To achieve linear measurement of electro-optic phase delay and improve the accuracy and measurement range of the optical voltage transducer (OVT), this paper proposes a linear phase delay detection method for an optical voltage transformer based on a strip S-wave plate. Using the strip S-wave plate, the phase delay can be directly converted into the displacement of the dark stripe of the strip spot, and the displacement is located by the dual-quadrant detector. Using the Jones matrix, we confirm the linear relationship between the position of the dark stripe and the phase delay, and propose a positioning method and error compensation scheme of the dark stripe and set up an experimental system to verify its performance. The experimental results show that the OVT realizes the measurement of the electro-optic phase delay; the measuring range of the phase delay is up to 40, and the measurement error is less than 0.5%.

为实现电光相位延迟的线性测量，提高光电压传感器(OVT)的精度和测量范围，提出一种基于条形S波片的光电压互感器线性相位延迟检测方法。使用条状S波片，相位延迟可以直接转化为条状光斑暗条的位移，位移由双象限探测器定位。利用琼斯矩阵，确定了暗条纹位置与相位延迟的线性关系，提出了暗条纹的定位方法和误差补偿方案，并搭建了实验系统对其性能进行了验证。实验结果表明，OVT实现了电光相位延迟的测量；