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.