Measurement Method for AC Surface Discharge Distribution and its Charge Density on PET Film using Pockels Cell

Kawasaki, Toshiyuki; Terashima, T.; Suzuki, Shohgo; Takada, Tatsuo

doi:10.1541/ieejfms1990.112.11_938

Cited by 8 publications

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“…However, the limited existence of the Pockels effect in crystalline materials has limited its use as an optical voltage sensor or for sensing the electric field within a discharging air gap [73,92,93]. Recently, it was employed for investigating surface discharge phenomena [97][98][99][100][101][102][103][104]. The Kerr effect also may exist in some solid materials such as polymethyl methacrylate (PMMA).…”

Section: Optical Methodsmentioning

confidence: 99%

Acoustic and optical methods for measuring electric charge distributions in dielectrics

Takada¹

1999

IEEE Trans. Dielect. Electr. Insul.

203

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Much progress had been made during the last two decades in acoustic and optical methods for measuring charge distributions in dielectrics. A review on this topic is given, which mainly covers the past research activities associated with that at our laboratory. For acoustic methods, we will discuss and compare the pulsed electroacoustic (PEA) and pressure wave propagation (pwP) methods and present some of the results that enabled us to gain physical insights into the charge dynamics within solid plate samples and coaxial cables. For optical methods, we will discuss the Pockels effect technique that is used for the dynamic measurement of surface charge distributions, and the Kerr effect technique that is developed for measuring electric field distributions within liquid dielectrics. 1 INTRODUCTION T HE Poynting vector represents a flow of electric power equivalent to EXH [W 1m2], where E [V 1m] represents electric field inten sity and H [Aim] the magnetic field intensity. To facilitate the transmission of large amounts of electric energy, which has its equivalent in a large Poynting vector, researchers must strive to increase either the magnetic field jj or the electric field E. An increase of H can be ac complished by using superconducting transmission lines, while that of if can be achieved by increasing the transmission voltage. However, at present, the development of a practical, usable superconducting trans mission system has not been fully realized. Therefore, we have to con tinue our efforts in obtaining high E through a HV transmission system.. To this end, much research on the properties of dielectric and insulating materials will have to be conducted. This is one of the goals of the present workThe advancement of excellent electric insulating materials, in which electric power flows in the form of a Poynting vector, has made a sig nificant contribution to the development of electric power engineer ing, electronics engineering and electronic communication systems in present everyday life, Many researches have been conducted on de voltage-current characteristics by electric conductivity (r; [S/m]) mea surement, and on ac voltage�current characteristics by permittivity (c [F/m]) measurement in the past years. However, that research con sidered only the case where the current flowing through the materials had reached the steady state and the electric field across thematerial was uniform and independent of time.During the last 20 years, because electric power apparatus has be· come more compact, and electronic devices have become much smaller, the insulating materials used are highly stressed to > 1 MV I cm, which is near the breakdown strength of the insulating materials. Under such high electric field application, electric charges may be injected fromelec trodes or be dissociated from impurities that occur in the material. These electric charges accumulated in the insulating material distort the orig· inal internal electric field distribution. The process may cause the insu lating material to degrade and som...

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Section: Optical Methodsmentioning

confidence: 99%

Acoustic and optical methods for measuring electric charge distributions in dielectrics

Takada¹

1999

IEEE Trans. Dielect. Electr. Insul.

203

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“…In addition, surface potential sensors using the Pockels effect have been developed with a spatial resolution of 2 mm. [23][24][25] To achieve a high spatial resolution using these techniques, it is necessary to narrow the sensing area and scan the whole surface point by point; 26) this is a timeconsuming process. To measure the surface potential distribution in a short duration, a surface potential measurement technology using electric fields induced by ultrasound waves has been developed.…”

Section: Introductionmentioning

confidence: 99%

Characterization of electrical conductivity of carbon fiber reinforced plastic using surface potential distribution

Kikunaga

Terasaki

2018

Jpn. J. Appl. Phys.

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A new method of evaluating electrical conductivity in a structural material such as carbon fiber reinforced plastic (CFRP) using surface potential is proposed. After the CFRP was charged by corona discharge, the surface potential distribution was measured by scanning a vibrating linear array sensor along the object surface with a high spatial resolution over a short duration. A correlation between the weave pattern of the CFRP and the surface potential distribution was observed. This result indicates that it is possible to evaluate the electrical conductivity of a material comprising conducting and insulating regions.

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Kawasaki¹,

Terashima²,

Zhu³

et al. 1994

J. Phys. D: Appl. Phys.

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A visualization and a quantification technique for a latent electric charge image on a dielectric material has been developed by using the Pockels effect and a computer imaging technique. An optical phase modulation technique and a computer image lock-in amplifier technique were used to improve the signal-to-noise ratio. The measurement system has several improved performances; sensitivity of surface change of 1 nC cm-2, spatial resolution of 200 mu m and discrimination of charge polarity. The basic principle of advanced electro-optic surface charge measurement is described and the typical surface charge distribution of positive discharge streamer produced by a high impulse voltage (5 kVpeak) is demonstrated. Also, comparison is made between the modulation method and the non-modulation method.

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Measurement Method for AC Surface Discharge Distribution and its Charge Density on PET Film using Pockels Cell

Cited by 8 publications

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Acoustic and optical methods for measuring electric charge distributions in dielectrics

Acoustic and optical methods for measuring electric charge distributions in dielectrics

Characterization of electrical conductivity of carbon fiber reinforced plastic using surface potential distribution

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