A6.3 - Automated Non-Destructive Testing of Roller Bearings using GMR-Sensorarrays

Event
AMA Conferences 2013
2013-05-14 - 2013-05-16
Nürnberg
Band
Proceedings SENSOR 2013
Chapter
A6 - Magnetic Sensors I
Author(s)
M. Kreutzbruck, M. Pelkner, T. Erthner, V. Reimund - BAM Federal Institute for Materials Research and Testing, Berlin (Germany)
Pages
138 - 142
DOI
10.5162/sensor2013/A6.3
ISBN
978-3-9813484-3-9
Price
free

Abstract

Their small size together with a remarkable field sensitivity are the most prominent features of presentday GMR sensors paving the way for various applications in automated magnetic non-destructive testing (NDT). This work presents a prototype for fast and automated magnetic testing of roller bearings. A local magnetization unit excites the magnetic field inside the bearing. As a result of a design study and the following wafer fabrication the probe was equipped with NDT-adapted GMR sensor arrays, in which 48 elements measures the field response. The detection of 40 μm deep defects could be resolved with a SNR of better than 20 dB. We also report of first reconstruction results, in which the defect depth can be determined with relatively high accuracy.

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