An alternating current calibration method for Helmholtz coil constant based on orthogonal calculation principle

Authors

  • Kuankuan Zhang Magnetic Materials Measurement Laboratory, National Institute of Metrology, Beijing 100029, China
  • Mingxing Cao Magnetic Materials Measurement Laboratory, National Institute of Metrology, Beijing 100029, China
  • Jian He Magnetic Materials Measurement Laboratory, National Institute of Metrology, Beijing 100029, China
  • Wenjie Gong Magnetic Materials Measurement Laboratory, National Institute of Metrology, Beijing 100029, China
  • Yunhua Huang University of Science and Technology Beijing, Beijing 100083, China

DOI:

https://doi.org/10.24425/mms.2023.146415

Keywords

Helmholtz coils constant, alternating current method, induction voltage, orthogonal calculations

Abstract

The Helmholtz coil constant (𝑘ℎ) is a crucial standard in magnetic moment measurement devices for permanent magnet materials. To overcome the problem of low accuracy of the direct-current (DC) calibration method, this study used a constant sinusoidal current in the Helmholtz coil and measured the induced voltage of the detection coil with known coil turns and coil area. Subsequently, the 𝑘ℎ was calculated. The noise signal deduction rate in the induction voltage of the detection coil was greater than 99%, its influence on the induction voltage is less than 0.005%, and the repeatability of the calibration results is 0.003% (1𝛿). The results reveal that the alternating current (AC) method and orthogonal calculation (OC) can accurately measure the valid values of the voltage signal under the influence of the spatial stray field during the calibration of 𝑘ℎ.

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Published

2023-09-30

How to Cite

Zhang, Kuankuan, et al. “An Alternating Current Calibration Method for Helmholtz Coil Constant Based on Orthogonal Calculation Principle”. Metrology and Measurement Systems, vol. 30, no. 3, Sept. 2023, pp. 549-61, doi:10.24425/mms.2023.146415.

Issue

Vol. 30 No. 3 (2023)

Section

Articles