Optics and Precision Engineering, Volume. 30, Issue 11, 1325(2022)

Estimation method for differential magnetic gradient tensor measurement limits

Qingzhu LI... Zhiyong SHI, Zhining LI* and Hongbo FAN |Show fewer author(s)
Author Affiliations
  • Department of Vehicle and Electrical Engineering, Army Engineering University of PLA, Shijiazhuang050003, China
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    Figures & Tables(15)
    Structure of planar-cross MGTS
    Detection limits of MGTS with variable parameters
    Theoretical detection limits of MGTS with different sources and variable parameters
    Theoretical error of MGT differential measurement with different baseline distances and observation distances
    Experimental setup of planar-cross MGTS
    Prepared four magnets with size information
    Detection limits estimation and verification experiments
    Selection of cutoff frequency of low-pass filter and estimation of MGTS tensor measurement accuracy
    Magnets magnetic moment estimation experiments
    Estimated magnitude and direction of magnetic dipole moment of four magnets
    Detection limits estimation of MGTS for four magnets
    Measured MGTS detection limit distance (rmax) of four magnets in direction parallel to magnetic moment
    • Table 1. Estimated accuracy (maximum absolute error Q) and precision (RMSE and ME) of MGTS readings (nT/m)

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      Table 1. Estimated accuracy (maximum absolute error Q) and precision (RMSE and ME) of MGTS readings (nT/m)

      指 标BxxBxyBxzByxByyByz估计值
      RMSE3.2190.9161.3981.5773.1262.6761.844
      ME2.6470.7201.1271.2282.5292.1351.484
      Q±8.285±3.804±4.392±5.152±8.177±6.903±8.285
    • Table 2. Estimated magnet position and magnetic dipole moment in magnet positioning experiments

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      Table 2. Estimated magnet position and magnetic dipole moment in magnet positioning experiments

      磁铁

      尺寸

      /cm

      真实位置

      /cm

      估计位置

      /cm

      估计m/

      (A·m2

      估计M/

      (A·m2

      是否有效
      m1

      ϕ2.0×

      2.0

      (50,50,-50)(66.5,67.0,-52.8)(1.68, 2.41, -6.61)7.24
      (100,100,-50)(100.0,100.3,-49.9)(0.04,0.08,-4.13)4.13
      m2

      ϕ6.0×

      1.3

      (50,50,-50)(66.9,65.1,53.0)(4.98, 2.76, -11.82)13.12
      (100,100,-50)(100.0,99.6,-50.7)(0.45, 0.36, -6.67)6.69
      m3

      6.0×

      4.0×1.0

      (50,50,-50)(69.8,62.7,-55.7)(7.74, 2.44, -15.75)17.72
      (100,100,-50)(102.7,103.6,-50.4)(-0.63, -0.81, -11.46)11.51
      m4

      10.0×

      3.0×1.0

      (50,50,-50)(64.6,67.4,-56.4)(-3.44, 10.05, -32.57)34.26
      (100,100,-50)(101.3,104.5,-50.7)(-2.84, -0.27, -22.77)22.9467
    • Table 3. Detection limits estimation and its necessary parameters of MGTS

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      Table 3. Detection limits estimation and its necessary parameters of MGTS

      d/mq/nTθ/(°)磁铁m/(A·m2M/(A·m2估计rmax/m实测rmax/m
      0.5±2.10 or 180m1(0,0.1,-4.1)4.16.25.8
      m2(0.4,0.4,-6.7)6.77.06.6
      m3(-0.6,-0.8,-11.5)11.58.07.7
      m4(-2.8,-0.3,-22.8)23.09.59.2
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    Qingzhu LI, Zhiyong SHI, Zhining LI, Hongbo FAN. Estimation method for differential magnetic gradient tensor measurement limits[J]. Optics and Precision Engineering, 2022, 30(11): 1325

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    Paper Information

    Category: Micro/Nano Technology and Fine Mechanics

    Received: Jan. 11, 2022

    Accepted: --

    Published Online: Jul. 4, 2022

    The Author Email: LI Zhining (lgdsxq@163.com)

    DOI:10.37188/OPE.20223011.1325

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