利用巨磁阻效应测量地磁场水平分量
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摘要
将四个巨磁效应电阻连成单臂电桥制成传感器,使之固定于亥姆霍兹线圈中心,改变线圈上的励磁电流强度使电桥阻值发生变化,获得电桥输出电压与亥姆霍兹线圈磁感强度的线性关系。在测量系统工作状态下,使测量系统沿水平方向旋转,即改变线圈磁场与地磁场水平分量间的夹角,可观测到传感器输出电压发生变化从而测量地磁场水平分量的值。
The four giant magnetic effect resistors are connected to form a Wheatston bridge to make a magnetic sensor,fix it in the center of the Helmholtz coils.By changing the current intensity on the coils the resistance of the Wheatston bridge is changed,the linear relationship between the output voltage of the bridge and the magnetic intensity of the coil is obtained.In the working state of the measurement system,the measurement system is rotated horizontally,the angle between the magnetic field of coils and the horizontal component of geomagnetic field is changed.The change of the angle causes the output voltage of the sensor to change,and the value of the horizontal component of geomagnetic field is measured.
The four giant magnetic effect resistors are connected to form a Wheatston bridge to make a magnetic sensor,fix it in the center of the Helmholtz coils.By changing the current intensity on the coils the resistance of the Wheatston bridge is changed,the linear relationship between the output voltage of the bridge and the magnetic intensity of the coil is obtained.In the working state of the measurement system,the measurement system is rotated horizontally,the angle between the magnetic field of coils and the horizontal component of geomagnetic field is changed.The change of the angle causes the output voltage of the sensor to change,and the value of the horizontal component of geomagnetic field is measured.
引文
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[9]姚志,杨华,孙继忠.基于巨磁电阻的转速测量在实验教学中的应用[J].大学物理实验,2016,29(1):26-29.
[10]帅国彬,胡建,吕磊,等.钴基非晶丝发动机转速测量仪[J].大学物理实验,2017,30(5):21-25.
[2]孙晓洁,寇军,张笑楠,等.地磁导航技术研究进展[J].导航与控制,2016,15(6):1-6.
[3]赵维明,王明东,张加深,等.巨磁电阻效应在国防领域中的应用[J].国外电子测量技术,2009,28(7):66-68.
[4]刘全稳,王威,李臻.地球磁场起源之粒子起电问题研究[J].地学前缘,2012,19(6):260-268.
[5]查保媛,宋宁青.西宁地区地磁场水平分量的测量[J].青海大学学报,2008,26(6):97-100.
[6]刘竹琴.利用亥姆霍兹线圈测量地磁场强度及磁倾角[J].电子测量技术,2015,38(5):119-121.
[7]孙澍涛,焦成丽,任峻峰,等.分析引起地磁场观测值变化的一些因素[J].山西地震,2007,8(2):1-3.
[8]李军辉,王行舟,夏士安.安徽省地磁观测影响分析[J].地震地磁观测与研究,2008,29(6);120-125.
[9]姚志,杨华,孙继忠.基于巨磁电阻的转速测量在实验教学中的应用[J].大学物理实验,2016,29(1):26-29.
[10]帅国彬,胡建,吕磊,等.钴基非晶丝发动机转速测量仪[J].大学物理实验,2017,30(5):21-25.