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Magnetic Field Feedback Circuit for Geomagnetic Field Compensation Control
SHEN Xiaoyu, HU Xingxing, HE Zhaobo
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
摘要:
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 10,000nT with an average error of 10.6nT 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.
关键词:  Geomagnetic field  Compensation feedback  Analog circuit
DOI:10.19743/j.cnki.0891-4176.201904007
分类号:
基金项目:This project is sponsored by National Key Research and Development Program Project (2018YFC1503803) and Central-Level Public Welfare Basic Research Business Special (DQJB19B22).
Magnetic Field Feedback Circuit for Geomagnetic Field Compensation Control
SHEN Xiaoyu, HU Xingxing, HE Zhaobo
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
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 10,000nT with an average error of 10.6nT 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