Measurements, characteristics, and origin of new electromagnetic interference on magnetocardiographic measurements

被引：10

作者：

Gu Hong-Fang ^{[1
]}

Cal Wen-Yan ^{[1
]}

Wei Yu-Ke ^{[1
]}

Liu Zheng-Hao ^{[1
]}

Wang Qian ^{[1
]}

Wang Yue ^{[1
]}

Dai Yuan-Dong ^{[1
]}

Ma Ping ^{[1
]}

机构：

[1] Peking Univ, State Key Lab Artificial Microstruct & Mesoscop P, Dept Phys, Appl Superconduct Res Ctr, Beijing 100871, Peoples R China

来源：

CHINESE PHYSICS B | 2012年 / 21卷 / 04期

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

electromagnetic interference; leakage current; subways; magnetocardiography; NONDESTRUCTIVE EVALUATION; SQUID;

D O I：

10.1088/1674-1056/21/4/040702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In order to eliminate the influence of the large-amplitude magnetic field noise that has complicated magnetocardiographic studies since October 2009, we have performed high-accuracy measurement of the environmental magnetic field noise in the vicinity of Beijing Subway Line 4 using a three-component height T-c radio frequency (rf) superconducting quantum interference device (SQUID). By analysing the spatial form and other characteristics of the time and the frequency domains and by calculating the circumferential magnetic field distribution based on a duel-end feeding system model, we reach the following conclusions: (i) the main source of magnetic field noise is the magnetic field generated by the subway trains, and (ii) the magnetic field interference results mainly from the imbalance between traction current and return rail current that is caused by the leakage current.

引用

页数：8

共 12 条

[1] MAGNETOCARDIOGRAMS TAKEN INSIDE A SHIELDED ROOM WITH A SUPERCONDUCTING POINT-CONTACT MAGNETOMETER [J].