Field tests of a new type of graphite-fiber electrode for measuring motionally induced voltages

On the basis of a field experiment in a tidal channel, comparisons have bee n undertaken between a new type of graphite-fiber electrode and conventiona l Ag/AgCl sensors for measurements of motionally induced voltages. The fibe r electrode works through polarization and is hence chemically inert, so it does not suffer from some of the electrochemical problems associated with Ag/AgCl electrodes. The graphite-fiber electrode has low noise at high freq uencies, making it suitable for detection of rapid transport changes. As a demonstration of this property, the graphite electrodes were used for turbu lence measurements.