Journal article

Publication year: 2008

Pages: 477-484

Journal: Measurement Technology – Methods, Sensors, Systems, and Applications

Volume number: 75

Issue number: 9

ISSN: 0171-8096

DOI Link: https://doi.org/10.1524/teme.2008.0879

Publisher: De Gruyter

Abstract: 
Increasing demands in materials quality and cost effectiveness have led to advanced standards in manufacturing technology. Especially when dealing with high quality standards in conjunction with high throughput fast and quantitative NDT techniques are vital to provide reliable quality control systems. In this work we present a modern electromagnetic NDT approach using a small GMR sensor array for testing superconducting wires. Four GMR sensors are positioned around the wire. Each GMR sensor provides a field sensitivity of 200 pT/root Hz and a spatial resolution of about 100 mu m. This enables us to detect defects of 100 mu m in size in a depth of 200 mu m below surface with a signal-to-noise ratio of better than 400. Surface defects could be detected with a SNR of up to 10,000. Using this remarkably SNR and the high spatial resolution inverse algorithms were developed by both a Finite Elements Method and an analytical approach leading to defect localization with an accuracy of a few 10 mu m.

Harvard Citation style: Kreutzbruck, M., Bernau, H. and Allweins, K. (2008) High Resolution Eddy Current Testing of Superconducting Wires by Means of GMR Sensors, Measurement Technology – Methods, Sensors, Systems, and Applications, 75(9), pp. 477-484. https://doi.org/10.1524/teme.2008.0879

APA Citation style: Kreutzbruck, M., Bernau, H., & Allweins, K. (2008). High Resolution Eddy Current Testing of Superconducting Wires by Means of GMR Sensors. Measurement Technology – Methods, Sensors, Systems, and Applications. 75(9), 477-484. https://doi.org/10.1524/teme.2008.0879