Detemple, I.I.DetempleBruns, H.H.Bruns2022-03-082022-03-082003https://publica.fraunhofer.de/handle/publica/305782The method analyses Barkhausen noise curves of multiple phase materials using the magnetic Barkhausen noise and measuring the Barkhausen noise curve at a material sample. The shape or profile of the curve is compared with several noise profile curves of calibration samples by means of a fit algorithm. The fit algorithm may be a Marquart Levenberg algorithm. A minimisation process may be used such as a simple process or combined gradients process. ADVANTAGE - Uses all information contained in curve for good adaptation capability and flexibility of use for complex testing. Can be automated and integrated in a test device. For hardened or nitrided steel, determination of diffusion and binding zones, phase analysis, morphology e.g. of martensite, cementite, and phase-specific material properties e.g. hardness, modulus, elasticity.de608620658670patent1996-19601027