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A new Barkhausen noise technique for applications at miniaturized geometries

: Hillmann, Susanne; Meyendorf, Norbert


Chimenti, D.E. ; American Society for Nondestructive Testing -ASNT-, Columbus/Ohio:
40th Annual Review of Progress in Quantitative Nondestructive Evaluation 2013. Vol.33B. Pt.1 : Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing; 40th NDE, 10th ICBM; Volume 33A and 33B; Baltimore, Maryland, USA, 21-26 July 2013
Woodbury, N.Y.: AIP, 2014 (AIP Conference Proceedings 1581)
ISBN: 978-0-7354-1213-2
ISBN: 978-0-7354-1211-8 (4-Vol. Set)
ISBN: 978-1-63266-043-5
Annual Review of Progress in Quantitative Nondestructive Evaluation <40, 2013, Baltimore/Md.>
International Conference on Barkhausen Noise and Micromagnetic Testing <10, 2013, Baltimore/Md.>
Fraunhofer IKTS ()

The magnetic Barkhausen Noise technique is a well suited method for the characterization of ferromagnetic materials. Most sensors are composed of a magnetic yoke that excites the electromagnetic field in the material, and a coil or Hall-Element, which is located between both feet of the yoke to record the Barkhausen Noise. Due to both factors, the overall size of the sensors and the spot size at the material are relatively large. For some applications, Barkhausen Noise Sensors for miniaturized samples with complex geometries are needed, for example for small mass-production components or measurements inside of boreholes. Therefore, a new design for a Barkhausen Noise sensor was developed. The principle of exciting the Magnetic Field changes from a magnetic yoke to a thin tip. The alternating current flows through the tip into the material and induces a magnetic field, which in turn generates the Barkhausen Noise. A small coil wounded around the tip, records the Barkhausen Noise signal. With this design, the contact point between sensor and material is very small and it is possible to apply the sensor to very small samples or inside boreholes.