基于改进巨磁电阻芯片的三维地磁传感器设计  

Design of 3D geomagnetic sensor based on improved giant magnetoresistance chip

作　　者：王晓飞[1] 韩焱[1,2] 李凯[1,2] 

机构地区：[1]中北大学信息探测与处理技术研究所,山西太原030051 [2]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《磁性材料及器件》2014年第4期28-30,49,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(61227003);国家973计划资助项目(2011CB311804)

摘　　要：介绍了一种新型三维地磁传感器的结构以及原理,利用巨磁电阻(GMR)传感器实现地磁三分量测量。由于常规GMR传感器的输出特性不满足地磁场的测量,通过外置磁通聚集器和磁偏置技术改进巨磁电阻传感器的输出特性。使用高磁导率材料制作磁通聚集器,由永磁体提供偏置磁场。并用ANSYS对改进后的传感器模型进行数值模拟,ANSYS能快速地确定出偏置场的相关参数。使用无磁转台对三维地磁传感器标定测试,结果表明该传感器能较好地描述地磁信号,具有体积小、功耗低、灵敏度高等优点。A new structure and principle of 3D geomagnetic sensor is introduced, applying giant magneto resistance （GMR） sensors for measurement of triaxial component of geomagnetic signal. Because the static output characteristics of ordinary GMR sensor cannot meet the need of geomagnetic field measurement, static output characteristics were improved by applying high permeability materials as external flux concentrators and permanent magnet supplying magnetic bias. Numerical simulation of improved geomagnetic sensor is conducted applying ANSYS to determine related parameters of the bias magnetic field. The geomagnetic sensor is tested by non-magnetic turntable, and the result indicates that the 3D geomagnetic sensor can better describe geomagnetic signal, featuring small volume, low power consumption and high sensitivity.

关 键 词：巨磁电阻 地磁传感器 磁偏置 磁通聚集器 

分 类 号：TP212.13[自动化与计算机技术—检测技术与自动化装置]