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
- Optics and Precision Engineering
- Vol. 30, Issue 11, 1325 (2022)
Fig. 1. Structure of planar-cross MGTS
Fig. 2. Detection limits of MGTS with variable parameters
Fig. 3. Theoretical detection limits of MGTS with different sources and variable parameters
Fig. 4. Theoretical error of MGT differential measurement with different baseline distances and observation distances
Fig. 5. Experimental setup of planar-cross MGTS
Fig. 6. Prepared four magnets with size information
Fig. 7. Detection limits estimation and verification experiments
Fig. 8. Selection of cutoff frequency of low-pass filter and estimation of MGTS tensor measurement accuracy
Fig. 9. Magnets magnetic moment estimation experiments
Fig. 10. Estimated magnitude and direction of magnetic dipole moment of four magnets
Fig. 11. Detection limits estimation of MGTS for four magnets
Fig. 12. Measured MGTS detection limit distance （r max） of four magnets in direction parallel to magnetic moment
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Table 1. Estimated accuracy （maximum absolute error Q ） and precision （RMSE and ME） of MGTS readings （nT/m）
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Table 2. Estimated magnet position and magnetic dipole moment in magnet positioning experiments
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Table 3. Detection limits estimation and its necessary parameters of MGTS
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