Characterization and Implementation of a GMR based probe for Eddy Current Testing

摘要

The aim of this paper is to describe an eddy current nondestructive testing system employing Giant Magnetoresistive (GMR) sensors. GMR sensors are solid state devices capable of measuring magnetic flux density. The use of GMR sensors in the framework of eddy current testing is motivated by their intrinsically high sensitivity, large bandwidth and low cost. This paper is specifically focused on the development of a GMR based probe integrated into an eddy current testing system for detecting the presence of millimetre size cracks in highly conductive materials such as Aluminium.