Capacitive throughput sensor for sugar beets and potatoes

Kumhála, F.; Prošek, V.; Blahovec, J.

doi:10.1016/j.biosystemseng.2008.10.002

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…The cantilever type acceleration sensor is a kind of capacitive sensors [ 57 , 58 ], and it follows the capacitor characteristic in the following equation [ 59 , 60 ]:

where C is the capacitance, ε 0 is the electric permittivity of vacuum, ε r is the relative permittivity of dielectric, A is the area, and d is the thickness of the dielectric. The parameter ε 0 is known as a constant 8.85 × 10 −12 F/m.…”

Section: Resultsmentioning

confidence: 99%

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Cantilever Type Acceleration Sensors Made by Roll-to-Roll Slot-Die Coating

Lee

2020

Sensors

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This paper presents the fabrication by means of roll-to-roll slot-die coating and characterization of air gap-based cantilever type capacitive acceleration sensors. As the mass of the sensor moves in the opposite direction of the acceleration, a capacitance change occurs. The sensor is designed to have a six layers structure with an air gap. Fabrication of the air gap and cantilever was enabled by coating and removing water-soluble PVA. The bottom electrode, the dielectric layer, and the sacrificial layer were formed using the roll-to-roll slot-die coating technique. The spacer, the top electrode, and the structural layer were formed by spin coating. Several kinds of experiments were conducted for characterization of the fabricated sensor samples. Experimental results show that accelerations of up to 3.6 g can be sensed with an average sensitivity of 0.00856 %/g.

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“…The cantilever type acceleration sensor is a kind of capacitive sensors [ 57 , 58 ], and it follows the capacitor characteristic in the following equation [ 59 , 60 ]:

Section: Resultsmentioning

confidence: 99%

“…The cantilever type acceleration sensor is a kind of capacitive sensors [57,58], and it follows the capacitor characteristic in the following equation [59,60]:…”

Section: Electrical Characteristics Of the Sensor Samplesmentioning

confidence: 99%

Cantilever Type Acceleration Sensors Made by Roll-to-Roll Slot-Die Coating

Lee

2020

Sensors

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“…The research was carried out using the methods of the theory of agricultural machines, analytical mechanics, higher mathematics, in particular the theory of oscillations, variational methods, methods for studying holonomic systems, as well as compiling programs carrying out numerical calculations of systems of differential equations, using a PC [21][22][23][24][25][26][27][28].…”

Section: Mathematical Descriptionmentioning

confidence: 99%

“…After substitution of (32) into expression (22), of expression (31) into expressions ( 23), ( 24), (25), after integrating the obtained expressions, we will have:…”

Section: Mathematical Descriptionmentioning

confidence: 99%

Mathematical Model of Root Crop Digging with Longitudinal Vibrations

Bulgakov¹,

Aboltins²,

Beloev³

et al. 2021

ENGMATH

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The problem how to reduce damage to tubers when they are dug up is urgent. For the new design of a vibrating digging working body for root crops the mathematical model of longitudinal vibrations of a root crop in the soil is developed as an elastic body in an elastically damped medium. The Ostrogradsky-Hamilton variational principle is applied for the analytical description of the process. The Ritz method was applied to find the frequencies of natural vibrations, the amplitudes of forced vibrations of a root crop as a solid elastic body when it is captured by a vibrating digging body. The frequency equation for the discussed vibrational process was obtained. The values of the first proper frequency of longitudinal vibrations of the considered elastic body of the root crop with specific geometric physical parameters are found. Graphs of the dependence of the first natural frequency upon the elastic deformation coefficient, the damping coefficient of the soil as an elastic damping medium are obtained. When the soil damping coefficient changes within 0 to 10 N•s 2 •m -3 , the first proper frequency changes within 500 to 750 s -1 (80 to 119 Hz) at soil elastic deformation coefficient 2•10 5 N•m -3 . Dependence of the elastic body forced vibration amplitude upon the change in the amplitude of the disturbing force have been obtained. When the amplitude of the disturbing force changes within 100 to 600 N, the amplitude of forced vibrations of the root crop body changes within 0.30 to 0.68 mm.

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“…Esses sensores têm sido empregados para determinar a umidade do solo, devido ao valor da constante dielétrica da água. Segundo alguns autores, Rusiniak (2002), Chang et al (2007), Kumhála et al (2008), Frangi et al (2009), Benedetto (2010) e Monsen-Nia et al (2010), este valor é de 78-80, em contraste com o solo, cujo valor pode chegar a até 14. Assim, a constante dielétrica é altamente relacionada com o teor de água no solo (Kizito et al, 2008).…”

Section: Introductionunclassified

Manejo da irrigação utilizando sensor da umidade do solo alternativo

Freitas

Carvalho

Braga

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M OUm sensor alternativo utilizando a medida da capacitância para determinação da umidade do solo foi desenvolvido e calibrado em laboratório, e avaliado por meio da comparação com tensiômetros, no manejo da irrigação da cultura do feijoeiro. Utilizou-se um delineamento inteiramente casualizado com 5 repetições e esquema fatorial com dois métodos de manejo (alternativo e tensiometria) além tensões de água no solo (20, 40 e 60 kPa). Observou-se que, independente do método empregado, a produção do feijoeiro foi maior quando submetido a tensão de 39 kPa; entretanto, o manejo da irrigação utilizandose o método alternativo levou a um número maior de irrigações e também do volume de água aplicado, com consequente redução da eficiência do uso da água em comparação com o uso de tensiômetros. Palavras-chave: capacitância, feijão, tensão de água no soloIrrigation scheduling using alternative soil moisture sensor A B ST R A C T An alternative sensor using a capacitance measurement for determining soil moisture was developed and calibrated in the laboratory and evaluated by comparison with tensiometers in the irrigation of common bean. A completely randomized design was used with five replications and a factorial with two methods of management (alternative and tensiometer) and soil water tensions (20, 40 and 60 kPa). It was observed that regardless of the method, the bean yield was higher when subjected to stress of 39 kPa, however, irrigation management using the alternative method led to a greater number of irrigation and also the volume of water applied, with consequent reduction in water use efficiency compared to the use of tensiometers.

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Capacitive throughput sensor for sugar beets and potatoes

Cited by 16 publications

References 14 publications

Cantilever Type Acceleration Sensors Made by Roll-to-Roll Slot-Die Coating

Cantilever Type Acceleration Sensors Made by Roll-to-Roll Slot-Die Coating

Mathematical Model of Root Crop Digging with Longitudinal Vibrations

Manejo da irrigação utilizando sensor da umidade do solo alternativo

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