Experimental Study of the Active Compensation to a Full-Size Separate-Shell Magnetic Shield
Experimental Study of the Active Compensation to a Full-Size Separate-Shell Magnetic Shield
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DOI：
10.1109/tmag.2010.2040469
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发表时间：
2010-05
影响因子：
2.1
通讯作者：
Y. Nakashima;Yusuke Suzuki;I. Sasada;M. Shimada;T. Takeda
中科院分区：
文献类型：
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作者：
Y. Nakashima;Yusuke Suzuki;I. Sasada;M. Shimada;T. Takeda
给出了装有有源补偿线圈的全尺寸分离壳式磁屏蔽的屏蔽效率。它的尺寸是135厘米高，100厘米宽，240厘米深。关于主动补偿，有两种控制方案，即，反馈和前馈。屏蔽效率的估计从两个轴向方向（水平和垂直）的环境磁场的衰减的测量。在反馈的情况下，测量入射磁场的参考传感器位于屏蔽内部，而在前馈的情况下，参考传感器位于壳体外部。在两个轴向方向上，环境磁噪声可以降低到小于500 pT：在10至100 Hz的频率范围内，磁通门磁力计测量的本底噪声约为10 pT/<$Hz。
Shielding efficiency of a full-size separate-shell magnetic shield equipped with active compensation coils is presented. Its size is 135 cm in height, 100 cm in width, and 240 cm in depth. With respect to active compensation two control schemes, i.e., feedback and feedforward, are compared. The shielding efficiency is estimated from the measurements of the attenuation of environmental magnetic fields in two axial directions (horizontal and vertical). In the case of feedback, a reference sensor that measures the incoming magnetic fields is positioned inside the shield, whereas in the case of feedforward the reference sensor is positioned outside the shell. In both axial directions, the environmental magnetic noise can be reduced to less than 500 pT: the noise floor measured by a fluxgate magnetometer is approximately 10 pT/¿Hz in the frequency range from 10 to 100 Hz.