A correction method of magnetic gradient tensor system to improve magnet localization accuracy

Chen, Weiren; Zhang, Haifeng; Zhang, Xiaoqian; Lyu, Wenshan; Li, Xiaoming; Sang, Shengtian

doi:10.1016/j.sna.2024.115194

Cited by 4 publications

(1 citation statement)

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“…Over several years of development, MAD technology has gone through three stages [10]: total magnetic intensity (TMI) detection, magnetic field vector and gradient detection, and magnetic gradient tensor (MGT) detection. Compared with TMI and magnetic field vector detection, MGT detection overcomes the influence of the geomagnetic field, provides more abundant target information, and has higher resolution [11,12]. Presently, MAD technology based on MGT has attracted widespread attention.…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Parameter Optimization of Magnetic Gradient Tensor Measurement System

Liu,

Zhang,

Liu

2024

Sensors

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Magnetic anomaly detection (MAD) technology based on the magnetic gradient tensor (MGT) has broad application prospects in fields such as unexploded ordnance detection and mineral exploration. The difference approximation method currently employed in the MGT measurement system introduces measurement errors. Designing reasonable geometric structures and configuring optimal structural parameters can effectively reduce measurement errors. Based on research into differential MGT measurement, this paper proposes three simplified planar MGT measurement structures and provides the differential measurement matrix. The factors that affect the design of the baseline distance of the MGT measurement system are also theoretically analyzed. Then, using the magnetic dipole model, the error analysis of the MGT measurement structures is carried out. The results demonstrate that the planar cross-shaped structure is optimal, with the smallest measurement error, only 3.15 × 10−10 T/m. Furthermore, employing the control variable method, the impact of sensor resolution constraints, noise level, target magnetic moment, and detection distance on the design of the optimal baseline distance of the MGT measurement system is simulated and verified. The results indicate that the smaller the target magnetic moment, the farther the detection distance, the lower the magnetometer resolution, the greater the noise, and the greater the baseline distance required. These conclusions provide reference and guidance for the construction of the MGT measurement system based on triaxial magnetometers.

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Section: Introductionmentioning

confidence: 99%