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提出了一种新的Sagnac干涉型光纤电流传感器结构。利用Faraday效应的非互易性,采用一个3×3光纤耦合器实现相位偏置。利用散射矩阵分析了耦合器的输出特性,建立了干涉仪输出信号的数学模型,对耦合器性能对干涉仪灵敏度的影响进行了理论分析,得到了耦合器的最佳耦合比。
A new structure of Sagnac interferometer fiber current sensor is proposed. Using the non-reciprocity of the Faraday effect, a 3 × 3 fiber coupler is used to achieve phase offset. The output characteristic of the coupler is analyzed by using the scattering matrix. The mathematical model of the output signal of the interferometer is established. The influence of the coupler ’s performance on the sensitivity of the interferometer is analyzed theoretically, and the optimal coupling ratio of the coupler is obtained.