Sensor assembly and method for determining the condition of a structure

摘要

This invention relates to a sensor assembly and a method for measuring characteristics of a finger surface, comprising a first pair of current supply electrodes coupled to a current source, providing an electrical current to the skin, at least one pickup electrodes at chosen positions relative to the current supply electrodes, at least a first of said pickup electrodes being coupled to an instrument for measuring the voltage between said first pickup electrode and at least one of the pickup or current supply electrodes.