Bulletin of Faculty of Health Sciences Okayama University Medical School
Published by Faculty of Health Sciences Okayama University Medical School

<Formerly known as>
岡山大学医療技術短期大学部紀要 (1巻-9巻)

Modelling of interface construction relating to power-line interference phenomenon in biopotential signal measurement system

Adli 岡山大学大学院自然科学研究科
山本 尚武 岡山大学医学部保健学科放射線技術科学専攻
中村 隆夫 岡山大学医学部保健学科放射線技術科学専攻
抄録
A modelling of interface construction relating to power-line interference phenomenon was described. Source of interference was displacement currents which flowed from AC power-line configuration (APC) to a model. The interference depends on some factors: distance between the APC and a model ; length of unshielded leads ; position of the APC in vertical or horizontal direction ; and skin-electrode impedances which were balance or unbalanced. The position of APC and skin-electrode impedances were important in contributing of the interference. The interference was still large even though skin-electrode impedances were balance. This was caused by the disagreement in two displacement currents. It was overcame by adjustment of APC in vertical direction. As a result, total interference would be very small or zero. The result shows that interference in ECG signal recording can be eliminated to about 10 μV. Although interference of power-lines is a complicated phenomenon, the problem is easier to understand by using this modelling.
キーワード
AC power-line configuration (APC) (電力線配置)
biopotential signal (生体電気信号)
displacement current (変位電流)
physical model of interference (モデル)
power-line interference (誘導障害)
ISSN
1345-0948
NCID
AA11403004