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Volume 2018, Article ID 3016343, 14 pages
https://doi.org/10.1155/2018/3016343
Research Article

Electromechanical Design of Self-Similar Inspired Surface Electrodes for Human-Machine Interaction

1State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
2Flexible Electronics Research Center, Huazhong University of Science and Technology, Wuhan 430074, China
3School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China

Correspondence should be addressed to YongAn Huang; nc.ude.tsuh@gnauhay

Received 20 March 2018; Revised 13 May 2018; Accepted 30 May 2018; Published 13 August 2018

Academic Editor: Zhaojie Ju

Copyright © 2018 YongAn Huang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Stable acquisition of electromyography (EMG)/electrocardiograph (ECG) signal is critical and challenging in dynamic human-machine interaction. Here, self-similar inspired configuration is presented to design surface electrodes with high mechanical adaptability (stretchability and conformability with skin) and electrical sensitivity/stability which are usually a pair of paradoxes. Mechanical and electrical coupling optimization strategies are proposed to optimize the surface electrodes with the 2nd-order self-similar serpentine configuration. It is devoted the relationship between the geometric shape parameters (height-space ratio , scale factor , and line width ), the areal coverage , and mechanical adaptability, based on which an open network-shaped electrode is designed to stably collect high signal-to-noise ratio signals. The theoretical and experimental results show that the electrodes can be stretched > 30% and conform with skin wrinkle. The interfacial strength of electrode and skin is measured by homemade peeling test experiment platform. The surface electrodes with different line widths are used to record ECG signals for validating the electrical stability. Conformability reduces background noises and motion artifacts which provides stable recording of ECG/EMG signals. Further, the thin, stretchable electrodes are mounted on the human epidermis for continuous, stable biopotential signal records which suggests the way to high-performance electrodes in human-machine interaction.