介绍了一种用于测量工频电压的以Y切Z传钛扩散LiNbO3基底直波导作为敏感元件的光学电压传感器，直波导电压传感器利用Pockels效应，将直波导的固有相位差调整至接近[π2]，在不需要加1/4波片的条件下实现工频电压的线性传感。利用直波导可以直接耦合进光纤的特性，全部器件采用光纤连接，大大减少了光路空间，提高了光路的稳定性。分析了这种电压传感器的工作原理与输入输出特性，并对100~3000 V的工频电压进行了测量。初步研究了其温度特性，在-40 ℃~60 ℃的温度范围内，变比误差达到5.29%。根据理论与测量分析，这种电压传感器可以用于工频高电压的测量。

A straight waveguide optical voltage sensor for measurement of power frequency voltage based on Y-cut LiNbO3 waveguide is proposed. Using the Pockels effect of LiNbO3 crystal and adjusting the optical bias to [π2], linear result can be achieved. Making use of the waveguide′s distinguishing feature that optical fiber can couple with waveguide directly, all optical devices are connected with optical fiber so that the optical path is simplified. Both the sensor′s principles and the output/input characteristics are analyzed. The power frequency voltage in the range of 100~3000 V is measured by using this sensor. The temperature dependence is researched preliminarily, and in the range of -40 ℃~60 ℃, transformer ratio is 5.29%. The measurement results show that this kind of voltage sensor is suitable for measurements of high frequency voltage.