北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (6): 1125-1132.doi: 10.13700/j.bh.1001-5965.2019.0426

• 论文 • 上一篇    下一篇

不同速度运动汽车的磁异信号研究与探测

王尧1,2,3, 邵建达1,3, 胡国行1,3, 刘晓凤1,3, 张恺馨1,2,3   

  1. 1. 中国科学院上海光学精密机械研究所 薄膜光学实验室, 上海 201800;
    2. 中国科学院大学 材料科学与光电技术研究中心, 北京 100049;
    3. 中国科学院 强激光材料重点实验室, 上海 201800
  • 收稿日期:2019-08-01 发布日期:2020-07-02
  • 通讯作者: 胡国行 E-mail:huguohang@siom.ac.cn
  • 作者简介:王尧 男,博士研究生。主要研究方向:微型化弱磁探测技术;邵建达 男,博士,研究员,博士生导师。主要研究方向:光学薄膜、激光与材料相互作用、光学精密检测技术;胡国行 男,博士,副研究员,硕士生导师。主要研究方向:强激光与物质相互作用和微型化弱磁探测技术。

Research and detection of magnetic anomaly signals of moving vehicles at different speeds

WANG Yao1,2,3, SHAO Jianda1,3, HU Guohang1,3, LIU Xiaofeng1,3, ZHANG Kaixin1,2,3   

  1. 1. Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
    2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Key Laboratory of Materials for High Power Laser, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2019-08-01 Published:2020-07-02

摘要: 运动汽车随着速度的增加伴随着非稳态材料的产生,如汽油高温燃烧、高速摩擦引起自由电荷累积等。针对这些磁异信号难以采用适用于铁磁性材料的磁偶极子模型描述的问题,提出了结合磁偶极子模型和运动电荷等效模型的方法,理论计算不同速度运动汽车的磁异信号并分析其时域、频域特征,获得磁异信号与速度的依赖关系。采用隧道磁阻传感器(TMR)结合滤波、放大、模数转换技术构建弱磁信号探测实验装置,探测不同速度运动汽车的时域磁异信号,并采用傅里叶变换获得其频域信息,与理论模型相吻合。随着速度的增加,频域信号向高频方向偏移,对于从低频地磁背景场中提取目标弱磁信号极其重要。

关键词: 弱磁探测, 运动汽车, 磁异信号, 频谱偏移, 磁偶极子模型

Abstract: As speed increases, there is the creation of non-steady-state materials in vehicles, such as high-temperature combustion of gasoline and free charge accumulation caused by high-speed friction. These signals can not be explained by magnetic dipole model suitable to ferromagnetic materials. To solve this problem, a method combining the equivalent model of magnetic dipole and motion charge is proposed in this paper. The magnetic anomaly signals of vehicles at different speeds were calculated theoretically, their characteristics in time domain and frequency domain were analyzed, and the dependence relationship between magnetic anomaly signals and speeds was obtained. Further, a weak magnetic detection experiment device was constructed for detecting the magnetic anomaly signals of vehicles at different speeds in time domain, using the Tunnel Magnetoresistance sensor (TMR) combined with filtering, amplification and analog-digital conversion technology. The frequency-domain information was obtained using Fourier transform and the results agree with the theoretical model. In addition, the frequency-domain signal spectrum shifts to the high frequency as speed increases, which is extremely significant to extract weak magnetic target signals from low-frequency geomagnetic background field.

Key words: weak magnetic detection, moving vehicle, magnetic anomaly signal, spectral shift, magnetic dipole model

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