Triboelectricity in Capacitive Biopotential Measurements

摘要

Capacitive biopotential measurements suffer from strong motion artifacts, which may result in long time periods during which a reliable measurement is not possible. This study examines contact electrification and triboelectricity as possible reasons for these artifacts and discusses local triboelectric effects on the electrode–body interface as well as global electrostatic effects as common-mode interferences. It will be shown that most probably the triboelectric effects on the electrode–body interface are the main reason for artifacts, and a reduction of artifacts can only be achieved with a proper design of the electrode–body interface. For a deeper understanding of the observed effects, a mathematical model for triboelectric effects in highly isolated capacitive biopotential measurements is presented and verified with experiments. Based on these analyses of the triboelectric effects on the electrode–body interface, different electrode designs are developed and analyzed in order to minimize artifacts due to triboelectricity on the electrode–body interface.