Yang Zhiyong, Song Junchen, Cai Wei, Lu Gaoxiang, Zhang Zhiwei
Xi'an Research Institute of High-Tech, Xi'an, 710000, Shaanxi, China.
Sci Rep. 2021 Aug 10;11(1):16242. doi: 10.1038/s41598-021-95783-0.
A solenoid magnetic field plays an important role in a non-line-of-sight azimuth transmission system based on polarization-maintaining fiber, which is directly related to the transmission accuracy of azimuth information. This research mainly studies the factors that affect the solenoid magnetic field according to the modulation signal from the direct current to the alternating current, as well as the hollow solenoid. First, the magnetic field components of the static solenoid are derived from the Biot-Savart law by using the uniform cylindrical current equivalent model. Then, the magnetic field of the near axial region is studied from the axial and radial directions, and the feasibility of calculating the magnetic field of the multi-layer solenoid with the superposition principle is verified by measuring the magnetic field of each position on the axis of the solenoid with a Gauss meter. Finally, the alternating electromagnetic field model is established using Maxwell's equations, and the magnetic and electric fields of the hollow solenoid are further solved. The results show that the magnetic field in the middle part of the magneto-optic glass is more stable, and the magnetic collecting ability of the solenoid is stronger. The magnetic field intensity at the center of the magneto-optic modulation solenoid of the system is the largest, and it decreases with the distance from the center. The alternating electromagnetic field is closely related to frequency. The results provide a reference for the study of the azimuth accuracy of a non-line-of-sight azimuth transmission system.
螺线管磁场在基于保偏光纤的非视距方位传输系统中起着重要作用，这与方位信息的传输精度直接相关。本研究主要根据从直流到交流的调制信号以及空心螺线管来研究影响螺线管磁场的因素。首先，利用均匀圆柱电流等效模型从毕奥 - 萨伐尔定律推导出静态螺线管的磁场分量。然后，从轴向和径向研究近轴区域的磁场，并通过用高斯计测量螺线管轴线上各位置的磁场来验证用叠加原理计算多层螺线管磁场的可行性。最后，利用麦克斯韦方程组建立交变电磁场模型，并进一步求解空心螺线管的磁场和电场。结果表明，磁光玻璃中部的磁场更稳定，螺线管的聚磁能力更强。系统的磁光调制螺线管中心处的磁场强度最大，且随离中心距离的增加而减小。交变电磁场与频率密切相关。研究结果为非视距方位传输系统方位精度的研究提供了参考。
