基于椭圆芯保偏光纤模间干涉的光学电压互感器  

Optical Voltage Transducer Based on Modular Interference in Highly Elliptical-Core Polarization-Maintaining Fiber

作　　者：刘丰[1] 毕卫红[1] 郭璇[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《光学学报》2009年第1期219-223,共5页Acta Optica Sinica

基　　金：国家自然科学基金(50477001)资助课题

摘　　要：设计了一种基于椭圆芯保偏光纤模间干涉的光纤电压互感器,能对温度等环境干扰信号进行自动温度补偿。用缠绕了椭圆芯保偏光纤的石英晶体作为电压传感头,在被测高压电场的作用下,保偏光纤的长度因石英晶体的逆压电效应形变而受到调制,进而改变模间干涉输出两个边瓣的光强分布,对两个干涉输出边瓣进行探测实现高电压的测量。在地面低压端用一个缠绕了保偏光纤的压电陶瓷(PZT)实现模间静态相位差的实时调整,以补偿环境温度变化带来的静态工作点漂移。实验结果表明,高压电压互感器在额定电压附近能获得0.5%的测量精度,在被测电压超过10 kV时具有很好的线性度。An optical voltage transducer （OVT） for the electric power system based on modular interference in dualmode highly elliptical-core polarization maintenance fiber （E-core PMF） is designed, and the temperature and environmental perturbation can be compensated automatically. A quartz crystal cylinder wrapped with highly elliptical-core fiber plays the role of voltage sensor head. The two interference output lobes＇ intensity from the E-core PMF is modulated with the converse piezoelectric effect of quartz crystal. A PZT wrapped with E-core PMF at ground potential serves as the static modular phase difference control and temperature compensation unit. The experimental results show that the measurement precision of is 0.5 % near by rated voltage, and the OVT has a good linearity when measured voltage is greater than 10 kV.

关 键 词：光学测量 光学电压互感器 模间干涉 石英晶体 逆压电效应 温度补偿 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]