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

doi:10.1088/1674-1056/21/4/040702

Abstract 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.

Keywords: electromagnetic interference leakage current subways magnetocardiography

Received: 28 November 2010
Revised: 17 May 2011
Accepted manuscript online:

PACS:	07.55.Ge	(Magnetometers for magnetic field measurements)
	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))
	52.70.Ds	(Electric and magnetic measurements)
	87.85.Ng	(Biological signal processing)

Fund: Project supported by the State Key Development Program for Basic Research of China(Grant Nos.2006CB601007 and2011CBA00106),the National Natural Science Foundation of China(Grant No.10674006),and the National High TechnologyResearch and Development Program of China(Grant Nos.2007AA03Z238 and 2007AA03Z213)

Corresponding Authors: Ma Ping, E-mail:maping@pku.edu.cn
E-mail: maping@pku.edu.cn

Cite this article:

Gu Hong-Fang (谷红芳),Cai Wen-Yan (蔡文艳),Wei Yu-Ke (魏玉科),Liu Zheng-Hao (刘政豪),Wang Qian (王倩),Wang Yue (王越),Dai Yuan-Dong (戴远东),Ma Ping (马平) Measurements, characteristics, and origin of new electromagnetic interference on magnetocardiographic measurements 2012 Chin. Phys. B 21 040702

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

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