Optimization of planar capacitive sensing for nondestructive evaluation and materials characterization

Abstract

Planar capacitive sensing is making strides as a viable nondestructive evaluation (NDE) and materials characterization technique. It relates the interaction between the fringing electric field with changes in the dielectric constant of the nearby material under test. Its single-sided, non-contact investigation capabilities, along with its high sensitivity to electromagnetic properties of materials recommend this emerging technique as an investigative option for different industrial applications. However, in order to gain acceptance among mainstream techniques, a clearer understanding of its capabilities and functionality could be achieved through further optimizations, both numerical and experimental. In this study, empirical testing and numerical simulations with respect to probe geometry and electrode size, as well as driving frequency and lift-off, in relation to test piece dielectric constant and thickness are discussed.

Authors 2

1. Lennart Bertram Aachen

   RWTH Aachen University · National Research Council Canada

   Affiliation as printed

   National Research Council Canada (Canada)

   RWTH Aachen Univ. (Germany)

2. Catalin Mandache

   National Research Council Canada

   Affiliation as printed

   National Research Council Canada (Canada)