全光纤电流互感器灵敏度特性研究

Research on sensitivity characteristic of fiber optic current transformer

在全光纤电流互感器理想数学模型基础上,建立了全光纤电流互感器灵敏度特性数学模型,该模型揭示了单位长度线性双折射、传感环半径和光纤缠绕匝数是影响全光纤电流互感器灵敏度的3个主要因素,并得出结论:最优光纤长度时全光纤电流互感器灵敏度最高,且最优光纤长度只与单位长度线性双折射有关;全光纤电流互感器灵敏度随着光纤缠绕匝数增多而增大,且增大到最优光纤缠绕匝数时,全光纤电流互感器灵敏度最高。进而提出利用有效匝数来平衡灵敏度和光纤利用率。实验验证了理论分析结果的正确性。

A sensitivity characteristic model of FOCT（Fiber Optic Current Transformer） is established based on its ideal mathematical model,which reveals that,its three main influencing factors are linear-birefringence per unit length,coil radius and fiber turns;the optimal fiber length with the highest sensitivity is only relevant to the linear-birefringence per unit length;its sensitivity increases along with the increase of fiber turns and reaches the highest at the optimal fiber turns. It is proposed that,the effective turns can be applied to keep the balance between sensitivity and correctness of theoretical analysis. fiber utilization rate. The experimental results prove the