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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。
Optical fiber 1/4 wave plate is a key component of all-fiber current transformer (FOCT). To reduce the influence of fiber-optic wave plate to transformer ratio under changing temperature environment, the phase retardation of wave plate with temperature needs to be more accurately tested. Based on the light intensity measurement method, a method for measuring the phase delay temperature characteristic of an optical fiber quarter wave plate is proposed. Based on the Jones matrix, a mathematical model of the test system is established and the temperature performance of the wave plate is tested. The experimental results show that the phase retardation of the ¼ wave plate of the elliptical fiber has a linear relationship with the temperature and the temperature coefficient of the phase retardation of the ¼ wave plate in the domestic fiber is much larger than the temperature coefficient of the corresponding wave plate . The method is applied to FOCT variable temperature error self-compensation technology. The variation ratio error of transformer is within ± 0.2% within the range of -40 ℃ ~ 60 ℃. In addition, the smaller the temperature coefficient of the phase delay of the quarter-wave plate of the optical fiber, the higher the self-compensation limit accuracy of the transformer ratio temperature error is, and the larger the initial value selectable range is.