基于微纳光纤Sagnac环结构的光学电流传感器的响应特性研究

磁流体具有固体物质磁性及液体流动性的特性,且无本征矫顽力,无剩磁,磁场响应速度快,灵敏度高,将微纳光纤Sagnac环特殊的光传输性能与磁流体独特的磁光特性相结合,提出了一种基于磁流体包覆微纳光纤Sagnac环的全光纤电流传感器.理论推导了传感器的电流传感机理,设计了传感器的封装方法,并对传感器的温度特性和传感特性进行了...

Research on Response Characteristics of Optical Current Sensor Based on Microfiber Sagnac Loop Structure

Magnetic fluid has the properties of magnetism of solid matter and fluidity of liquid,and has no intrinsic coercive force,no remanence,fast response to magnetic field and high sensitivity.A optical current sensor was achieved based on magnetic-fluid coated microfiber Sagnac loop by the combination of the special optical transmission properties of microfiber Sagnac loop and the unique magnetic and optical properties of magnetic fluid.The mechanism of current sensing was theoretically deduced,the packaging method of the sensor was designed,and the temperature characteristics and sensing characteristics of the sensor were experimentally studied.The experimental results show that the sensitivity of temperature response is about 3 pm/℃,the sensitivity of current response is 0.00218 V/A,the linear correlation coefficient of current response is 0.9979.Compared with the traditional optical fiber current sensor,it has the advantages of simple fabrication process,small size,high temperature stability,low transmission loss and easy coupling with optical fiber devices.