Calibration and characterization of a 3D magnetic Hall sensor card

Le résumé fourni par la source

Abstract High Energy Physics experiments make use of large magnets to identify charged particles through the bending of the particle trajectories. To accurately map the field generated by such magnets, one typically employs 3D magnetic field probes, consisting of 3 individual Hall elements mounted into an orthogonal configuration. In addition to the voltage produced by the Hall effect, single-axis Hall elements are affected by parasitic effects such as offset voltage, temperature dependence, nonlinearity, and the planar Hall effect. Mechanical inaccuracies related to their physical integration also affect the final measurement accuracy. These configurations typically thus require a dedicated calibration procedure to compensate for the parasitic effects mentioned above and to enable high-precision magnetic field measurements. This article presents the mathematical model of a previously developed 3D magnetic field sensor card, introduces a novel calibration procedure designed to achieve high measurement precision, and characterizes the sensor card for use in high-energy physics experiments for mapping and monitoring applications. The characterization results demonstrate that the Hall card achieves high measurement accuracy, with a mean magnitude error of 9.15×10 -5 T and a mean angular error of 0.97 mrad over the field range of 0.1 T–2 T. This performance is consistent across temperature variations around room temperature, tested from 10 °C to 32 °C. Measurements on a total of 10 sensor cards confirm the reproducibility of both the production process and the calibration procedure.

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