Patent Number: 8,791,707

Title: Concentric coplanar capacitive sensor system with quantitative model

Abstract: A concentric coplanar capacitive sensor includes a charged central disc forming a first electrode, an outer annular ring coplanar with and outer to the charged central disc, the outer annular ring forming a second electrode, and a gap between the charged central disc and the outer annular ring. The first electrode and the second electrode may be attached to an insulative film. A method provides for determining transcapacitance between the first electrode and the second electrode and using the transcapacitance in a model that accounts for a dielectric test piece to determine inversely the properties of the dielectric test piece.

Inventors: Bowler; Nicola (Ames, IA), Chen; Tianming (Ames, IA)

Assignee: Iowa State University Research Foundation, Inc.

International Classification: G01N 27/22 (20060101); G01R 27/26 (20060101)

Expiration Date: 7/29/12018