叠堆型压电陶瓷FBG电流传感器

大电流的实时测量是电力系统稳定、安全、可靠和经济运行的重要保证。该文研制了电流互感器和叠堆型压电陶瓷等元件结合的光纤Bragg光栅电流传感器。传感器通过电流互感器将被测大电流转换成直流低电压信号加载到叠堆型压电陶瓷上,在逆压电效应下,叠堆型压电陶瓷发生伸缩变化,带动粘贴在其上面的测量用光纤Bragg光栅发生形变,检测出测量用光纤Bragg光栅和温度补偿光纤Bragg光栅的波长移位,计算出波长位移之差即可反算出被测一次大电流。测试结果表明,此电流传感器的非线性误差为7.27%FS(满量程),灵敏度为0.056 7pm/A,重复性为7.69%FS。

An FBG Current Sensor Based on Stack Piezoelectric Ceramic

The real time measurement of high current is an important guarantee of stable,secure,reliable and economical operation of the power system. An fiber Bragg grating (FBG0 current sensor is developed, which is mainly composed of current transformer and stack piezoelectric ceramic. The sensor transforms the measured high current through the current transformer into low DC voltage signal to load on the stack piezoelectric ceramic. Under the action of the inverse piezoelectric effect, the stack piezoelectric ceramic generates expansion and contraction, causing the fiber Bragg grating pasted on it to be deformed. By detecting the wavelength shifting of the measuring FBG and temperature compensating FBG, the value of high current can be measured by calculating the displacement difference of wavelength. The test results show that the nonlinear error of the current sensor is 7.27%FS (full scale), sensitivity is 0.056 7 pm/A, repeatability is 7.69%FS.