive-Based Oil Palm Fruit Maturity Sensor. Sensors 2017, 17, 52.

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