Non-bridged single electrode impedance measurement system for determining a condition of a dielectric according to impedance related changes over a range of frequencies

摘要

A method and system for analyzing the state of a dielectric material is disclosed. The dielectric material is determined to be in a state, S, by determining a similarity or dissimilarity between: (a) a first set of impedance values derived from excitation of a capacitor having the dielectric material disposed between electrodes for the capacitor, and (b) a second set of predetermined corresponding impedance values indicative of the state S. For each of a plurality of electrical frequencies, there are corresponding impedance values in the first and second sets. Each such impedance values is one of a conductance and a capacitance value for the dielectric material. Thus, within a time period sufficiently short so that the dielectric material is expected to remain in a same state throughout the time period, each of the electrical frequencies is used to excite the capacitor, and corresponding response impedance values are derived that provide an impedance “snap shot” of the dielectric material. Accordingly, a most likely state for the dielectric material is determined from a similarity or dissimilarity between the snap shot (i.e. the first set hereinabove), and the second of predetermined corresponding impedance values for the state.