This paper discusses the development of a tripolar EMG device featuring electrode impedance compensation circuitry. The device also includes circuitry to test the effectiveness of these features at improving EMG signal quality.Due to various factors, the electrode-skin impedance of different electrodes is typically imbalanced. This imbalance increases EMG susceptibility to electrical noise. These issues can be mitigated by applying impedance compensation. This was done for a tripolar configuration specifically to also reduce interference due to crosstalk.The development process and design choices behind the device features are discussed, with particular focus on the impedance compensation circuit. This includes key components used, and the justification behind their selection.To validate the effectiveness of tripolar EMG at reducing crosstalk, two additional bipolar EMG circuits were incorporated within the device. One of these had electrodes in line with the tripolar electrodes to measure the bicep, while the other was used to simultaneously measure the tricep. To validate the effectiveness of electrode impedance compensation, the impedance analyser required to measure electrode imbalance was designed to also measure compensated impedance.Testing found the tripolar electrode configuration had limited effect on crosstalk interference. Fortunately, the impedance compensation circuit could successfully correct for impedance imbalance. This lead to a marked reduction in noise due to electrical interference, such as from $50 Hz$ mains hum.

A Tripolar Electromyography Device With Active Electrode-Skin Impedance Imbalance Compensation

Paper Proceedings: https://asmedigitalcollection.asme.org/IDETC-CIE/IDETC-CIE2021/volume/85369

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