A new kerr electro-optic system for the measurements of electric field and space charge distribution

Peng, Zongren; Xie, Hengkun; Zhang, Cuiying

doi:10.1109/icpadm.1994.414100

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…The isoclinic fringes shown in Figure 3a and Figure 3b can be removed [21,24] (Figure 3c) if crossed λ/4 wave plates are placed on either side of the Kerr cell as shown in the optical path of Figure 1. Let the first λ/4 wave plate axis be at an angle of 45° to either of the polarizer or the analyzer, with the second λ/4 wave plate axis perpendicular to the first.…”

Section: Circular Polariscopementioning

confidence: 99%

“…The space charge distribution between electrodes shown in Figure 11 can be acquired from the electric field distribution from equation (21) and Figure 10. In order to verify the correctness of our calculation results, the potential distributions between parallel plate electrodes at different times are calculated, shown in Figure 12.…”

Section: Electric Field and Space Charge Distributionsmentioning

confidence: 99%

“…According to equation (21), the one-dimensional slope of the electric field distribution E is proportional to the net charge density. For bipolar homocharge injection, the electric field decreases at both charge injection electrodes.…”

Section: Space Charge Dynamicsmentioning

confidence: 99%

“…The measurement system has two main methods, namely, one based on a photodetector and another on line patterns of light maxima and minima measured by a charge-coupled device (CCD). The Kerr measurement system based on a photodetector is used in [13], while the Kerr electro-optic measurement based on line patterns is used to measure space charge distributions in liquids under a DC field, AC field, and pulsed voltage [18][19][20][21]. The Kerr measurement system using a CCD [22] can record fringe patterns that contain dynamic information about the electric field and space charge distribution.…”

Section: Introductionmentioning

confidence: 99%

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Space charge dynamics investigation based on Kerr electro-optic measurements and processing of CCD images

Shi

Yang

Sima

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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The Kerr electro-optic technique is used to investigate electric field and space charge effects using large Kerr constant propylene carbonate as the dielectric liquid with Kerr constant B≈1.22×10 -12 m/V 2 . However, improved accuracy of this technique to measure space charge distributions remains an important goal. This paper describes inversion algorithm research on obtaining accurate space charge distributions from Kerr measurements. The original charge-coupled device (CCD) image of light intensity was converted into grayscale values for improved calculation. The grayscale CCD image was transformed into the frequency domain through a two-dimensional Fourier transformation. Butterworth filtering techniques were employed for edge enhancement algorithms. The most important parameter for calculation of space charge distributions are the integer fringe numbers n in the sequence of light and dark fringes measured by the CCD camera. Comparison of the improved algorithm and traditional methods for calculating electric field and space charge distributions between a pair of stainless steel parallel plate electrodes was investigated. The space charge dynamics were also calculated after processing the CCD images with some improvements. The results showed the electric field was essentially uniform at early times of pulsed high voltages. This uniformity indicated the absence of space charge during the early transient interval, while a bipolar charge injection was found in the central region between electrodes at later times. For longer times the electric field and space charge distributions slowly became uniform again. Grayscale processing and Butterworth filtering played an important role in the improvement of the algorithm for better image quality and edge enhancement.

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Section: Circular Polariscopementioning

confidence: 99%

Section: Electric Field and Space Charge Distributionsmentioning

confidence: 99%

Section: Space Charge Dynamicsmentioning

confidence: 99%