Peng Shun, Bao Shenjie, Chen Wei
Annu Int Conf IEEE Eng Med Biol Soc. 2019 Jul;2019:6587-6590. doi: 10.1109/EMBC.2019.8856885.
A non-contact electrocardiograph (ECG) measurement system based on capacitive coupled electrodes is proposed. Unlike conventional wet electrode, the capacitive coupled electrode is designed to measure ECG signal both in contact with skin and through clothes. The hardware part of the system includes two capacitive coupled electrodes, a reference electrode, a signal processing module and a transmission module, and the software part includes data extraction, signal processing, data storage, and waveform display. A real-time ECG denoising algorithm is developed based on wavelet transform with a moving window. To verify the performance of proposed system, two different conditions of the ECG measurement are experimentally tested in comparison with Ag/AgCl electrode. One is in a contact condition in which capacitive coupled electrodes touched the skin. Another is the non-contact condition in which ECG was measured through thin clothes. The results show that the capacitive coupled electrode is better than the conventional Ag/AgCl electrode when it is attached to the skin, and the clear ECG waveform can be obtained under non-contact measurement. The results demonstrated the feasibility to measure high resolution ECG waveform with real-time denoising algorithm in a non-contact way.
提出了一种基于电容耦合电极的非接触式心电图（ECG）测量系统。与传统的湿电极不同，电容耦合电极设计用于在与皮肤接触以及透过衣服的情况下测量ECG信号。该系统的硬件部分包括两个电容耦合电极、一个参考电极、一个信号处理模块和一个传输模块，软件部分包括数据提取、信号处理、数据存储和波形显示。基于带移动窗口的小波变换开发了一种实时ECG去噪算法。为了验证所提出系统的性能，与Ag/AgCl电极相比，对两种不同的ECG测量条件进行了实验测试。一种是电容耦合电极接触皮肤的接触条件。另一种是非接触条件，即透过薄衣服测量ECG。结果表明，电容耦合电极附着在皮肤上时比传统的Ag/AgCl电极更好，并且在非接触测量下可以获得清晰的ECG波形。结果证明了以非接触方式使用实时去噪算法测量高分辨率ECG波形的可行性。
