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Current Induced Barkhausen Noise Technique

Poster presented at 13th International Conference on Barkhausen Noise and Micromagnetic Testing - ICBM 2019, Prague, September 23-26, 2019
: Birkefeld, Claudius; Hillmann, Susanne; Cikalova, Ulana; Funke, Hendrik

Poster urn:nbn:de:0011-n-5619857 (1.0 MByte PDF)
MD5 Fingerprint: 524daf330090366a2b5042c95b3e92b7
Erstellt am: 25.10.2019

2019, 1 Folie
International Conference on Barkhausen Noise and Micromagnetic Testing (ICBM) <13, 2019, Prague>
Sächsisches Staatsministeriums für Wirtschaft, Arbeit und Verkehr
EFRE-Technologieförderung 2014 bis 2020; EnBaStro 100187247
Entwicklung eines Prüfsystems auf Basis des Barkhausenrauschens mit Stromanregung
Poster, Elektronische Publikation
Fraunhofer IKTS ()
Barkhausen noise; current induced; NDE; NDT

Today Barkhausen Noise (BN) measurement is an efficient nondestructive technique for materials characterization. Usually the noise is detected by a coil while the magnetic hysteresis of the test material is cycled by an electromagnet. Due to magnetostrictive effects BN is highly sensitive to materials stresses and can be used for quantitative determination of residual stresses and external mechanical loads. The interaction of the magnetic structure (magnetic Bloch walls) with the microstructure of the material results in BN signals that are very sensitive to microstructure variations. Quantification of plastic deformation, of hardness, tensile strength, yield strength, and hardness depth are typical applications. Other innovative techniques of creating BN by electric current magnetization (Eddy field technique) (see Figure 1) opens new areas of applications for Electromagnetic Non Destructive Evaluation. When an alternating electric current is used to excite a sample by electric current noise can be detected within the noise related to the Barkhausen Effect and is sensitive to re-magnetization processes. The sensitivity of the effect to residual and applied stresses can be used to develop this technique as a principle for stress sensor technology [1]. The current BN sensors are very large and not optimal application surrounding and must be specially adapted for each kinds of different component geometries. These facts are very cost and time consuming and discourages many potential users. The Eddy field BN sensors are more compact than conventional sensors and can work in the sophisticated small samples geometries. The paper presents an idea of development of Eddy field BN sensor as well as its realization in a first prototype system. The Figure 2 shows the probe for Current Induced Barkhausen Noise Technique. Additionally the paper will shows the results of the application of this novel sensor on samples with different hardness and stress conditions.