Consideration of theoretical equation for output voltage of linear displacement sensor using meander coil and pattern guide

Misron, Norhisam; Norrimah, A.; Wagiran, Rahman; Sidek, Roslina Mohd; Mariun, Norman; Wakiwaka, Hiroyuki

doi:10.1016/j.sna.2008.05.033

Cited by 20 publications

(17 citation statements)

References 1 publication

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“…Generally, the ripening process starts from an apical fruitlet and gradually spreads to the basal part of the bunch [21] as shown in Figure 2.…”

Section: Oil Palm Fresh Fruit Bunchesmentioning

confidence: 99%

“…In the prevailing research works from the literature, the inductive concept has not been proposed and attempted for maturity determination of FFBs [20]. The proposed inductive concept is a non destructive testing method and show potentiality for outdoor testing [21,22]. The detection concept is based on the moisture content of the fruitlet, where the permeability value of water is 1.2566270 × 10 −6 .…”

Section: Introductionmentioning

confidence: 99%

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Investigations on a Novel Inductive Concept Frequency Technique for the Grading of Oil Palm Fresh Fruit Bunches

Harun

Misron

Sidek

et al. 2013

Sensors

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From the Malaysian harvester's perspective, the determination of the ripeness of the oil palm (FFB) is a critical factor to maximize palm oil production. A preliminary study of a novel oil palm fruit sensor to detect the maturity of oil palm fruit bunches is presented. To optimize the functionality of the sensor, the frequency characteristics of air coils of various diameters are investigated to determine their inductance and resonant characteristics. Sixteen samples from two categories, namely ripe oil palm fruitlets and unripe oil palm fruitlets, are tested from 100 Hz up to 100 MHz frequency. The results showed the inductance and resonant characteristics of the air coil sensors display significant changes among the samples of each category. The investigations on the frequency characteristics of the sensor air coils are studied to observe the effect of variations in the coil diameter. The effect of coil diameter yields a significant 0.02643 MHz difference between unripe samples to air and 0.01084 MHz for ripe samples to air. The designed sensor exhibits significant potential in determining the maturity of oil palm fruits.

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“…Generally, the ripening process starts from an apical fruitlet and gradually spreads to the basal part of the bunch [21] as shown in Figure 2.…”

Section: Oil Palm Fresh Fruit Bunchesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations on a Novel Inductive Concept Frequency Technique for the Grading of Oil Palm Fresh Fruit Bunches

Harun

Misron

Sidek

et al. 2013

Sensors

View full text Add to dashboard Cite

show abstract

“…resolution, accuracy or miniaturization, they have superior performance and hence are widely used in harsh working environments [7]- [14], for that inductive techniques are less affected by undesired matter like water, dust, or oil, and usually use symmetrical structure to cancel electromagnetic noise [15], [16]. Recent inductive sensors trend to use printed circuit board (PCB) [17] or other technologies [18], [19] to lower sensor cost, improve compactness, etc.…”

Section: Introductionmentioning

confidence: 99%

An Inductive Angular Displacement Sensor Based on Planar Coil and Contrate Rotor

Tang

Peng

et al. 2015

IEEE Sensors J.

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This paper introduces a noncontact, low-cost, and reliable inductive sensor for angular displacement measurement. It is suitable to work in harsh industrial environments. The sensor has simple structure consisting of three key parts: 1) a ferromagnetic stator, which is a pure plane; 2) a ferromagnetic rotor, which has face slots; and 3) four layers of planar copper coils, including primary and secondary coils. Primary coils are supplied with two orthogonal 4000-Hz ac, and secondary coils output a signal whose phase is proportional to angular displacement. Primary coils are designed with sinusoidal shape, so that magnetic field between the stator and rotor has approximately sinusoidal distribution, and finally linearity between the phase variation of output signal and angular displacement is well helped by this design. The structure and working principles of the sensor are explained in detail. Moreover, a sensor model was simulated to verify the feasibility of the sensor working principles and a sensor prototype was designed for actual experiment. At last actual experiment results are given and analyzed, showing that the sensor prototype has achieved accuracy better than ±12 arcsec in the range of 0°-360°, and this kind of sensor may have a better performance by improving the layout of primary coils and front-end signal-process circuit.Index Terms-Non-contact inductive sensor, angular displacement, planar coils, contrate rotor, sinusoidal shape.

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“…As they are mutual induction amplitude systems, they depend on the frequency of the driving signal [8–11]. …”

Section: Introductionmentioning

confidence: 99%

Magnetic Sensor for Building Structural Vibrations

García

Morón

Tremps

2014

Sensors

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This paper shows a new displacement-to-frequency transducer based on the variation of a coil inductance when a magnetic core is partially or completely inserted inside. This transducer is based on a Colpitts oscillator due its low manufacturing price, behavior and immunity to noise. A tank circuit with a configuration in parallel was used because it can be employed at lower frequencies and it enables it to make a direct analysis. The sensor has a dynamic range equal to the length of the coil. The cores can exchange sensors (coils with its ferromagnetic core) using the same electronic measuring system. In this way, with only an electronic circuit, the core sensor determines the measurement range. The obtained resolution is higher than 1/100,000, and the sensor also allows the measurement and knowing in real time the effect of vibration, thermal expansion, referred overload movements, etc.., that can occur in the structural elements of a building.

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Consideration of theoretical equation for output voltage of linear displacement sensor using meander coil and pattern guide

Cited by 20 publications

References 1 publication

Investigations on a Novel Inductive Concept Frequency Technique for the Grading of Oil Palm Fresh Fruit Bunches

Investigations on a Novel Inductive Concept Frequency Technique for the Grading of Oil Palm Fresh Fruit Bunches

An Inductive Angular Displacement Sensor Based on Planar Coil and Contrate Rotor

Magnetic Sensor for Building Structural Vibrations

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