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Proceedings Paper

Development of the optical instrument transformer for DC voltage measurement
Author(s): Pingping Zhu; Guixin Zhang
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Paper Abstract

The optical instruments based on the Pockels effect for DC voltage measurement show great advantages in comparison with the traditional type voltage transformers, but the development is impeded due to the presence of the space charge and the charge drift effect in DC voltage measurement. In this paper, the author will analyze the reason of the space drift phenomena and the errors to the measurement accuracy. A method using the octagonal LiNbO3 crystal with a polyurethane ring with &Vegr;r=3.4 to suppress the space charge is proposed in the paper. A better result of the electrical field distribution is obtained from the simulation with the ANSOFT software. It can improve the measurement accuracy and sensitivity. At the same time, a new method in which the chopped DC voltage applied to the crystal is also introduced. It can suppress the charge drift effectively with the appropriate frequency. We will show the theoretical analysis and simulation result, and can find the new method can provide a better result, the new instruments are to be more stable and accurate.

Paper Details

Date Published: 5 March 2007
PDF: 6 pages
Proc. SPIE 6595, Fundamental Problems of Optoelectronics and Microelectronics III, 65953V (5 March 2007); doi: 10.1117/12.726486
Show Author Affiliations
Pingping Zhu, Tsinghua Univ. (China)
Guixin Zhang, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 6595:
Fundamental Problems of Optoelectronics and Microelectronics III

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