Motion estimation of five fingers using small concentric ring electrodes for measuring surface electromyography

Recently, new interfaces for bionic arm using surface electromyography (EMG) have been developed. To control bionic arms, the motion identification of five fingers using forearm muscle is required. However, estimation of independent muscle activity on five fingers is difficult because differential electrodes between two points have low spatial selectivity. On the other hand, small concentric ring electrodes have high spatial selectivity. Therefore, in this research, we showed possibility of independent measurement of EMG corresponding to each finger´s movement using small concentric ring electrodes. Also, we compared Signal-Noise Ratio (SNR) of EMG for each finger´s using differential electrodes between two points and a virtual concentric ring electrode by an array electrode (3×3).