Patent ID: 8791707
Filing Date: 2014-07-29
Classification: G01N

Abstract:
1. A concentric coplanar capacitive sensor system, comprising: a concentric coplanar capacitive sensor comprising (a) a charged central disc forming a first electrode, (b) an outer annular ring coplanar with and outer to the charged central disc, the outer annular ring forming a second electrode, (c) a gap between the charged central disc and the outer annular ring, and (d) the first electrode and the second electrode attached to an insulative film; a capacitance measuring circuit electrically connected to the concentric coplanar capacitive sensor for measuring transcapacitance between the first electrode and the second electrode for use in evaluating a dielectric test piece; a processor operatively connected to the first electrode, the processor configured to use the transcapacitance as an input to a quantitative model of the dielectric test piece to determine inversely properties of the dielectric test piece; wherein the quantitative model provides a quantitative relationship between a transcapacitance measured with the concentric coplanar capacitive sensor and permittivity and thickness of each of a plurality of layers in the dielectric test piece.