Modeling permittivity measurement probes by using a genetic algorithm

A systematic approach is developed for modeling permitivity measurement probes. The technique was used to model a commercially available probe. This model was functionally equivalent to the provided model developed with traditional electromagnetic techniques. The approach utilizes the results of a dimensional analysis and a genetic algorithm to find an appropriate model for a probe. The only information required is uncorrected reflection-coefficient measurements on a variety of materials of known permittivity. The need to perform an electromagnetic analysis based on the geometry of a given probe and its construction is not required. This allows candidate probes that cannot easily be analyzed by traditional techniques to be considered for use.