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Improvement in sensitivity of an inductive oil palm fruit sensor.

Misron N, Harun NH, Lee YK, Sidek RM, Aris I, Wakiwaka H, Tashiro K - Sensors (Basel) (2014)

Bottom Line: The sensitivity of such a sensor plays a crucial role in determining the effectiveness of the method.This paper investigates the results pertaining to the effects of the air coil structure of an oil palm fruit sensor, taking consideration of the used copper wire diameter ranging from 0.10 mm to 0.18 mm with 60 turns.The result from this study is important to improve the sensitivity of the inductive oil palm fruit sensor mainly with regards to the design of the air coil structure.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Engineering, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia. norhisam@eng.upm.edu.my.

ABSTRACT
Among palm oil millers, the ripeness of oil palm Fresh Fruit Bunch (FFB) is determined through visual inspection. To increase the productivity of the millers, many researchers have proposed with a new detection method to replace the conventional one. The sensitivity of such a sensor plays a crucial role in determining the effectiveness of the method. In our preliminary study a novel oil palm fruit sensor to detect the maturity of oil palm fruit bunches is proposed. The design of the proposed air coil sensor based on an inductive sensor is further investigated to improve its sensitivity. This paper investigates the results pertaining to the effects of the air coil structure of an oil palm fruit sensor, taking consideration of the used copper wire diameter ranging from 0.10 mm to 0.18 mm with 60 turns. The flat-type shape of air coil was used on twenty samples of fruitlets from two categories, namely ripe and unripe. Samples are tested with frequencies ranging from 20 Hz to 120 MHz. The sensitivity of the sensor between air to fruitlet samples increases as the coil diameter increases. As for the sensitivity differences between ripe and unripe samples, the 5 mm air coil length with the 0.12 mm coil diameter provides the highest percentage difference between samples and it is amongst the highest deviation value between samples. The result from this study is important to improve the sensitivity of the inductive oil palm fruit sensor mainly with regards to the design of the air coil structure. The efficiency of the sensor to determine the maturity of the oil palm FFB and the ripening process of the fruitlet could further be enhanced.

No MeSH data available.


The normalized resonant frequency for 5 mm air coil length.
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f7-sensors-14-02431: The normalized resonant frequency for 5 mm air coil length.

Mentions: The experiments conducted for all twenty sensors of various air coil lengths and coil diameters are targeted to collect the resonance characteristics of the sensor. The resonance frequency is then plotted against the air coil length and coil diameter to investigate the effects of both on the resonance characteristics of the sensor. The value of the resonance frequency of fruitlet samples is then normalized to the value of the resonance frequency of air. Among all twenty sensors, the 5 mm air coil length for various coil diameters are selected to be highlighted in Figure 7. The 5 mm air coil length shows promising and outstanding results compared to the other air coil lengths used in this investigation. The resonant frequencies for all ten samples for each category are plotted. Figures 7a,c,e and g show the resonance frequencies for all the samples. The graph shows a similar pattern for all samples, regardless of the coil diameter. The resonance frequency of air leads the resonance frequency of ripe and unripe samples. To clarify the observation, the resonance frequency for each type of coil diameter is then being normalized to the resonance frequency of air. Figures 7b,d,f and h show the graph of the normalized resonance frequency. The value of the normalized resonance frequency is then further analyzed with the calculation of the mean value between ripe to unripe samples. The mean value for each coil diameter is presented as dotted lines on the normalized resonance frequency graph. From Table 3, it can be observed that the 5 mm air coil length with the 0.14 mm coil diameter shows the highest mean value which is 12.9 × 10−3. It is then followed by the 0.12 mm coil diameter sensor whose mean value is 11.2 × 10−3. Results from the normalized resonant frequency is then further discussed and analyzed in determining the sensitivity of the sensor to ripe and unripe samples. In this research, the sensitivity is defined as the deviation between the mean values of ripe to unripe samples.


Improvement in sensitivity of an inductive oil palm fruit sensor.

Misron N, Harun NH, Lee YK, Sidek RM, Aris I, Wakiwaka H, Tashiro K - Sensors (Basel) (2014)

The normalized resonant frequency for 5 mm air coil length.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3958233&req=5

f7-sensors-14-02431: The normalized resonant frequency for 5 mm air coil length.
Mentions: The experiments conducted for all twenty sensors of various air coil lengths and coil diameters are targeted to collect the resonance characteristics of the sensor. The resonance frequency is then plotted against the air coil length and coil diameter to investigate the effects of both on the resonance characteristics of the sensor. The value of the resonance frequency of fruitlet samples is then normalized to the value of the resonance frequency of air. Among all twenty sensors, the 5 mm air coil length for various coil diameters are selected to be highlighted in Figure 7. The 5 mm air coil length shows promising and outstanding results compared to the other air coil lengths used in this investigation. The resonant frequencies for all ten samples for each category are plotted. Figures 7a,c,e and g show the resonance frequencies for all the samples. The graph shows a similar pattern for all samples, regardless of the coil diameter. The resonance frequency of air leads the resonance frequency of ripe and unripe samples. To clarify the observation, the resonance frequency for each type of coil diameter is then being normalized to the resonance frequency of air. Figures 7b,d,f and h show the graph of the normalized resonance frequency. The value of the normalized resonance frequency is then further analyzed with the calculation of the mean value between ripe to unripe samples. The mean value for each coil diameter is presented as dotted lines on the normalized resonance frequency graph. From Table 3, it can be observed that the 5 mm air coil length with the 0.14 mm coil diameter shows the highest mean value which is 12.9 × 10−3. It is then followed by the 0.12 mm coil diameter sensor whose mean value is 11.2 × 10−3. Results from the normalized resonant frequency is then further discussed and analyzed in determining the sensitivity of the sensor to ripe and unripe samples. In this research, the sensitivity is defined as the deviation between the mean values of ripe to unripe samples.

Bottom Line: The sensitivity of such a sensor plays a crucial role in determining the effectiveness of the method.This paper investigates the results pertaining to the effects of the air coil structure of an oil palm fruit sensor, taking consideration of the used copper wire diameter ranging from 0.10 mm to 0.18 mm with 60 turns.The result from this study is important to improve the sensitivity of the inductive oil palm fruit sensor mainly with regards to the design of the air coil structure.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Engineering, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia. norhisam@eng.upm.edu.my.

ABSTRACT
Among palm oil millers, the ripeness of oil palm Fresh Fruit Bunch (FFB) is determined through visual inspection. To increase the productivity of the millers, many researchers have proposed with a new detection method to replace the conventional one. The sensitivity of such a sensor plays a crucial role in determining the effectiveness of the method. In our preliminary study a novel oil palm fruit sensor to detect the maturity of oil palm fruit bunches is proposed. The design of the proposed air coil sensor based on an inductive sensor is further investigated to improve its sensitivity. This paper investigates the results pertaining to the effects of the air coil structure of an oil palm fruit sensor, taking consideration of the used copper wire diameter ranging from 0.10 mm to 0.18 mm with 60 turns. The flat-type shape of air coil was used on twenty samples of fruitlets from two categories, namely ripe and unripe. Samples are tested with frequencies ranging from 20 Hz to 120 MHz. The sensitivity of the sensor between air to fruitlet samples increases as the coil diameter increases. As for the sensitivity differences between ripe and unripe samples, the 5 mm air coil length with the 0.12 mm coil diameter provides the highest percentage difference between samples and it is amongst the highest deviation value between samples. The result from this study is important to improve the sensitivity of the inductive oil palm fruit sensor mainly with regards to the design of the air coil structure. The efficiency of the sensor to determine the maturity of the oil palm FFB and the ripening process of the fruitlet could further be enhanced.

No MeSH data available.