目前,无屏蔽心磁测量中主要的噪声抑制技术是梯度计.通常,由于制作工艺不完美和结构不对称等原因,梯度计具有一定的不平衡性.为了提高梯度计的噪声抑制能力,需要采用磁强计进行补偿.本文基于低温超导量子干涉仪（SQUID）设计并制作了平面三轴磁强计.设计思想是通过增加磁通反馈线圈与SQUID间的互感系数,减小了三轴磁强计间的相互串扰,增加了磁强计的动态响应范围,满足城市无屏蔽环境中长时间稳定工作的要求.该平面三轴磁强计成功地应用于无屏蔽心磁图仪中,得到了高信噪比的心磁信号.
Gradiometer is widely used to suppress environmental noise in unshielded magnetocardiography（MCG）.However,the efficiency of hardware gradiometer is reduced by the imbalance caused by the imperfection of hand-wound process and the asymmetry of structure.To further suppress the noise,magnetometers are usually applied to compensate the imbalance of hardware gradiometer.We designed and developed the planar three-axis magnetometers based on the low-Tc superconducting quantum interference devices（SQUIDs）.By increasing the coupling coefficient between SQUID and its feedback coils,the dynamic range of each magnetometer fulfilled the technical demand of long-time running without overflow,and the crosstalk between the three magnetometers decreased.With the help of the planar three-axis magnetometers,MCG signal with high signal-to-noise ratio was recorded in our unshielded laboratory environment.
参考文献
| [1] | 权薇薇,陆国平,李英梅,沈越,袁鑅 |
| [2] | 李英梅,陆国平,权薇薇,杜萱,李菲卡,袁荣,沈越.心磁图对冠心病患者的诊断价值[J].中华心血管病杂志,2004(07):610-613. |
| [3] | 陈亮,蒋式勤,谢晓明.超导梯度计及其对环境噪声的抑制能力[J].功能材料与器件学报,2008(06):971-976. |
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