PSI - Issue 50

V.N. Kostin et al. / Procedia Structural Integrity 50 (2023) 151–154

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V.N. Kostin et al./ Structural Integrity Procedia 00 (2022) 000 – 000

Fig. 3. Model setup for non-contact measurement of the magnetostriction and magnetostrictive characteristics of ferromagnetic materials by speckle-interferometry method.

During remagnetisation in Helmholtz rings (1) laser radiation illuminates the end face of the holder (8) and the reflective plate (5). The speckle-modulated waves return to the beam-splitting non-polarizing cubic prism (4) and are directed to the matrix of photodetectors of the camera (3) mounted onto adjustable camera holder with fine adjustment (7). The interference of light in the region of superimposition of two speckles is recorded by a camera (3). The interference pattern consists of two speckle fields superimposed on each other, one of which changes due to the phenomenon of magnetostriction, and the second (from the reflector) remains constant (Vladimirov et al., 2014). 4. Conclusion It has been established that the methods of laser interferometry can be used to measure the magnetostriction of bulk ferromagnets. A scheme has been developed and a model setup for non-contact measurement of the magnetostriction of ferromagnetic materials using the speckle-interferometry method has been developed. Acknowledgements The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme “Diagnostics” No. 122021000030 -1) and No. AAAA-A18-118020790148-1. References Bellesis, G. H., Harllee P.S., Renema A., Lambe D.N. Magnetostriction Measurement by Interferometry. IEEE Trans. Magn. 29(6), 1993, 2989 – 2991, DOI: 10.1109/20.281096. Kostin, V.N., Guriev M.A., Vasilenko O.N., Filatenkov D.Yu., Smorodinsky Ya.G. Amplitude-frequency characteristics of the magnetoacoustic emission of heat treated Fe-alloys. Phys. Mesomech 16, 2013, 103 – 110., DOI: 10.24411/1683-805X-2013-00058, [In Russian] Salazar, F., Bayón A., Chicharro J.M. Measurement of magnetostriction coefficient λs by speckle photography. J. Opt. Comm. 2 82, 2009, 635 – 639, DOI: 10.1016/j.optcom.2008.10.052. Samata, H., Nagata Y., Uchida T., Abe S. New optical technique for bulk magnetostriction measurement. JMMM 212, 2000, 355 – 360, DOI: 10.1016/S0304-8853(99)00832-X. Serbin, E.D., Kostin V.N., Vasilenko O.N., Ksenofontov D.G., Gerasimov E.G., Terentev P.B. Influence of the two-stage plastic deformation on the complex of the magnetoacoustic characteristics of low-carbon steel and diagnostics of its structural state. NDT & E Int 116, 2020, 102330, DOI: 10.1016/j.ndteint.2020.102330. Vladimirov, A.P. Time – average dynamic speckle interferometry. AIP Conf. Proc. 1600, 2014, 237 – 242, DOI: 10.1063/1.4879588.