GMM-FBG光纤电流传感器温度补偿研究

为解决因超磁致伸缩材料(GMM)磁致伸缩系数 对温度敏感而影响GMM-FBG光纤电流传 感器响应准确度的问题,研究了温度补偿的方法,构建了GMM磁场与温度的多场耦合模型, 进行温度传感实验、电流的通断实验、及不同磁场方向上的电流响应实验,设计了十字形传 感探头,利用垂直磁场方向的GMM的磁场不敏感性进行电流传感器的温度补偿,提高了GMM- F BG光纤电流传感器响应准确度。结果表明:垂直于磁场方向上的传感器中心波长值变化量为 ±0.05 pm,可忽略磁场的影响,温补后的拟合曲线与通断实验的拟 合曲线残差平方和为0.011,几乎完全重合, 可消除温度对GMM-FBG电流传感器的影响,使电流测量更加精确,并实 现电流与温度的同时测量,可满足当代电力系统的应用需求。

Study on temperature compensation of GMM-FBG fiber optic current sensor

To solve the problem because of the giant magnetostrictive material (G MM) magnetostrictive coefficient is sensitive to temperature and affect the accu racy of GMM-FBG optical fiber current sensor response problem,to study the tem p erature compensation method,constructed the GMM magnetic field and temperature field coupling model,the temperature sensing experiment,the current on and off ,and the different magnetic field direction on the current response of the expe riment,design the cross sensing probe,using GMM magnetic field is not sensitiv e to the direction of the vertical magnetic field current sensor temperature com pensation,and improve the accuracy of the GMM-FBG optical fiber current sensor response.The results show that the center wavelength in direction perpendicular to the magnetic field sensor value variation of plus or minus 0.05PM,but igno re the influence of magnetic field,after removing the fitting curve and on-off experiment fitting curve is the sum of squared residuals is 0.0112,almost compl etely overlap,can eliminate the influence of temperature on the GMM-FBG curren t sensor,make current measurement more accurate,and realize the electric curren t and temperature measurements at the same time,can meet the application requir ements of modern electric power system.