TY - JOUR
T1 - Experimental study of the active compensation to a full-size separate-shell magnetic shield
AU - Nakashima, Yoshihiro
AU - Suzuki, Yusuke
AU - Sasada, Ichiro
AU - Shimada, Masaki
AU - Takeda, Toshikazu
N1 - Funding Information:
This work was supported by the Grant-in-Aid for Scientific Research (A) and Grant-in-Aid for JSPS Fellows from Japan Society for the Promotion of Science.
PY - 2010/6
Y1 - 2010/6
N2 - 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.
AB - 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.
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U2 - 10.1109/TMAG.2010.2040469
DO - 10.1109/TMAG.2010.2040469
M3 - Article
AN - SCOPUS:77952863908
SN - 0018-9464
VL - 46
SP - 2318
EP - 2321
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 6
M1 - 5467524
ER -