Inspecting Printed Wiring by Using the Eddy-Current Testing Approach

Abstract

Eddy-current testing (ECT) is used for inspecting cracks in metal structures. We propose a planar-type ECT probe consisting of a meander and a mesh coil, and discuss the possibility of using ways of this probe to inspect disconnections in printed wirings. This paper describes (1) finding disconnections in printed wiring and (2) discriminating between various patterns of printed wiring and disconnections. Experimental results confirm that it is possible in principle to use ECT for inspecting printed wiring.