实现线性测量的光学电压传感器设计
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摘要
设计了一种采用径向偏振光栅实现线性测量的光学电压传感器。将光学晶体的电光相位延迟角转化成环形光斑的同步旋转,由图像转换器将环形光斑转换为条形光斑,通过图像采集系统定位条形光斑暗纹的中心位置来获得被测电压值。应用琼斯矩阵证明了光斑暗纹中心位置与晶体电光相位延迟角之间的线性关系,给出了计算方法,并给出了锗酸铋(BGO)晶体和铌酸锂(LN)晶体的实验验证。结果表明该光学电压传感器的测量模式与光强无关,可直接测量172°的电光相位延迟角,测量误差小于0.5%,实现了对电压的线性测量。
An optical voltage sensor for voltage linear measurement using radial polarization grating is designed. The electro-optic phase delay in a crystal is converted into a synchronous rotation of a ring-shaped facula. The ring-shaped facula is changed into a stripe facula by an image converter, and then the applied voltage can be measured by positioning the dark stripe center with an image collecting system. The linear relation between the electro-optic phase delay and the position of the dark stripe center is proved using Jones matrix.The calculation method and the experimental verification of the bismuth germanium oxide( BGO) crystal and lithium niobate( LN)crystal are given. The results show that the measurement mode of the designed optical voltage sensor is irrelevant to the light intensity,and the measurable range of the electro-optic phase delay reaches 172°, while the linear measurement for voltage is realized with a measurement error less than 0. 5%.
An optical voltage sensor for voltage linear measurement using radial polarization grating is designed. The electro-optic phase delay in a crystal is converted into a synchronous rotation of a ring-shaped facula. The ring-shaped facula is changed into a stripe facula by an image converter, and then the applied voltage can be measured by positioning the dark stripe center with an image collecting system. The linear relation between the electro-optic phase delay and the position of the dark stripe center is proved using Jones matrix.The calculation method and the experimental verification of the bismuth germanium oxide( BGO) crystal and lithium niobate( LN)crystal are given. The results show that the measurement mode of the designed optical voltage sensor is irrelevant to the light intensity,and the measurable range of the electro-optic phase delay reaches 172°, while the linear measurement for voltage is realized with a measurement error less than 0. 5%.
引文
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[2]王晓琪,费烨.电力互感器[M].北京:中国电力出版社,2014.
[3]刘忠战,任稳柱.电子式互感器原理与应用[M].北京:中国电力出版社,2014.
[4]刘晔,王采堂,苏彦民,等.电力系统适用光学电流互感器的研究新进展[J].电力系统自动化,2000,24(17):60-64.LIU Ye,WANG Caitang,SU Yanmin,et al.New direction of study of optical current transducer used in power system[J].Automation of Electric Power Systems,2000,24(17):60-64.
[5]LI Changsheng,CUI Xiang,YOSHINO T.Measurement of AC electric power based on dual transverse Pockels effect[J].IEEE Trans on Instrumentation and Measurement,2001,50(5):1375-1380.
[6]NAWAF S F.Investigation the performance of electro-optical AC voltage Li Nb O3sensor based on Pockels effect[J].Tikrit Journal of Engineering Sciences,2013,20(7):32-37.
[7]温海燕,雷林绪,张朝阳.基于普克尔效应的双晶体互易型光学电压互感器[J].电测与仪表,2014,51(10):1-5.WEN Haiyan,LEI Linxu,ZHANG Chaoyang.A reciprocal optical voltage transformer with double-crystal based on Pockels effect[J].Electrical Measurement&Instrumentation,2014,51(10):1-5.
[8]刘延冰,李红斌,余春雨,等.电子式互感器原理、技术及应用[M].北京:科学出版社,2009.
[9]黄荔生,马善军,许灿华,等.光学电压互感器偏光干涉测量模式:(一)常见偏光干涉测量模式局限性分析[J].电力系统自动化,2014,38(2):97-114.DOI:10.7500/AEPS201301067.HUANG Lisheng,MA Shanjun,XU Canhua,et al.Polarization interference measuring mode of optical voltage transducer:Part one limitation analysis of polarization interference measuring mode[J].Automation of Electric Power Systems,2014,38(2):97-114.DOI:10.7500/AEPS201301067.
[10]谢榕芳,徐启峰,谢楠,等.一种改善光学电压互感器电光晶体内电场分布的方法[J].电力系统自动化,2016,40(6):91-95.DOI:10.7500/AEPS20150427006.XIE Rongfang,XU Qifeng,XIE Nan,et al.A method for improving electric field distribution of OVT’s electro-optical crystal[J].Automation of Electric Power Systems,2016,40(6):91-95.DOI:10.7500/AEPS20150427006.
[11]罗苏南,叶妙元,徐雁.光纤电压互感器稳定性分析[J].中国电机工程学报,2000,20(12):16-20.LUO Sunan,YE Miaoyuan,XU Yan.Stability research on optical fiber voltage transformer[J].Proceedings of the CSEE,2000,20(12):16-20.
[12]FENG Pan,XIA Xiao,YAN Xu,et al.Optical AC voltage sensor based on two Bi4Ge3O12crystals[J].IEEE Trans on Instrumentation and Measurement,2012,61(4):1125-1129
[13]XU Canhua,XU Qifeng.Research on characteristics of axially symmetric polarized beams with a nanometer sub-wavelength metal grating[J].Applied Physics Express,2013,6(3):462-465.
[14]林凯燕,许婕,王红成,等.单轴晶体电光调制器的温度特性[J].中国激光,2006,33(8):1051-1055.LIN Kaiyan,XU Jie,WANG Hongcheng,et al.Temperature properties of uniaxial crystal electro-optic modulator[J].Chinese Journal of Lasers,2006,33(8):1051-1055.