Effect of electric field interference on performance of optical voltage transducers

ZHAO Yinan; GUO Zhizhong

doi:10.7510/jgjs.issn.1001-3806.2015.06.008

In order to investigate effect of electric field interference on the properties of an optical voltage transducer with longitudinal modulation structure, using tensor analysis method and based on the relative inverse dielectric tensor of the electro-optic crystal, simulation analysis and experimental verification were carried out. According to experimental result of light separation, an optical electric field sensor was designed. The magnitude error of sensor was within 2%. The results show that light separation will occur in two transmitting normal modes of electro-optical crystal while electric field interference exists, which makes that the two polarized beams can not interfere effectively in the analyzer and which leads to a smaller output signal. The error caused by interference efficiency of KDP crystal can reached 0.3% when interference voltage was 500V and spot radius was 0.2mm. When interference field intensity is less than 105V/m, interference efficiency of Bi4Ge3O12(BGO) crystal is close to 1. The transducer error caused by electric field interference has the relationship not only with the magnitude of electric interference but also with the beam radius and the length of sensing crystal. The influence of interference electric field can be reduced effectively by selecting the light source with larger beam radius and the sensing crystal with smaller length. The research can provide the guidance for the design of optical voltage transducers.

Effect of electric field interference on performance of optical voltage transducers

Corresponding author: GUO Zhizhong, zhizhongzz@sina.com.cn

1. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Received Date: 2014-08-12

Accepted Date: 2014-09-18

Available Online: 2015-11-25

Abstract: In order to investigate effect of electric field interference on the properties of an optical voltage transducer with longitudinal modulation structure, using tensor analysis method and based on the relative inverse dielectric tensor of the electro-optic crystal, simulation analysis and experimental verification were carried out. According to experimental result of light separation, an optical electric field sensor was designed. The magnitude error of sensor was within 2%. The results show that light separation will occur in two transmitting normal modes of electro-optical crystal while electric field interference exists, which makes that the two polarized beams can not interfere effectively in the analyzer and which leads to a smaller output signal. The error caused by interference efficiency of KDP crystal can reached 0.3% when interference voltage was 500V and spot radius was 0.2mm. When interference field intensity is less than 105V/m, interference efficiency of Bi4Ge3O12(BGO) crystal is close to 1. The transducer error caused by electric field interference has the relationship not only with the magnitude of electric interference but also with the beam radius and the length of sensing crystal. The influence of interference electric field can be reduced effectively by selecting the light source with larger beam radius and the sensing crystal with smaller length. The research can provide the guidance for the design of optical voltage transducers.

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Reference (15)

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Effect of electric field interference on performance of optical voltage transducers

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