摘要
为解决磁阻抗效应的偶次非线性问题,提出自平衡式传感信号检测方法。通过交流偏置磁场及检波处理,传感器的输出具有奇次特性,无需直流偏置就能反映磁场方向;再引入PI控制器构成闭环检测系统,系统达到稳态时反馈磁场与外磁场抵消,实现自平衡式检测,消除传感器的非线性。使用薄膜电感磁传感器进行实验验证,传感器自平衡检测方法输出呈良好的线性特性,非线性度仅为0.82%,有效测量范围扩大了一倍。在不同交流偏置下,输出特性仍保持高度一致,各输出间相关系数均在0.9999以上。交流偏置自平衡式检测适用任何非线性磁传感器,消除各种非线性特性得到高线性度的传感输出。
The magneto-impedance effect has the even-order nonlinearity.To solve this problem,a self-balanced detection method is proposed.By applying AC bias field and using phase sensitive detection,the output of sensor has the feature of odd symmetry.The direction of external field can be detected without DC bias.Then,a proportional-integral(PI)controller is utilized to form a closed-loop detection system.When the system reaches the steady state,the feedback field and the external field are counteracted with each other.And the self-balanced detection will be implemented.In this way,the nonlinearity of the sensor is eliminated.Experiments are implemented on a thin-film-inductive magnetic sensor.Results show that the output of the self-balanced detection method has good linearity,and the nonlinearity is only 0.82%.The measurement range is enlarged double.Even under different AC bias,the output characteristics is consistent and the correlation coefficients are all larger than 0.9999.The self-balanced detection with AC bias is suitable for all nonlinear magnetic sensors.Different kinds of nonlinear characteristic can be eliminated by the proposed method and the high-linear output can be achieved.
作者
郭大哲
文玉梅
李平
王遥
Guo Dazhe;Wen Yuniei;Li Ping;Wang Yao(School of Electronic Information and Electric Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2020年第4期24-31,共8页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(61527813)项目资助。
关键词
磁传感器
磁阻抗效应
偶次非线性
交流偏置
自平衡式检测
magnetic sensor
magneto-impedance effect
even-order nonlinearity
AC bias
self-balanced detection
作者简介
郭大哲,2015年于上海交通大学获得学士学位,现为上海交通大学硕士研究生,主要研究方向为磁传感器及其检测电路。E-mail:gdzhesh@yeah.net;文玉梅,1984于北京航空航天大学电子工程系获得学士学位,1987年于航天部第一研究院研究生院毕业获硕士学位,1997年于重庆大学获得博士学位。现为上海交通大学电子信息与电气工程学院教授,博士生导师。主要研究方向为信息获取与处理、传感器技术、测控仪器、能量采集。E-mail:yumei.wen@sjtu.edu.cn。
