Kurita Koichi
Department of Electrical Engineering and Information Science, Kochi National College of Technology, Nankoku-shi, Kochi, Japan.
Rev Sci Instrum. 2011 Feb;82(2):026105. doi: 10.1063/1.3541554.
In this study, we developed an effective nonattached, noncontact technique for measurement of the human heartbeat. This method detects the human heartbeat by measuring the current generated by variations in the capacitance between a given electrode and the human body. An electrode is placed a few centimeters from the subject's chest, and the electrostatic induction current (on the order of picoamperes) flowing through the electrode is then detected. We propose an occurrence model for the electrostatic induction current generated by variations in the electrostatic capacitance generated because of the human heartbeat, with respect to a given measurement electrode. Furthermore, we compared waveforms of the human heartbeat simultaneously obtained by using conventional electrocardiography (ECG) and our proposed electrostatic induction method. The waveform obtained using the proposed method had the same cycle as that obtained using conventional ECG. This confirms that we can detect the human heartbeat under nonattached, noncontact conditions.
在本研究中，我们开发了一种有效的非附着、非接触式测量人体心跳的技术。该方法通过测量给定电极与人体之间电容变化所产生的电流来检测人体心跳。将一个电极放置在距离受试者胸部几厘米处，然后检测流过该电极的静电感应电流（皮安量级）。我们针对给定的测量电极，提出了一个关于因人体心跳而产生的静电电容变化所产生的静电感应电流的发生模型。此外，我们比较了使用传统心电图（ECG）和我们提出的静电感应方法同时获得的人体心跳波形。使用所提出方法获得的波形与使用传统ECG获得的波形具有相同的周期。这证实了我们能够在非附着、非接触条件下检测人体心跳。
