Magnetic sensors based on tunneling magnetoresistance(TMR)effect exhibit high sensitivity,small size,and low power consumption.They have gained a lot of attention and have potential applications in various domains.Thi...Magnetic sensors based on tunneling magnetoresistance(TMR)effect exhibit high sensitivity,small size,and low power consumption.They have gained a lot of attention and have potential applications in various domains.This study first introduces the development history and basic principles of TMR sensors.Then,a comprehensive description of TMR sensors linearization and Wheatstone bridge configuration is presented.Two key performance parameters,the field sensitivity and noise mechanisms,are considered.Finally,the emerging applications of TMR sensors are discussed.展开更多
文摘精确电流值的测量是电网精益化运行决策的重要前提,高灵敏度、高精度TMR电流传感器的提出有效提升了电流测量能力.与此同时需要重点考虑温度漂移以及空间地磁场在TMR电流传感器测量过程中的影响.针对该问题,本文提出了基于改进深度信念网络的TMR电流传感器温漂与地磁场校正方法.首先,针对TMR电流传感器由于受到强磁场干扰或故障下的异常输出数据,利用贝叶斯结合信息熵理论识别并剔除;其次,使用改进深度信念网络重构空间地磁场、温度与TMR电流传感器测量输出的映射关系;最后,本文对所研发的TMR电流传感器进行了标定实验和误差分析.实验结果表明,在-40~80℃的温度变化范围内,算法补偿后的温度漂移系数由900×10^(-6)/℃降至32.33×10^(-6)/℃.TMR电流传感器对地磁场的敏感程度明显降低,平均绝对百分比误差由2.1530%降低到0.4109%,均方根误差由0.1048 A降低为0.0200 A.
基金financially supported by Beijing Municipal Science and Technology Project(No.Z201100004220002)the International Collaboration Project B16001+1 种基金the Key Research and Development Program of Shandong Province of China(No.2020S020201-01621)the Magnetic Sensor Innovation Platform from Laoshan District。
文摘Magnetic sensors based on tunneling magnetoresistance(TMR)effect exhibit high sensitivity,small size,and low power consumption.They have gained a lot of attention and have potential applications in various domains.This study first introduces the development history and basic principles of TMR sensors.Then,a comprehensive description of TMR sensors linearization and Wheatstone bridge configuration is presented.Two key performance parameters,the field sensitivity and noise mechanisms,are considered.Finally,the emerging applications of TMR sensors are discussed.
