Development of high-performance active magnetic shield for bio-magnetic applications

我们研制了一种主动磁屏蔽，它采用一对由非晶带材和玻璃钢复合材料制成的半圆柱形结构的磁壳。提出了一种有源补偿技术，用以消除外界的磁噪声。我们还为补偿系统研制了宽频带、高分辨率的磁传感器和低噪声功率放大器。我们应用所述屏蔽的MCG测量的SQUID系统，并首次，由6通道的磁通门传感器阵列。已经开发了一种方法，通过该方法，可以通过在开发的磁屏蔽中映射磁场来识别体模中磁性标记的累积位置。

We have developed an active magnetic shield using a pair of magnetic shells of half cylindrical structure made of amorphous tapes and FRP composite. Active compensation technique to expel magnetic noises coming from outside has beendeveloped. We have also developed a wide-band, high resolution magnetic sensor andlow-noise power amplifiers for the compensation system. We applied the said shield for the MCG measurement by a SQUID system and, for the first time, by a fluxgate sensor array of 6 channels. A method has been developed by which accumulated location of magnetic markers in a phantom can be identified by mapping magnetic fields in the developed magnetic shield.