Development and applications of fringing electric field dielectrometry sensors and parameter estimation algorithms

摘要

Recent advances in the field of interdigital w - k (frequency-wavenumber) dielectrometry are described. The paper offers an overview of several applications of this technology developed during the last few years. Interdigital w - k dielectrometry offers the ability to non-destructively measure from one side dielectric permittivity, conductivity and related physical properties distributed spatially throughout the volume of dielectric materials. A separate mapping may be required to translate the distribution of the complex dielectric permittivity into the distribution of other properties, which include moisture concentration, impurity concentration, density, porosity, thickness of films, structural integrity, surface coatings, etc. As representative examples of applications of this technology, the results of the measurement of moisture diffusion into a 1.5 mm thick oil-free transformer pressboard are presented, followed by an illustrative case of spectroscopy-based landmine detection.