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基于磁致伸缩效应,利用Fabry-Perot干涉仪原理,设计了一种光纤电流传感器。该传感器用一根单模光纤既作传感光纤又作参考光纤,从而有效地消除了环境变化和光纤内双折射对传感器的不良影响。文中从理论上分析了传感器的工作原理,推导了数学模型,并用实验进行了验证。由实验可知,此传感器具有抗干扰能力强、稳定性好,精度高等优点。在1～120mA的测量范围内,精度可达0.20％。
Based on the magnetostriction effect, a fiber optic current sensor is designed by using the Fabry-Perot interferometer principle. The sensor uses a single-mode fiber as both a sensing fiber and a reference fiber, thus effectively eliminating the adverse effects of environmental changes and intra-fiber birefringence on the sensor. In this paper, the working principle of the sensor is analyzed theoretically, the mathematical model is deduced, and the experiment is validated. The experiment shows that this sensor has strong anti-interference ability, good stability, high accuracy. In the 1 ~ 120mA measurement range, the accuracy of up to 0.20%.