Application of GMR Line Sensor to Eddy Current Testing Probe

Abstract

A GMR line sensor is a magnetic sensor for visualizing a magnetic field distribution using only a single scan. This sensor is composed of many GMR elements on a line of polyimide file. A multilayer NiFeCo/Cu GMR element with the shape of five multi-arcs is used. Therefore, this sensor has an omnidirectional magnetic sensitivity in plane. The GMR line sensor can detect a horizontal element of the magnetic field. This paper discusses detection of a change of magnetic flux in eddy current testing, using the GMR line sensor. The GMR line sensor can visualize the position of the slit in only a single scan, without depending on its direction.