宇航计测技术 ›› 2021, Vol. 41 ›› Issue (1): 33-37.doi: 10.12060/j.issn.1000-7202.2021.01.06

• 量值传递技术 • 上一篇    下一篇

低频三维磁场测量系统研制

李祥麟1；吴静1；金海彬2；李怡濛1   

  1. 1.北京航空航天大学，北京 100191；
    2.北京东方计量测试研究所，北京 100086
  • 出版日期:2021-02-25 发布日期:2022-03-07
  • 作者简介:李祥麟（1997.12-），男，在读硕士，主要研究方向：电磁检测技术。
  • 基金资助:
    国家自然科学基金项目（51777006）资助。

Development of Low-frequency Three-dimensional Magnetic Field Measurement System

LI Xiang-lin1；WU Jing1；JIN Hai-bin2；LI Yi-meng1   

  1. 1.Beihang University,Beijing 100191,China; 2.Beijing Orient Institute of Measurement and Test,Beijing 100086,China
  • Online:2021-02-25 Published:2022-03-07

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摘要： 低频10Hz～20kHz的电磁波在气象观测、地质勘探、远距通信等领域具有广泛应用。为了监测该频段的电磁辐射，本文设计了三轴正交方形天线用于测量低频磁场，采用基于AD797与OP27的双级放大电路对磁场感应电压信号进行调理和放大，采用NI-9222数据采集卡实现对信号波形进行采集，利用短时傅里叶变换对信号进行时频分析。所研制的测量系统可测量0.15pT～340nT的时变磁场，电路仿真和实际测试结果表明系统具有良好的幅频特性，能够有效监测出电网变电站附近的弱低频电磁辐射。

关键词: 超低频辐射, 磁感应传感器, 信号处理, 三维磁场测量

Abstract: Electromagnetic waves in the range of 10 Hz to 20 kHz are widely used in meteorological observation,geological exploration,long-distance communication and other fields.In order to monitor the electromagnetic radiations in this band,a three-axis orthogonal loop antenna is designed.A two-stage amplifier circuit based on AD797 and OP27 is used to condition and amplify the voltage signal of induction coil.The NI-9222 data acquisition card is used to acquire magnetic field signal,and the short-time Fourier transform is used to analyze the time-frequency characteristics of the signal.The developed system can measure time-varying magnetic field of 0.15 pT~340 nT.The circuit simulation and practical test results show that the system has a good amplitude-frequency characteristic and can effectively monitor the weak low-frequency electromagnetic radiations near the power substation.

Key words: Ultra-low frequency radiation, Magnetic induction sensor, Signal processing, Three-dimensional magnetic field measurement

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