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韦尔代常数(Verdet)是决定光纤电流传感器(FOCT)灵敏度的重要因素之一。根据萨格纳克(Sagnac)干涉原理计算得到校准信号,并测量FOCT的实际输出信号,通过比较这两组信号建立目标函数,基于单纯形算法进行参数优化,从而得到石英光纤的韦尔代常数。实验结果与经典模型计算结果基本吻合。FOCT的输出信号经过测量电路会引入相位差;另外受到调制器和外界环境的影响,干涉回路的工作点会产生漂移,导致输出信号不对称而产生直流量。考虑到以上因素,提出的这种方法还能同时测量出电路的相位差、干涉回路的工作点以及反映非线性畸变的直流量。
Verdet is one of the important factors that determine the sensitivity of a fiber-optic current sensor (FOCT). According to the Sagnac principle, the calibration signal is calculated and the actual output signal of FOCT is measured. By comparing these two signals, an objective function is established and the parameters are optimized based on the simplex algorithm. The Verdet constant . The experimental results are basically consistent with the classical model. FOCT output signal through the measurement circuit will be introduced into the phase difference; the other by the modulator and the external environment, the interference point of the operating point will drift, resulting in the output signal asymmetry and generate direct current. Considering the above factors, the proposed method can simultaneously measure the phase difference of the circuit, the operating point of the interference circuit and the direct current quantity that reflects the nonlinear distortion.