Utilization of SV-GMR Sensor for Detection Conductive Microbead with Helmholtz Coil Exciter Based on Eddy Current Testing

This paper presents the utilization of spin-valve giant magnetoresistance (SV-GMR) as a sensor and Helmholtz coil as an exciter for detection of both single and array conductive microbead based on eddy current testing (ECT) technique. The magnetic field distribution of the proposed ECT probe was calculated by finite element method (FEM). The experiment was performed to detect a single and array conductive microbead. The results enabled us to determine the position and achieve good level of signals.Special Issue of the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM06