基于时分复用的多点式环形腔光纤电流传感器

Multipoint All-fiber Current Sensor Using a Fiber Loop Based on Time-division Multiplexing

为实现输电线路上的多点电流监测,利用通信用普通单模光纤,设计基于时分复用的多点式光纤环形腔结构电流传感器.多路传感系统共用一套光源、检测设备和数字信号处理系统,在节约成本的同时,提高了利用率.实验中选用双路全光纤电流传感器结构,在两个不同的点同时测量电流,其中一测量点对0~600A范围内的电流进行测量,另一测量点对0~1 500A范围内的电流进行测量.对实验数据进行线性拟合,结果表明:循环次数取8比较合适,此时系统具有比取2时高约3~4倍的灵敏度;两个测量点光信号的偏振态与电流之间有良好的线性关系,两个传感单元的灵敏度不同,而且相互之间没有串扰是各自独立的传感系统.

In order to realize multi-point current monitoring on power line,a multipoint all-fiber current sensor was described on the principle of time-division multiplexing using ordinary silica fibers and a fiber loop.The multi-channel sensor system was used to share a set of light source,detection equipment and digital signal processing system,which can improve the utilization rate while saving cost.In experiment,a dual-channel fiber current sensor structure was used to measure the current at the same time in the two different points.The direct current of a measurement point ranged from 0 A～600 Aand the direct current of another survey points ranged from 0 A～1 500 A.The experimental data is fitted with linear fitting.The results show that the suitable cycle number Kis 8 and the current sensitivity of K=8 was approximately 3 to 4 times as high as when K=2.The dual-channel fiber current sensor had good linear responses for both channels between the output signal ΔP and the current I.The channels are independently affected by the current,they require separate calibration.