Electrical properties of the skin

This work deals with the electrical properties of human skin, the possibilities of measuring its impedance, and the design of suitable electrodes for measurement. Various equivalent circuits for human skin were used, and phenomena that occur at the wet electrode-electrolyte interface, which significantly affect the measurement, were described. A description of the function of a dry planar electrode and its design for verification measurements were performed. Control measurements were performed using a EVAL-AD5933EBZ development kit in a frequency range of 5 kHz to 100 kHz at three different locations on the human body; the results were plotted in the form of the absolute value of the impedance and its phase. The accuracy of the measured values was verified by comparing the results with other works using a different electrode type. The main result of this work was to verify the possibility of using the geometry of a dry planar electrode in combination with an easily accessible evaluation board for simple diagnostic applications