适用于浅水区工作的三分量感应式磁场传感器研制

doi:10.11720/wtyht.2019.0123

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摘要

感应式磁场传感器广泛应用于地球物理电磁法勘探中,受物理原理制约,该类磁场传感器的噪声水平与其长度和体积成正比,长度通常为800~1 400 mm,质量在3~6 kg。本文采用一种磁通聚集技术,突破了传统感应式磁场传感器的设计瓶颈,能大幅度降低传感器的长度,研制的用于AMT方法的超小型感应式磁场传感器单个分量长度<240 mm,长度约为传统AMT磁场传感器的30%,直径<110 mm,质量约3 kg,工作频率范围为0.1 Hz~10 kHz,噪声水平在1 Hz处为0.8 pT/ $Hz$ 。将三个参数相同的磁场传感器相互垂直安装到一块底板上,构成三分量感应式磁场传感器,其体积为255 mm×255 mm×255 mm,质量约10 kg。通过安装定向器测量其倾角和方位角,并进行磁场数据校正,实现其在任何姿态下的测量数据有效;通过安装防水外罩实现其在浅水区有效工作。野外实验表明:该三分量磁场传感器既可布置在地面上,又可布置在浅水区开展AMT工作,可极大地提高野外施工效率,具有广阔的应用前景。

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	赵毅
	陈晓东
	黄跃
	王刚
	李永博
	赵富刚
	王书民

关键词 ：三分量, 感应式磁场传感器, 磁通聚集, 姿态测量, 数据校正

Abstract：

The induction magnetic field sensor is widely used in geophysical electromagnetic apparatus. Because of the physical principle, the noise level of the magnetic field sensor is proportional to its length and volume, the length is usually 800~1 400 mm, and the mass is 3~6 kg. In this study, a compact and flux concentrator was developed. The length is less than 240 mm, the diameter is 110 mm, and the mass is 3kg. Its length is approx. 30% of traditional AMT magnetic field sensors, the frequency band is from 0.1 Hz to 10 kHz, and the equivalent magnetic field noise level is 0.8 pT/ $Hz$ at 1Hz. The three magnetic field sensors with the same parameters are mounted vertically to each other on a substrate to form a three-component inductive magnetic field sensor, its volume is 255 mm×255 mm×255 mm, and the mass is 10 kg. The inclination and azimuth angle are measured by installing the directional device, and the magnetic field data correction is carried out to realize the validity of the measurement data under any attitude. Effective operation is carried out in shallow water by installing a waterproof hood. Field experiments show that the three-component magnetic field sensor can be arranged on the ground, and can be arranged in the shallow water to carry out AMT work, which greatly improves the field construction efficiency and has a broad application prospects.

Key words： three-component inductive magnetic field sensor magnetic flux aggregation attitude measurement data correction

收稿日期: 2019-03-12 出版日期: 2019-11-28

P631

基金资助:中国地质科学院基本科研业务费资助项目(YYWF201732)

作者简介: 赵毅(1969-),男,2001年毕业于中国地质大学,获硕士学位,教授级高工,现主要从事电磁法传感器研制工作。 Email: thisyz@sina.com

引用本文:

赵毅, 陈晓东, 黄跃, 王刚, 李永博, 赵富刚, 王书民. 适用于浅水区工作的三分量感应式磁场传感器研制[J]. 物探与化探, 2019, 43(6): 1326-1332.
Yi ZHAO, Xiao-Dong CHEN, Yue HUANG, Gang WANG, Yong-Bo LI, Fu-Gang ZHAO, Shu-Min WANG. The development of three-component inductive magnetic field sensor suitable for shallow water work. Geophysical and Geochemical Exploration, 2019, 43(6): 1326-1332.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0123 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I6/1326

Fig.1 磁通聚集器磁芯结构示意

Fig.2 低噪声前置放大电路图

Fig.3 三分量感应式磁场传感器外形图

Fig.4 三分量磁场传感器防水罩

Fig.5 安装了定向器的三分量磁场传感器

Fig.6 三分量坐标系定义

Fig.7 定向器角度示意图

Fig.8 三分量磁场传感器z分量灵敏度曲线(a)和噪声曲线(b)

Fig.9 地面测试视电阻率曲线对比

Fig.10 旋转测试视电阻率曲线对比

Fig.11 水下AMT测试视电阻率曲线对比

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