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文章基于磁阻磁强计的工作原理,提出了高精度磁阻磁强计三分量探头和电子电路设计方案:改进磁强计三分量探头结构,以消除三分量磁畴间的相互干扰所引起的测量误差;采用交流耦合和闭环控制工作模式,以消除磁畴排列紊乱带来的影响,稳定磁强计的工作状态。关键性能指标的测试结果表明,磁阻磁强计在1 Hz点处的频谱噪声达到38 pT/(Hz)~(1/2),其噪声性能显著提高。另外,该磁阻磁强计采用微型化结构设计,便于安装,满足微小卫星的空间磁场探测的需求。
Based on the working principle of magnetoresistive magnetometer, a three-component high-precision magnetoresistive magnetometer and electronic circuit design scheme are proposed. The structure of the three-component magnetometer magnetometer is improved to eliminate the mutual interference between the three component magnetic domains Of the measurement error; the use of AC-coupled and closed-loop control mode of operation to eliminate the effects of disordered magnetic domain arrangement to stabilize the working state of the magnetometer. The test results of the key performance indicators show that the noise performance of the magnetoresistive magnetometer has been significantly improved when the spectral noise at 1 Hz reaches 38 pT / (Hz) ~ (1/2). In addition, the magnetoresistive magnetometer miniaturization structure design, easy to install, to meet the needs of micro-satellite space magnetic field detection.