基于GPS同步的新型低温超导磁力仪

A Novel Low Temperature SQUID Magnetometer Based on GPS Synchronization

针对地球物理勘探中高精度磁场测量以及远距离数据同步的需求,本文基于低温超导量子干涉仪和图形化系统开发平台构建了一种可通过GPS同步的新型磁力仪,并可采用简便的直读方式进行磁场测量。首先介绍了新型低温超导磁力仪的工作原理,并重点阐述了由其程控直读电路以及软硬件设计方案;然后在分析影响超导磁力仪数据同步因素的基础上,给出了GPS同步实现及其同步精度标定的方法;最后在良好的磁屏蔽环境中对超导磁力仪的性能以及电磁兼容进行了评估,并对影响其同步的相关因素进行了测试和标定,试验表明传感器的本底噪声约为6 f T/Hz@1 kHz,数据同步精度可达1 ms,满足实用要求。

To meet the requirements of high precision magnetic field measurement and remote data synchronization in geophysical exploration, this paper presents a novel magnetometer based on low-temperature Superconducting QUantum Interference Device（SQUID）and graphical system development platform, which can be used to measure magnetic field in a simple direct readout way and synchronized with GPS. First of all, this paper introduces the work- ing principle and the programmable direct readout circuit of the novel SQUID magnetometer, and then focuses on its hardware and software design. Secondly, the paper gives the methods of GPS synchronization and synchronization accuracy calibration after completing the analysis of SQUID magnetometer data synchronization factors. Finally, sev- eral trials have been clone to assess the main performance and Electro Magnetic Compatibility（EMC）of the novel su- perconducting magnetometer, and calibrated related factors affecting its data synchronization. The results show that the magnetometer background noise is about 6 fT/Hz@l kHz, and its data synchronization accuracy is better than 1 μs,well positioned to meet the practical requirements.