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 been undertaken between a new type of graphite-fiber electrode and conventional Ag/AgCl sensors for measurements of motionally induced voltages. The fiber 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 frequencies, making it suitable for detection of rapid transport changes. As a demonstration of this property, the graphite electrodes were used for turbulence measurements.