光纤电流传感器偏转角及线性双折射研究

Study on Deflection Angle and Linear Birefringence of Fiber- optic Current Sensor

光纤电流传感器中由于光纤的弯曲以及自身特性,会同时存在线性双折射和法拉第效应,致使法拉第效应的偏转角无法被准确测量出来,这是造成光纤电流传感系统测量误差的一个重要因素。利用MATLAB模拟了线偏振光转化为圆偏振光和椭圆偏振光以及法拉第效应,并对法拉第效应中左右旋圆偏振光相位差设定了不同参数,利用MATLAB得出最终合成的线偏振光,观察其偏转角为所设左右旋圆偏振光相位差的1/2,之后进行了理论推导,验证了上述结论,为后续的线性双折射补偿研究奠定良好的基础。

Due to fiber bending and itself characteristics of fiber - optic current sensor, linear birefringence and Faraday Effect exist, which result in the result that angle of Faraday Effect can＇ t be measured accurately, which is one of the important factors causing the measurement error of optical fiber current sensor system. MATLAB was used to simulate the linear polarized into circularly polarized light and elliptically polarized light and Faraday effect. By setting different parameters to left and right spin polarized light phase difference of Faraday Effect, the final synthesis of linear polarized light is obtained by MATLAB. The results showed that its deflection angle is about 1/2 of left and right spins polarized light phase difference, which is proved by theoretical derivation, so that it can provide good foundation for future linear birefringence compensation research.