光纤1/4波片是全光纤电流互感器(FOCT)的关键器件，为减小变温环境下光纤波片对互感器变比的影响，需要更精确地测试波片相位延迟随温度变化规律。基于光强测量法提出了一种适用于光纤1/4波片的相位延迟温度特性测量方法，借助琼斯矩阵，建立了测试系统的数学模型，并对波片的温度性能进行了实际测试。实验结果表明:椭芯光纤1/4波片的相位延迟与温度之间呈负系数的线性关系，且国内光纤1/4波片相位延迟温度系数远大于国外相关研究单位对应波片的温度系数。将该方法应用于FOCT变比温度误差自补偿技术，在-40 ℃~60 ℃范围内，互感器的变比误差在±0.2%以内。另外，光纤1/4波片相位延迟的温度系数越小，互感器变比温度误差的自补偿极限精度越高，初值可选范围越大。

The fiber quarter-wave plates are an important part of fiber-optic current transformers (FOCT). In order to decrease the error caused by the quarter-wave plates on the ratio under the varying temperature environments, more accurate relationship between the temperature and the phase delay of fiber quarter-wave plates is required. Based on the intensity method, a measuring way of the temperature dependence of the phase delay of quarter-wave plates is put forward. It is applied to measure fiber quarter-wave plates in real time and continuously. A mathematical model of the test systems is established by using Jones matrix, and the temperature characteristics of the quarter-wave retarder are tested. The experimental results show that: the relationship between the temperature and the phase delay is linear, and the temperature coefficient of inland quarter-wave plates is much larger than that of the abroad ones; in the temperature self compensation technology of ratio error of FOCT, the smaller the temperature coefficient of the phase delay of quarter-wave plates is, the higher the self compensation limit precision is and the wider the original phase retardation is.