SONG Shuang, SUN De-li, CHEN Chao, TENG Fei
（College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China）
Abstract： Magnetometric resistivity (MMR) method is a new way to detect dam leakage. The coil sensor is generally used to collect data in geophysical exploration methods. Given the characteristics of accurate vector data requirements and high sensitivity requirement, a three-component MMR air-core coil sensor is designed. Through the analysis of sensor sensitivity and coil structure parameters, the coil structure and turn number are designed. By analyzing the noise source of the sensor, a suitable amplifier is selected to reduce the background noise of the system. Through the analysis of the three-component non-orthogonal angles, the parameters of the non-orthogonal angles of the coils are corrected. Finally, a three-component MMR induction magnetic field sensor is designed. The volume of the sensor is controlled at 0.027 m3. The background noise of X、Y and Z are 5.030 435 nV/Hz@380 Hz and magnetic field sensitivities are 0.189 95 pT/Hz@380 Hz. The three channels have good consistency, and the three-component nonorthogonal angles correction error of three components is controlled within 0.2%.
Key words： magnetometric resistivity (MMR); three-component air-core coil sensor; noise analysis; high sensitivity; three-component correction
CLD number： TP212.1+3 doi： 10.3969/j.issn.1674-8042.2020.01.006
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用于磁电阻率探测的矢量线圈传感器设计与优化
宋 爽， 孙德立， 陈 超， 滕 飞
（吉林大学 仪器科学与电气工程学院， 吉林 长春 130061）
摘 要： 磁电阻率（MMR）探测方法作为一种新型的堤坝渗漏探测方法， 采集数据时主要依靠线圈传感器， 针对MMR信号对要求灵敏度高， 需要精准矢量采集的特点， 本文设计了一款三分量MMR空心线圈传感器。通过对传感器灵敏度与线圈结构参数的分析， 对线圈的结构、匝数进行了设计；通过对传感器噪声源分析， 选定了适宜的放大器， 进一步降低了系统的本底噪声；通过对三分量不正交角度的分析， 对线圈的不正交角度进行了参数校正。 最终研制了一款三分量MMR线圈传感器。 其体积控制在0.027 m3， X、Y、Z三分量本底噪声为5.030 435 nV/Hz@380 Hz， 三通道的磁场探测灵敏度为0.189 95 pT/Hz@380 Hz， 三通道一致性良好， 三分量校正误差控制在0.2%以内。
关键词： 磁电阻率； 三分量线圈传感器； 噪声分析； 高灵敏度； 三分量校正
引用格式： SONG Shuang, SUN De-li, CHEN Chao, et al. Design and optimization of vector coil sensor suited to magnetometric resistivity method. Journal of Measurement Science and Instrumentation, 2020, 11（1）： 45-53. ［doi： 10.3969／j.issn.1674-8042.2020.01.006］
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