Research on Metrology Techniques for Strong Magnetic Fields Using the Magnetic Flux Modulation Method

ZHANG Yubo; LI Zhun; LU Yunfeng; HE Qing

doi:10.12338/j.issn.2096-9015.2023.0138

Volume 67 Issue 6

Jun. 2023

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ZHANG Yubo, LI Zhun, LU Yunfeng, HE Qing. Research on Metrology Techniques for Strong Magnetic Fields Using the Magnetic Flux Modulation Method[J]. Metrology Science and Technology, 2023, 67(6): 22-28, 62. doi: 10.12338/j.issn.2096-9015.2023.0138

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ZHANG Yubo, LI Zhun, LU Yunfeng, HE Qing. Research on Metrology Techniques for Strong Magnetic Fields Using the Magnetic Flux Modulation Method[J]. Metrology Science and Technology, 2023, 67(6): 22-28, 62. doi: 10.12338/j.issn.2096-9015.2023.0138

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Research on Metrology Techniques for Strong Magnetic Fields Using the Magnetic Flux Modulation Method

doi: 10.12338/j.issn.2096-9015.2023.0138

ZHANG Yubo^1
,,
LI Zhun^{1
,
,},
LU Yunfeng^{1, 2},
HE Qing^{1, 2}

1.
National Institute of Metrology, Beijing 100029, China
2.
Key Laboratory of Electrical Quantum Standards for State Market Regulation, Beijing 100029, China

Received Date: 2023-05-18
Accepted Date: 2023-05-26
Rev Recd Date: 2023-06-19

Available Online: 2023-07-28

Publish Date: 2023-06-18

Abstract

Abstract

Stable, strong magnetic fields are instrumental in scientific research, biomedicine, and material science. Addressing the challenges in measuring and tracing super-strong magnetic fields, we introduce a measurement method derived from the magnetic flux modulation principle, leading to the development of a highly stable magnetic field measuring instrument. By employing a refined signal conditioning circuit and harnessing the phase-locking principle to achieve optimal signal-to-noise ratio, we deduce the induced electromotive force corresponding to the magnetic induction intensity of the inspected strong magnetic field. Calibration of the instrument's coil constant with a standard magnetic field allows the constant to serve as a transfer standard, facilitating ultra-strong magnetic field measurements and calibrations. We examined superconducting strong magnetic fields within the 1-7 T range, providing an in-depth analysis and evaluation of the measuring device and coil constant. Our findings highlight that the measurement bias for the 1-7 T magnetic field is better than 0.083%. The relative uncertainty introduced by our instrument is up to 3×10⁻⁴, marking a significant advancement for ultra-strong magnetic field measurements.
- metrology,
- strong magnetic field,
- magnetic flux modulation,
- coil,
- lock-in amplifier,
- uncertainty

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References(34)

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