分布誘電率推定のための長間隔測定電極を用いた静電容量計測における円弧形補助電極の影響

Ohchi, Masashi; Furukawa, Toshiharu; Fukumoto, Hisao; Nagamachi, Satoshi

doi:10.1541/ieejfms.129.190

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…We have carried out numerous studies on estimating the internal permittivity distribution of subjects based on the spatial potential measured together with the capacitance. In traditional electromagnetics, it is thought that changing the position of the dielectric placed between there is the electrodes of a parallel plate capacitor has no influence on capacitance.…”

Section: Introductionmentioning

confidence: 99%

Study on estimating electric potential in space between parallel electrodes

Tsujita

Ohchi

Wakimoto

2019

Electrical Engineering Japan

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We have been studying on estimating distribution of permittivity between measurement electrodes using capacitance and electric potential. Two arc electrodes were separated by long distance and there electrodes were surrounded by additional electrodes respectively. In past research work, we carried out numerical electric analysis for calculating the capacitance and electric potential using Finite Element Method (FEM) and compared with experimental and numerical results. The capacitance values were almost agreed with experimental and numerical results. However, the electric potential values were different between experimental and numerical results in conventional studies. In this paper, we proposed an equivalent circuit including the stray capacity and measurement method for capacitance, the electric potential in space between long distance electrodes was estimated.

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Section: Introductionmentioning

confidence: 99%

Study on estimating electric potential in space between parallel electrodes

Tsujita

Ohchi

Wakimoto

2019

Electrical Engineering Japan

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“…Estimation of permittivity distribution inside measured objects is expected to be useful in nondestructive testing, evaluation of functionally graded materials, and other fields. One of methods for estimation of permittivity distribution called electrical capacitance tomography (ECT) is based on electrostatic capacitance.…”

Section: Introductionmentioning

confidence: 99%

Numerical electric field analysis of capacitance and potential in space for estimation of permittivity distribution

Yamanobe

Ohchi

2018

Electrical Engineering Japan

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We have been studying on measuring capacitance and potential using long‐distance electrode for estimating a permittivity distribution. The estimating method of permittivity distribution was proposed using finite element method (FEM) and genetic algorithm. However, the measurement accuracy was not reviewed. In this paper, we carried out numerical analysis using FEM in case of change of diameter, position, and permittivity of a rod of dielectric and discussed the measurement accuracy of capacitance and potential.

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“…In the past research, the capacitance of a target object having non-uniform permittivity is measured from its periphery, and the permittivity distribution inside the object is estimated by extrapolation [2][3][4][5][6][7][8][9][10]. In those studies, not only measurement experiments have been conducted, but a numerical analysis of an electric field using the finite element method has been reported.…”

Section: Introductionmentioning

confidence: 99%

“…In those studies, not only measurement experiments have been conducted, but a numerical analysis of an electric field using the finite element method has been reported. The numerical analysis conducted in the past, however, was a that of capacitance alone, using relatively coarse mesh data in a two-dimensional model [9]. Thus, in this study, in order to improve the estimation precision of distributed permittivity, the numerical analysis has been conducted using a three-dimensional model while focusing on electric potential in space between two additional electrodes.…”

Section: Introductionmentioning

confidence: 99%

Study on a Measuring Method of Permittivity Distribution of Functionally Graded Material

Ohchi¹,

Konno²,

Sugaya³

et al. 2014

IJEIC

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To improve the insulation performance of high voltage equipment, new functional materials of distributed permittivity, or the functionally graded materials (FGMs), have been developed. However, methods for measuring the permittivity distribution of these materials have yet to be established. In this study, numerical analyses have been conducted in order to investigate how the position of dielectrics in a cylindrical measurement device affects the capacitance and electric potential within the device. It has been confirmed that the capacitance and electric potential change with a varying position of the dielectrics. Therefore, it is suggested that the permittivity distribution of a given FGM can be estimated by measuring the capacitance and electric potential around it.

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分布誘電率推定のための長間隔測定電極を用いた静電容量計測における円弧形補助電極の影響

Cited by 5 publications

References 8 publications

Study on estimating electric potential in space between parallel electrodes

Study on estimating electric potential in space between parallel electrodes

Numerical electric field analysis of capacitance and potential in space for estimation of permittivity distribution

Study on a Measuring Method of Permittivity Distribution of Functionally Graded Material

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