High Resolution Eddy Current Testing of Superconducting Wires using GMR-Sensors
In this work we present a reconstruction algorithm for a modern electromagnetic non-destructive testing approach using a small GMR sensor array to inspect superconducting wires. Four sensitive GMR sensors are positioned around the wire. Small defects of 100 |ìm in size could be detected in a depth of 200 |ìm with a signal-tonoise ratio of better than 400. Surface defects could be detected with a SNR of up to 10,000. This remarkably SNR and the small extent of GMR sensors results in a spatial resolution which offers new visualisation techniques for defect localisation, defect characterization and future tomography-like mapping techniques. We developed several inverse algorithms based on either a Finite Element Method or an analytical approach leading to defect localization with an accuracy of a few 10μm.
GMR-sensor Eddy Current Testing reconstruction superconducting wires
Marc Kreutzbruck Kai Allweins Chris Strackbein Hendrik Bernau
Federal Institute for Materials Research and Testing, 12205 Berlin, Germany Institute of Applied Physics, University of Giessen, 35390 Giessen, Germany
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
2053-2058
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）