An Optimized Measurement Method for Magnetic Properties of Permalloy Sheet under Demagnetization

• Published in: IEEE transactions on instrumentation and measurement Vol. 71; p. 1
• Main Authors: Shi, Minxia, Zhang, Xu, Yang, Jianzhi, Yuan, Shuai, Wang, Ling
• Format: Journal Article
• Language: English
• Published: New York IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Coils; Control systems design; Demagnetization; Excitation; Feedback control; Ferrous alloys; Finite element method; Magnetic alloys; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetic properties; Magnetic shielding; Measurement methods; Permalloy sheet; Remanence; Saturation magnetization; Testing; Waveforms
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2022.3185326

Generally, a permalloy sheet is applied as the major shielding material for weakening the environmental magnetic field interference in a field of high-precision measurement. The demagnetization for a permalloy sheet determines its shielding performance; therefore, an enhanced method for measuring the magnetic properties under degaussing excitation is proposed in this paper. The excitation apparatus and a feedback control system are designed for regulating the B curve of a permalloy sheet as the desired amplitude and waveform. Furthermore, a method for applying degaussing excitation is proposed and the corresponding measurement approach under such magnetic conditions is investigated. Finally, the dynamic Jiles-Atherton model is combined with a finite element method (FEM) algorithm for applying the tested data to the residual magnetic field calculation of a scaled-down model. The agreement between the calculated and tested remanence distribution indicates that the proposed measurement method is reliable and applicable.