具有闭环系统的法拉第电流传感器

Faraday Effect Current Sensor in a Closed-Loop Mode

利用法拉第效应建立了一种偏振结构的电流传感器，它具有闭环反馈系统，从输出端反馈的电流信号驱动偏振调制螺线管产生补偿信号使传感器工作在正交状态，这样就有效地消除了费德尔常数变化给传感器带来的误差．该传感器线性测量范围是：1mA～6．5A。

A novel fiber-optic polarimetric configuration for a currert sensorutilizing the Faraday effeet is described. The spstem is operated in a closed-loopmode. Magneto optic feedback through a simple current driven solenoid maintainsthe sensor onto the quadrature condition. In this mode of operation sensor errorsdue to changes in the Verdet constant of the fiber are effectively eliminated. Ameasurement range with linear operation is from 1 mA to 6.5 A.