基于光纤反射腔的高灵敏电流传感器方案

A Scenario of High Sensitivity Current Sensor Based on Optical Fiber Reflection Cavity

提出了一种基于平面Y分支波导与法拉第旋镜的高灵敏度光纤电流传感器结构方案。利用两个法拉第旋镜与平面Y分支波导构成一个光纤反射腔,通过光在腔中的多次反射来增加待测电流导致的传感光纤中的法拉第相移,从而实现对微弱电流的测量。该结构方案中首次采用了平面Y分支光波导,从而可降低光路系统损耗,增加灵敏度,为微弱电流测量的工程化提供了一种可行的方法。

In this paper, a configuration scenario of high sensitivity optical fiber current sensor based upon planar Y-branch optical waveguide and Faraday rotation mirror is proposed. An optical fiber reflection cavity is formed by utilizing a planar Y- branch optical waveguide and two Faraday rotation mirrors so that the optical signals which travel along the fiber sensing coil can experience multiple reflections. As a result, the Faraday phase shift which is induced in the fiber sensing coil by the cur- rent is increased. Therefore, a measurement for weak current can be realized. A planar Y-branch optical waveguide are used firstly in this configuration, which can decrease the optical losses and increase sensitivity of the system, and at last, provides a feasible measuring method for the weak current.