GMR Line Sensor and its Application to Eddy Current Testing

摘要

A GMR line sensor is a magnetic sensor to visualize a magnetic field distribution by only a single scan. This sensor is composed of many GMR elements in a line on a polyimide film. A [NiFeCo/Cu] multilayer type GMR element with the shape of five multi-arcs is used. Therefore, this sensor has an omni-directional magnetic sensitivity in plane. The GMR line sensor can detect a horizontal component of the magnetic field. In this paper, a change of magnetic flux in eddy current testing is detected using the GMR line sensor. The GMR line sensor can visualize the position of the slit by only a single scan, without depending on its direction.