Calibration of magnetic gradient tensor measurement array in magnetic anomaly detection

Jinfei Chen; Qi Zhang; Mengchun Pan; Feibing Weng; Dixiang Chen; Hongfeng Pang

doi:10.1117/12.2014424

31 January 2013 Calibration of magnetic gradient tensor measurement array in magnetic anomaly detection

Jinfei Chen, Qi Zhang, Mengchun Pan, Feibing Weng, Dixiang Chen, Hongfeng Pang

Proceedings Volume 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation; 875947 (2013) https://doi.org/10.1117/12.2014424
Event: International Symposium on Precision Engineering Measurement and Instrumentation 2012, 2012, Chengdu, China

Abstract

Magnetic anomaly detection based on magnetic gradient tensor has become more and more important in civil and military applications. Compared with methods based on magnetic total field or components measurement, magnetic gradient tensor has some unique advantages. Usually, a magnetic gradient tensor measurement array is constituted by four three-axis magnetometers. The prominent problem of magnetic gradient tensor measurement array is the misalignment of sensors. In order to measure the magnetic gradient tensor accurately, it is quite essential to calibrate the measurement array. The calibration method, which is proposed in this paper, is divided into two steps. In the first step, each sensor of the measurement array should be calibrated, whose error is mainly caused by constant biases, scale factor deviations and nonorthogonality of sensor axes. The error of measurement array is mainly caused by the misalignment of sensors, so that triplets’ deviation in sensors array coordinates is calibrated in the second step. In order to verify the effectiveness of the proposed method, simulation was taken and the result shows that the proposed method improves the measurement accuracy of magnetic gradient tensor greatly.

Citation Download Citation

Jinfei Chen, Qi Zhang, Mengchun Pan, Feibing Weng, Dixiang Chen, and Hongfeng Pang "Calibration of magnetic gradient tensor measurement array in magnetic anomaly detection", Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 875947 (31 January 2013); https://doi.org/10.1117/12.2014424

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