A pulsed magnetic field sensor based on dual-loop differential structure
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摘要: 雷击近场等强电场环境下的磁场测量是电磁脉冲测量技术中的难点之一，由于输出端结构的径向非对称性，传统的环天线很难避免电场干扰。针对于此，研制了一种基于双环差分结构的脉冲磁场传感器，该传感器由双环天线和光传输系统组成。根据近场电磁场量的分布特性，双环天线选择平行镜像对称放置的方式，从而能够将终端电压区分为磁场响应分量和电场响应分量，再通过末端差分电路即可去除电场响应分量，得到纯净的磁场响应分量。试验表明，在邻近雷击环境模拟装置中，双环传感器相较于单环传感器具备更强的抗电场干扰能力，能够实现磁场的准确测量。Abstract: Magnetic field measurement in a strong electric field environment such as a lightning strike is one of the difficulties in electromagnetic pulse measurement technology. The traditional shielded small-loop antenna introduces radial asymmetry due to the output end structure, and it is difficult to avoid electric field interference. In response to this, this paper has developed a pulsed magnetic field sensor based on a dual-loop differential structure, which is composed of a dual-loop antenna and an optical transmission system. According to the distribution electromagnetic characteristics of the near-field, the dual-loop antenna chooses to be placed in parallel mirror symmetry, so that the terminal voltage can be divided into the magnetic field response component and the electric field response component, and then the electric field response component is removed by the differential circuit to obtain the pure magnetic field response component. Experiments have shown that in the nearby lightning strike electromagnetic field environment simulator, the dual-loop sensor has stronger anti-interference capability than the single-loop sensor, and can achieve accurate magnetic field measurement.
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表 1 仿真结果
Table 1. Results of simulation
L/cm εu/% εt/% ε/% 1 10.52 2.58 13.11 3 4.63 2.20 6.83 5 3.27 1.77 4.45 7 0.78 1.51 2.29 9 0.63 1.44 2.07 
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1. 石立华. 雷电试验技术研究进展. 安全与电磁兼容. 2024(01): 9-21 . 
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