便携式三分量磁场测量模块

doi:10.11720/wtyht.2022.1463

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摘要

高精度磁场测量模块主要用于地质、地球物理、国防等科学领域。现有的三分量磁场测量模块存在便携性差(需要连接PC交互)、本底噪声水平高、续航时间短等不足。针对现有磁场测量模块的不足,对便携式三分量磁场测量模块进行研发,研制了高精度数据模块,开发了Android手机端控制程序,并进行了性能指标测试。测量模块支持Android手机端交互,具有本底噪声水平低(动态范围>121dB@fs=1 000 Hz)、同步精度高(时间漂移±0.87 ms/day)、续航时间长(可连续工作一周)、扩展性强(支持多种磁通门传感器)的特点。便携式三分量磁场测量模块设计便携、简单易用,适合野外测试使用。

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	王旭
	陈凯
	芦勇健
	尹曜田

关键词 ：低功耗, 低噪声, 时钟同步

Abstract：

The high-precision magnetic field measurement module is mainly used in the scientific fields such as geology, geophysics, and national defense. However, the existing three-component magnetic field measurement module suffers poor portability (requiring a PC for data acquisition), large background noise, and short operating time. Therefore, this study developed a portable three-component magnetic field measurement module:a high-precision data measurement module and an Android control program. The test results show that the measurement module supports the interactive control using Android mobile phones and enjoys the advantages of low background noise (dynamic range>121dB@fs=1,000Hz), high clock synchronization precision (time drift±0.87 ms/day), long operating time (for one-week continuous work), and high scalability (supporting multiple fluxgate sensors).Portable three-component magnetic field mesurement module is portable,simpk and easy to use,suitable for field testing.

Key words： low power consumption low noise clock synchronization

收稿日期: 2021-08-20 修回日期: 2022-06-12 出版日期: 2022-12-20

ZTFLH:

P631

基金资助:国家自然科学基金项目“海底MT的运动海水电磁噪声分离方法研究”(41804071)

通讯作者: 尹曜田

作者简介: 王旭(1998-),男,主要从事地球物理仪器开发及应用工作。Email:3466604515@qq.com

引用本文:

王旭, 陈凯, 芦勇健, 尹曜田. 便携式三分量磁场测量模块[J]. 物探与化探, 2022, 46(6): 1528-1533.
WANG Xu, CHEN Kai, LU Yong-Jian, YIN Yao-Tian. Portable three-component magnetic field measurement module. Geophysical and Geochemical Exploration, 2022, 46(6): 1528-1533.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1463 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I6/1528

Fig.1 MagDAS-03组成部件

参数	测量范围
-3dB带宽	DC~3k Hz
噪声	<4 pT/ $H z$ @1Hz
功耗	1140 mW(+65 mA@12V, -30 mA@-12V)
量程	±60~±1000 μT
线性度	15 ppm
体积	32(L)mm×32(W)mm×225(H)mm

Table 1 Mag-13磁通门传感器参数

Fig.2 硬件原理框

Table 2 ADS1282参数

Fig.3 MagDAS-03电源拓扑结构

Fig.4 时钟同步原理

Fig.5 MCU程序框图

Fig.6 软件主界面(a)状态查询(b)设置界面(c)

Fig.7 软件控制界面(a)数值显示(b)波形显示(c)

Fig.8 噪声时域波形

Table 3 本底噪声有效值及动态范围

Fig.9 本底噪声功率谱密度

Table 4 MagDAS-03功耗测试

Fig.10 MagDAS-03带宽测试

Table 5 Spectramag-6和MagDAS-03性能对比

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