Performance of Digital SQUID Gradiometer for MCG Measurement Under Different Shielding Conditions in a Variety of Noisy Environments
Performance of Digital SQUID Gradiometer for MCG Measurement Under Different Shielding Conditions in a Variety of Noisy Environments
复制标题
各种噪声环境中不同屏蔽条件下用于 MCG 测量的数字 SQUID 梯度仪的性能
DOI：
10.1109/tasc.2009.2018194
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发表时间：
2009
影响因子：
1.8
通讯作者：
P. Ma
中科院分区：
文献类型：
--
作者：
J. Jiao;Xun Wang;Wei Wang;Ling Tong;Ji Gao;P. Ma
在这项工作中，使用两个HTS YBCO rf SQUID组成梯度计，无需电子减法，并应用数字数据处理来消除环境噪声。以健康志愿者为测量对象，在不同噪声成分和特性的环境中，在不同屏蔽条件下，获得了不同信噪比SNR的心磁图记录。为了提取信号，研究了基于自适应滤波、小波变换和独立分量分析的数据处理方法，分别提高了各次测量的信噪比。这些数值方法的性能进行评估和比较。结果表明，采用适当的数据处理方法，可以在噪声较大、屏蔽较弱的环境中获得满意的信号质量。
In this work, two HTS YBCO rf SQUIDs are used to form a gradiometer without electronic subtraction and digital data processing is applied to cancel the environmental noise. With healthy volunteers as measuring subjects, MCG recordings of various signal-to-noise-ratio SNR are obtained under different shielding conditions in environments of different noise components and characteristics. To extract the signal, data processing procedures based on adaptive filtering, wavelet transform and independent component analysis are studied and utilized to raise the SNR in each measurement respectively. The performances of these numerical methods are evaluated and compared. The result shows that using appropriate data processing methods one can get acceptable signal quality in comparatively more noisy environment with weak shielding.