一种环形结构单光路检测型光纤电流传感器

A Fiber Current Sensor Based on Single Light Path Detection and Loop Scheme

针对传统单光路检测型光纤电流传感器电流灵敏度低的缺点,提出一种新颖的环形结构单光路检测型光纤电流传感器。该光纤电流传感器利用单偏振单模耦合器构建光纤环形腔结构,取代了传统单光路检测型光纤电流传感器中的起偏器和检偏器。这一设计不仅保留了单光路检测型光纤电流传感器所具有的结构简单、成本低廉等优点,还具备环形腔结构光纤电流传感器可实现传感信息的多次循环放大的特点,提高了系统的电流灵敏度。理论分析与实验表明,这种光纤电流传感器的电流灵敏度可随循环次数K的增加而增加,设计具备可行性。

We propose a novel fiber current sensor based on single light path detection and fiber loop scheme in order to solve the problem of low current sensitivity of traditional single light path detection fiber current sensors. Fiber loop scheme of this fiber current sensor is built by single-polarization single-mode couplers, which replaces the polarizer and the analyzer in traditional single light path detection fiber current sensors. This design not only keeps the advantages of simple structure and low cost, but also improves the current sensitivity of fiber current sensor via repeated cycle amplification, which inherits from the loop scheme. Both theory and experiment show that the system current sensitivity increases with cycle number K and the new fiber current sensor is feasible.