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一种适用于地磁场补偿控制的磁场反馈电路
沈晓宇, 胡星星
中国地震局地球物理研究所
摘要:
针对现有的地磁仪器检测环节中存在的问题例如:地磁仪器的部分性能在实验室中难以测试;基于实验室测试结果而仪器在自然场运行中问题诸多的情况,一个能够实现稳定自然磁场模拟的地磁仪器测试平台至关重要。对适用于地磁场补偿控制的磁场反馈电路进行了研究,即利用反馈磁传感器测量得到的磁场和所需要的工作磁场数值进行比较作为系统的输入,经过模拟电路,将电信号传输给反馈线圈,形成闭环控制,起到补偿控制地磁场的作用。和现有的磁屏蔽方法相比,该模拟控制电路可以达到任意工作磁场的实现,而不仅限于零磁场。实验结果说明,该系统补偿10000nT的地磁场,平均误差为10.6nT,即平均补偿误差为0.106%,补偿精度高。同时系统的灵敏度高,稳定性优异。该反馈电路对地磁场可以起到很好的补偿控制作用。
关键词:  地磁场,补偿反馈,模拟电路
DOI:
分类号:
基金项目:国家重点研发计划项目课题2018YFC1503803、中国大陆综合地球物理场观测仪器研发专项项目Y201703、中央级公益性基本科研业务专项DQJB19B22
Magnetic Field Feedback Circuit for Geomagnetic Field Compensation Control
Shen Xiaoyu, Hu Xingxing
Institute of Geophysics,China Earthquake Administration
Abstract:
In the current state of geomagnetic instrument testing, some aspects of geomagnetic instrument performance are difficult to test in the laboratory. If laboratory test results are inadequate, the instrument will have multiple problems while operating in the field, where a geomagnetic instrumentation test platform with a stable natural magnetic field is critical. Here, the magnetic field feedback circuit for geomagnetic field compensation control is studied in detail. That is, the magnetic field measured by the feedback magnetic sensor and the required working magnetic field are compared as input to the system, and the electric signal is transmitted to the feedback coil through an analog circuit to form a closed loop control, which provides compensation to control the magnetic field. Compared with the existing magnetic shielding method, the analog control circuit can achieve the realization of any working magnetic field, and it is not limited to a null magnetic field. The experimental result shows that the system compensates the earth’s magnetic field of 10,000 nT with an average error of 10.6 nT and average compensation error of 0.106%, providing a high compensation accuracy. The system also shows high sensitivity and excellent stability. The feedback circuit has achieved effective compensation control for the earth’s magnetic field.
Key words:  Geomagnetic field  compensation feedback  analog circuit