Reduction of Environmental Magnetic Field Noise for Detection of Small Magnetic Contaminants
Reduction of Environmental Magnetic Field Noise for Detection of Small Magnetic Contaminants
复制标题
降低环境磁场噪声以检测小磁性污染物
DOI：
10.1088/1742-6596/1293/1/012054
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Takao Nishikawa and Ken Sakuta
中科院分区：
文献类型：
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作者：
Takao Nishikawa and Ken Sakuta
当通过高灵敏度磁传感器（如SQUID（超导量子干涉器件）磁强计）进行高灵敏度磁测量时，需要使用磁屏蔽盒来屏蔽环境磁噪声。但一般情况下，这种噪声的低频会降低磁屏蔽盒的屏蔽性能。因此，磁性金属污染信号与低频环境磁场噪声重叠，使得滤波成为一项具有挑战性的任务。因此，我们研究了一种抑制梯度磁噪声的系统，如叠加在污染信号上的低频环境噪声和空间局部化的商业电源噪声。
When performing high-sensitivity magnetic measurements via a high-sensitivity magnetic sensor such as a SQUID (Superconducting QUantum Interference Device) magnetometer, it is necessary to shield from environmental magnetic noise by employing a magnetic shield box. In general, however, the low frequency of such noise decreases the shielding performance of the magnetic shield box. Hence, the magnetic metallic contaminant signal and the low-frequency ambient magnetic field noise overlap, which makes filtering a challenging task. Therefore, we studied a system that suppresses gradient magnetic noise such as low-frequency environmental noise superimposed on a contaminant signal and commercial power supply noise localized spatially.