scholarly journals LADRC-Based Magnetic Field Measurement Method for a Nuclear Magnetic Resonance Rotation Sensor

2021 ◽  
Vol 11 (21) ◽  
pp. 10458
Author(s):  
Xinghua Zhao ◽  
Zhanchao Liu ◽  
Xinda Song ◽  
Jianli Li ◽  
Yibo Shao
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Measurement ◽  
Magnetic Field Measurement ◽  
Loop Control ◽  
Rotation Sensor ◽  
Resonance Rotation ◽  
Phase Loop ◽  
Nuclear Magnetic

Magnetic field measurement is fundamental to nuclear magnetic resonance rotation sensors (NMRRS). A phase-locked loop (PLL)-based measurement with two nuclear isotopes is commonly applied to observe the magnetic field. However, the phase-loop and frequency-loop of the nuclear isotopes cannot be optimized simultaneously by a PLL-based method. In this paper, an approach based on a linear active disturbance rejection controller (LADRC) is proposed for synchronous phase-loop control of the two nuclear isotopes. Meanwhile, the frequencies of the nuclear isotopes are observed by linear extended state observers (LESOs). The phase and frequency loops can be decoupled and optimized with the proposed method. An experimental NMRRS prototype used for verification is built. The effectiveness and the feasibility of the proposed method are validated with the experimental results.

Diamagnetization in the Vortex State of Bi(Pb)-Sr-Ca-Cu-O: Magnetic Field Measurement at the Surface by Nuclear Magnetic Resonance

1991 ◽  
Vol 30 (Part 2, No. 4A) ◽  
pp. L572-L575 ◽  
Author(s):  
Yutaka Maniwa ◽  
Hiroshi Sato ◽  
Taku Mituhashi ◽  
Kenji Mizoguchi ◽  
Ikuyo Shiozaki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Measurement ◽  
Vortex State ◽  
Magnetic Field Measurement ◽  
Nuclear Magnetic
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